Chapter 2 project geotechnical planning pdf 444 kb chapter 3 field investigation pdf 8 kb chapter 4 soil and rock classification and logging pdf 674 kb chapter 5 engineering properties of soil and rock pdf 3. They are certainly major factors in cut slope stability and in. This mechanically stabilized earth walls mse and reinforced soil slopes rss, design and construction guidelines manual which is an update of the current fhwa nhi00043, has evolved from the following aashto and fhwa references. Highway 101 is the major northsouth highway in coastal california. Davis, state geologist state of california the resources agency conservation 30 qis 76. Deterministic seismic slope stability design charts for cohesivefrictional. Detailed pieziometric data at multiple locations and depths within and below the slope. 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. Slope stakes slope staking is a special form of leveling to determine the point at which the proposed slope intersects the existing ground. This manual introduces a framework for the design of soil nail walls that takes into account factors of safety used in the asd method while. Evaluation of slope stabilization methods us 40 berthoud pass by michael banovich william skip outcalt report no. Probabilistic seismic slope stability analysis and design canadian. Highway slope maintenance and slide restoration workshop 1988. Chapter 6 seismic design washington state department of.
Department of transportation federal highway administration july 2002 colorado department of transportation research branch. Gec 11 design and construction of mechanically stabilized. Caltrans geotechnical manual 1 embankments this module documents the departments standard of practice for the investigation, design, and construction of embankments. Another important aspect of grading inspection is to verify if deleterious materials, such as roots, trees and organic debris, are buried in the embankment. The cross sections used for our 2d slope stability analyses are based on cross section cc figure 4. High resolution sensing techniques for slope stability studies, final report 1979. Details of slope stability analysis procedures are.
If topsoil is removed, store for replacement on site or use for future projects in need of topsoil. For most rock cuts on highway slopes, the stresses in the rock are. Do not limit observations to just the footprint of the structure, wall, or other improvements. United states army corps of engineers engineering manual. Slope stability evaluation and acceptance standards ladbs. Chapter 14 simplified seismic slope displacement procedures jonathand. This broad definition encompasses many and varied applications. Field methods of measuring discontinuities for rock slope stability analysis on. Assess the performance of existing structures and improvements scour, slope stability, erosion, rock fall, etc. Segmental retaining walls best practices guide 3 segmental retaining walls best practices guide for the speci. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6.
Assessment of groundwater conditions in the rock discontinuities, as is true of any slope, is also critical to the assessment of stability 01, 28, 32, 49, and 40. Common rock sizing relations hec11 usace isbash caltrans. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of. Caltrans in planning for landslides, geologists with the california department of conservation, division of mines and geology, have prepared maps of the geology and landslides of the area adjacent to highway 1 on the big sur coast. In some cases, the stability andor durability of the existing embankment fill may be questionable because the fill materials are suspect or because slope instability in the form of raveling, downslope lobes, or slope failures have been observed during the site reconnaissance phase. Some embankments constructed of material that is susceptible. Geotechnical technical guidance manual may 2007 introduction 11 section 1 introduction this geotechnical technical guidance manual tgm provides technical guidance for geotechnical work performed by the federal lands highway flh. The division of engineering services des is the lead project delivery organization for the design, construction, and oversight of bridge and other transportation structures.
The changes in the design procedure are those that remove references to allowable velocity procedures and replace them with tractive stress evaluations. Embankone dimensional compression due to embankment loads users manual 1992. Slope shaping can provide favorable sites for plant establishment. 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. Geology and slope stability along the bodega bay fort ross highway corridor highway corridor landslide map map scale 1 miles 2 kilometers. Its latest version, pcstabl6, allows also the analysis of reinforced soil slopes with geosynthetics, nailing, and tiebacks. Caltrans geotechnical manual cellcrete corporation. California department of transportation caltrans, department of. Cdotdtdr200210 sponsored by the colorado department of transportation in cooperation with the u.
Caltrans geotechnical manual geotechnical investigations. The back slope of each bench is cut at a typical 1h. The fhwa has discontinued the distribution of all other software through this website. Caltrans records provide a useful guideline on the stability conditions of rock slopes and the causes of falls. Only geotechnical practitioners experienced in collecting and analyzing rock structure data should perform these functions. Slope face stabilization for critical slope surfaces state of california. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. United states army corps of engineers engineering manual em 111021601.
We analyzed seismic displacements using simplified spreadsheetbased methods developed by bray and travasarou 2007. Soil nails are passive reinforcing elements that are installed and grouted in subhorizontal drilledholes to form a composite mass. California geological survey landslides and slope stability in the highway 101 corridor leggett to red mountain creek introduction u. In the lecture part of this course we will discuss a variety of methods of analysis of slope stability and instability. Trbs national cooperative highway research program nchrp report 611. Read seismic analysis and design of retaining walls. This engineer manual em provides guidance for analyzing the static stability of slopes of earth and rockfill dams, slopes of other types of embankments, excavated slopes, and natural slopes in soil and soft rock. The inherent stability of the soil must be satisfactory before riprap is used for surface stabilization. The calculation of the factor of safety against instability of a slope is done using one of the following methods. Landslides and slope stability bodega bay to fort ross in the highway 1 corridor july 1, 2006 introduction highway 1 is the major northsouth highway along the west coast of california. Improve slope stability for mitigation of landslides. Sites with potential slope stability problems should be more thoroughly evaluated.
It provides guidance for understanding and applying policies, standards and criteria in recognition of the need to. The document was revised to add background information, examples, and a glossary and to expand the bibliography. Seismic analysis and design of retaining walls, buried structures, slopes, and embankments explores analytical and design methods for the seismic design of retaining walls, buried structures, slopes, and embankments. Chapter 6 seismic design 61 seismic design responsibility and policy 61. The erosion and sediment control branch provides functional unit support for slope stabilization for. Chapter 9 embankments washington state department of. The fhwa does not provide user assistance or support for this software. Soil nails can be effective in increasing stability of a slope, or in constructing a wall that requires topdown excavation.
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