Field methods of measuring discontinuities for rock slope stability analysis on. 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. This slope may need to be flattened based on the short term stability of the soils in the existing slope. Slope stakes slope staking is a special form of leveling to determine the point at which the proposed slope intersects the existing ground. United states army corps of engineers engineering manual. Slope stability analysis for rock slopes involves a thorough understanding of the structural geology and rock mechanics. For most rock cuts on highway slopes, the stresses in the rock are. We analyzed seismic displacements using simplified spreadsheetbased methods developed by bray and travasarou 2007. Sites with potential slope stability problems should be more thoroughly evaluated. Chapter 6 seismic design 61 seismic design responsibility and policy 61.
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. The calculation of the factor of safety against instability of a slope is done using one of the following methods. Army corps of engineers cecweg washington, dc 20314 manual no. 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. The division of engineering services des is the lead project delivery organization for the design, construction, and oversight of bridge and other transportation structures. It provides guidance for understanding and applying policies, standards and criteria in recognition of the need to. Chapter 6 seismic design washington state department of.
Another important aspect of grading inspection is to verify if deleterious materials, such as roots, trees and organic debris, are buried in the embankment. Segmental retaining walls best practices guide 3 segmental retaining walls best practices guide for the speci. Trbs national cooperative highway research program nchrp report 611. 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. Details of slope stability analysis procedures are. Soil nails can be effective in increasing stability of a slope, or in constructing a wall that requires topdown excavation. The fhwa does not provide user assistance or support for this software. The changes in the design procedure are those that remove references to allowable velocity procedures and replace them with tractive stress evaluations. Soil nails are passive reinforcing elements that are installed and grouted in subhorizontal drilledholes to form a composite mass. 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. Highway 101 is the major northsouth highway in coastal california.
Some embankments constructed of material that is susceptible. Cdotdtdr200210 sponsored by the colorado department of transportation in cooperation with the u. The erosion and sediment control branch provides functional unit support for slope stabilization for. 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. 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. Only geotechnical practitioners experienced in collecting and analyzing rock structure data should perform these functions. Common rock sizing relations hec11 usace isbash caltrans. Department of transportation federal highway administration july 2002 colorado department of transportation research branch. Highway slope maintenance and slide restoration workshop 1988. Chapter 9 embankments washington state department of.
Deterministic seismic slope stability design charts for cohesivefrictional. 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. Geology and slope stability along the bodega bay fort ross highway corridor highway corridor landslide map map scale 1 miles 2 kilometers. It is essential that the engineering geologist be intimately familiar with all of these methods because they provide ways of. This broad definition encompasses many and varied applications. Read seismic analysis and design of retaining walls. Gec 11 design and construction of mechanically stabilized. Do not limit observations to just the footprint of the structure, wall, or other improvements. Be aware that spoils generated during slope shaping need to be removed and disposed of at an approved site. 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. The fhwa has discontinued the distribution of all other software through this website. The inherent stability of the soil must be satisfactory before riprap is used for surface stabilization.
Detailed pieziometric data at multiple locations and depths within and below the slope. Assess the performance of existing structures and improvements scour, slope stability, erosion, rock fall, etc. Slope stability evaluation and acceptance standards ladbs. Evaluation of slope stabilization methods us 40 berthoud pass by michael banovich william skip outcalt report no. California department of transportation caltrans, department of.
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. If topsoil is removed, store for replacement on site or use for future projects in need of topsoil. 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. Caltrans geotechnical manual geotechnical investigations. Caltrans records provide a useful guideline on the stability conditions of rock slopes and the causes of falls.
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. Caltrans geotechnical manual 1 embankments this module documents the departments standard of practice for the investigation, design, and construction of embankments. The cross sections used for our 2d slope stability analyses are based on cross section cc figure 4. Fhwa nhi06088 6 slope stability soils and foundations volume i 6 3 december 2006 6. Probabilistic seismic slope stability analysis and design canadian. Davis, state geologist state of california the resources agency conservation 30 qis 76. The document was revised to add background information, examples, and a glossary and to expand the bibliography. Slope shaping can provide favorable sites for plant establishment.
Caltrans geotechnical manual cellcrete corporation. Slope face stabilization for critical slope surfaces state of california. Its latest version, pcstabl6, allows also the analysis of reinforced soil slopes with geosynthetics, nailing, and tiebacks. 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.
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