July 2012 california stormwater bmp handbook 5 of 5. Rock slope protection should be class ii method b placement per revised section 72 of the state standard specifications placed along the newly regraded. Construction methods for bank and bottom protection on. Size the sizes of stones used for riprap protection are determined by purpose and specific site conditions. Costeffective and sustainable road slope stabilization and. The preproduction verification test nail location will identify the first nail sacrificial to be tested to confirm the assumptions of.
Rock slope protection fabric installation shall conform to section 72, slope protection of caltrans standard specifications except as amended herein. Deep slope erosion control and embankment stabilization. The gradation required for rock lined chutes is determined differently. The changes in the design procedure are those that remove references to allowable velocity procedures and replace them with tractive stress evaluations. Slope stabilization riprap stone for slope stabilization not subject to flowing water or wave action should be sized for the proposed grade.
Recommendations presented in this manual are based on research presented in shakoor. For rsp classes i thru viii, use class 8 rspfabric which has lower weight per unit area and it also has lower toughness tensile x elongation, both at break than class 10 rspfabric. Angular shapes may be used on any planed slope durability. Wovens, nonwovens, high performance, monofilaments, landscape fabricsyou name it. Concrete canvas is increasingly being used as an alternative to sprayed concrete solutions to protect slopes, embankments and cuttings from surface erosion. Finite slope if the backfill slope changes to horizontal within the limits of the active wedge of failure, the slope may be analyzed in two ways. Hydraulic design of energy dissipators for culverts and channels. The caltrans specification contains errors and contradictions, so please read the many notes below the product chart. To see additional information for a contract, click on that contract number. Geotechnical manual 24 txdot 032018 chapter 2 soil surveys section 1 soil surveys if boring information varies significantly from one side of the channel to the other, a boring in the. An introduction to slope stability and protection j. Unlike traditional methods, cc generates no rebound, reduces the need for line or lane possession and can be installed around sensitive infrastructure. Field survey of weak rock slopes along the national south2 freeway conducted in this study showed that the slope protection methods employed in the study areas mainly included vegetation 82.
Rock slope protection rsp is among various bank and shore protection materials and methods. Before, state route 150 was continuosly subjected to flooding, erosion and closures during storm events. Bank and shore cabs rock slope protection design methodology replaced by. The report clarifies the procedure of the california bank and shore cabs layered rock slope protection rsp design method. Any person or group who violates any condition of the swppp may be subject to substantial penalties or loss of contract. Statefurnished materials and expenses, as well as supplemental work items and descriptions. Caltrans method face of slope revetment no steeper than 1. Nchrp report 568 riprap design criteria, recommended. Must be placed to the level of original ground or finished grade shown if you excavate outside the designated pay limits, material placed in those excavation areas must comply. Modem methods for design and stabilization of rock slopes were developed in the 1970s. Footings for slope protection, slope paving, and aprons 3.
Caltrans, chief, office of geotechnical design north. Aashto standard specifications for transportation materials and methods of sampling and. Rock that is dumped into place method b placement must be larger than rock placed by method a, which required a three point bearing placement. The gradient of the slope to be stabilized should be less.
Although the rock shown is of differing quality, the entire length of the 90 cidh is deemed a rock socket. The city of napa standard specifications and standard plans city standards is a document that provides a summary and guide to key elements of the regulations and policies governing the design and construction of public improvements within the city of napa. Paul guyer is a registered mechanical engineer, civil engineer, fire protection engineer and architect with over 35 years experience in the design of buildings and related infrastructure. Caltrans geotechnical manual california department of. Standard contract items and descriptions for caltrans projects. Also refer to the standard specifications section 72 for rsp rock class. Engineering references for bank and slope protection in general include california highways 1970, brown and clyde 1989, usace 1991, caltrans 1996 and escarameia 1998. This broad definition encompasses many and varied applications. Select rock so that shapes provide a stable structure for the required section. Failures of weak rock slopes adjacent to roadsides in southwestern taiwan most often occurred during or immediately after heavy rainfall. Performing organization name and address 2963 ash street denver. Retaining walls, except for portions under any surfacing 5. Enter the item description of the code you wish to search for.
Maintain safe operation of the transportation facility and to protect the traveling. Select the method to remove and control water at excavations where seal courses are not shown. Slope stability analysis geotechnical design manual m 4603 chapter 74 december 2006 slope stability analysis detailed assessment of the groundwater regime within and beneath the slope is also critical. Adjusted prices are adjusted to todays dollars based on the caltrans construction cost index. Rock slope design guide page 11 section 100 rock slope design background 101 introduction this manual is intended to provide guidance for the design of rock cut slopes, rockfall catchment, and rockfall controls. Rock slope protection rsp is among various bank and shore.
The construction manual contains policies and procedures related to the duties of caltrans division of construction personnel, is for information only, and is intended as a resource for personnel engaged in contract administration. Toe protection methods two methods to provide protection. Reinforced soil slopes and embankments for the purposes of this document, a reinforced slope is defined as a compacted fill embankment that incorporates the use of horizontally placed geosynthetic reinforcement to enhance the stability of the soil structure. You may enter part of the word or the whole phrase all items. Slope protection consists of rock, concrete, or concreted rock or slope paving. Asce method based on isbash equation with a modification to account for channel bank slope uses isbash because it is in line with experience to rock size that will resist movement by flow velocity taken 10 feet from bank angle of attack less than 30 degrees s 6w 50 d. B pcc grouted rock slope protection this type of protection consists of rock slope protection having voids filled with portland concrete cement pcc grout to form a solid armor. Rockfall is the movement of rock of any size from a cliff or slope that is steep enough for.
Angular shaped rock may be used on any planned slope. Meets all specifications of section 72 of the 2018 ca department of transportation standard specifications. Earthsavers inventories a full line of geotextiles to meet industry standards for a wide variety of applications including drainage, stabilization, reinforcement, rock slope protection and weed control. Inlets in median areas or in traffic interchange loops 6. Trbs national cooperative highway research program nchrp synthesis 430. Rock gradations are required for several conservation practices in wisconsin. As a subcontractor, you are required to comply with the stormwater pollution prevention plan swppp for any work that you perform onsite. The foundation report and the special provisions clearly states that if an oscillator or rotator is used, you cant drill out the casing until you reach the specified tip elevation.
Some individuals feel rock riprap has been over used in the tahoe basin, depleting. Lowell washington state department of transportation p. For an additional 9 years he was a principal advisor to. Erosion control earthsavers erosion control llc united. Dutra mateirals rip rap is free of clay, dirt, and organic matter and commonly used for erosion control and landscaping. California bank and shore cabs rock slope protection design methodology replaced by hec no 23 guidance. Field methods of measuring discontinuities for rock slope stability analysis on. Army corps of engineers cecweg washington, dc 20314 manual no. Section 1 general sections are reserved in the standard specifications for correlation of special provisions and revised standard specifications with the standard specifications and for future expansion of the standard specifications the specifications are expressed in u. Slope stability, faults and other geologic hazards or constraints. See chapter 6 of the engineering field handbook efh for details. No rejections due to inferior material, complies with all.
United states army corps of engineers engineering manual em 111021601. Design guidelines for wire meshcable net slope protection balasingam muhunthan shanzhi shu navaratnarajah sasiharan omar a. Asuccessful rock slope stabilization program requires the integration of a number of interrelated activities, including geotechnical engineering as well as environmental and safety issues, construction methods and costs, and contracting procedures. Rsp, also called rock riprap or riprap, consists of one or more layers of rock. Detailed pieziometric data at multiple locations and depths within and below the slope will likely be needed. Caltrans state of california, department of transportation. As an alternative, you may cure the concretedrock slope protection. Slope protection consists of rock, concrete, or concreted rock or slope paving rock slope protection rock should demonstrate stability.
Solution of hydraulic engineering problems, 6th edition, mcgrawhill book co. New rsp guidelines are available in chapter 870 and chapter 880 new chapter of. Suitable slope protection rip rap materials demonstrate test results that consistently meet these standards. The method for placing rock will either be method a or method b, whichever the contract designates, as discussed under section 47203a, rock slope protection, earlier in this section. Geotechnical tgm federal lands highway us department of. Rock slope design guide ohio department of transportation. The toe of the riprap should be keyed into a stable foundation at its base as shown in figure 5b. Implementation of rock slope protection rsp design following an audit by fhwa, the caltrans bank and shore protection committee formally adopted new rsp guidelines with a modified version ofhydraulic engineering circular hec 23 gradations. Be alert for new or revised specifications that may affect the current manual guidance for contract administration. The design thickness of the riprap should extend a minimum of 3 feet horizontally from the slope.
For method a placement and the class of rsp described. Costeffective and sustainable road slope stabilization and erosion control presents information on costeffective and sustainable road slope stabilization techniques, with a focus on shallow or nearsurface slope stabilization and related erosion control methods used on lowvolume roads. Design guidelines for rock riprap are presented in chapter 4. Caltrans manuals are official publications from the california department of transportation. Assessing slope protection methods for weak rock slopes in. Chapter c5 california department of transportation pages.
The method of drilling selected by the specialty contractor will depend on the site and ground conditions and owned drill equipment. For method a placement and the class of rsp described, comply with the rock grading shown in the following table. There are some limitations on slope height and slope angle but it is a very effective measure. The report california bank and shore rock slope protec tion design racin et al. California bank and shore rock slope protection design practitioners guide and field evaluations of riprap methods final report no. Mar 30, 2012 caltrans has released a march 2012 version of ct 231. Choice of type for a particular site depends on site conditions, cost and availability, durability, safety, appearance, and environmental factors including aquatic habitat. California dot does not follow aashto m 288 for their geotextile specifications. Retaining walls and chapter 730 steep reinforced slopes. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes.
Resist degradation and have a durability of 52 minimum caltrans consistency. Flat or needle shaped rock must not be used unless the individual rock thickness is greater than 0. Method of test for relative compaction of untreated soils and aggregates using nuclear gauges. In general they have formatted and reworded the majority of the test method to make it clearer but the following is a list of the major changes. Verification test nails will be sacrificial and not incorporated as production nails. Caltrans standards set limits for gradation or size, apparent specific gravity, absorption, and durability index. Advantages, limitations, design guidelines, aesthetic value, construction materials, case examples, relative costs, and maintenance procedures are included for each method. Where feasible, rock slope protection should avoided where it may be considered unattractive or poses a public safety hazard. Hydraulic design of energy dissipators for culverts and channels hydraulic engineering circular number 14, third edition. Please provide what size rock slope protection is needed for bid item 73 and 74. Must be soil free of organic matter, trash, or other unsatisfactory material 3. Listed below are us fabrics geotextile products that meet the california dot geotextile specification, listed by their application. Rspfabric type of geotextile and quality requirements per section 96 rock slope protection fabric of the standard specifications. To remove a row from the calculations, uncheck the checkbox next to that row.
The document was revised to add background information, examples, and a glossary and to expand the bibliography. Design guidelines for wire meshcable net slope protection. Slopes can be covered with rock slope protection rsp to prevent erosion of the slope face. Progress schedule critical path method timerelated overhead construction site management prepare storm water pollution. United states army corps of engineers engineering manual. Guidelines for the design of other types of riprap are presented in chapter 6. Cure concretedrock slope protection by any one of the methods specified in section 901.
Protection apply to the standard bid item 721022 rock slope protection it, method b. There are three material gra requirements based on required rock layer dation thicknesses. Inspect the rock to ensure it has been cleaned of any adhering dirt and clay and is moistened before concrete placement. Method a is used where the stability of the rock slope protection is considerably dependent on the manner in which the individual rocks are placed. Caltrans traditional approach to stream bank stabilization has been to use standard methods like rock slope protection. The standard specifications provide two methods of placement for this type of protection. Caltrans made a comprehensive study of rock falls that have. Another method of covering a slope is to build retaining structures, single or multitiered, with backfill up to the top of the slope. The cabs layered rsp design method is preferred on caltrans projects.
One exception is biotechnical and soil bioengineering slope stabilization, a textbook written by. Common rock sizing relations hec11 usace isbash caltrans usbr. The aesthetics of common rock slope construction and mitigation practices can be enhanced with some modifications. Chapter 5 scour protection and channel control guide to. Another important aspect of grading inspection is to verify if deleterious materials, such as roots, trees and organic debris, are buried in the embankment. Shore protection method to protect highway embankments. Testing aashto, 2003 or annual book of astm stan dards astm. F90tl03 third edition internet october 2000 prepared in cooperation with the us department of transportation federal highway administration.
Asuccessful rock slope stabilization program requires the. Hattamleh department of civil and environmental engineering washington state university pullman, washington 991642910 thomas c. Protect geomembranes on dams, landfills, and containment basins with the industrys only complete geocell solution featuring the tendon and. Rocks placed over fabric shall be installed in accordance with caltrans method a unless the project plans allow for method b and the conditions in paragraph cs 705. This engineer manual em provides guidance for analyzing the static stability of slopes of earth and rock fill dams, slopes of other types of embankments, excavated slopes, and natural slopes in soil and soft rock. Caltrans identifies eleven different sizes and two placement methods. Section 870 deals with procedures, methods, devices and materials commonly used to mitigate the damaging effects of flowing water on transportation facilities and adjacent properties. The use of the california department of transportation standards is required to ensure that all transportation project contracts are clear, concise, correct, complete and in compliance with the federal highway administration fhwa. This is one of the first times a brush layering vegetative technique was incorporated into a caltrans biddable contract.