2 edition of Stability, shear and sliding resistance, and deformation of rock foundations found in the catalog.
Stability, shear and sliding resistance, and deformation of rock foundations
P. D. Evdokimov
1967 by Israel Program for Scientific Translations .
Written in English
|Statement||by P.D. Evdokinov and D.D. Sapegin.|
|Contributions||Sapegin, D. D.|
Soil/Rock Parameters and Ground Water Conditions Based On: ASD Factors of Safety LRFD Rn Bf For a constant value of settlement eB = MB / P eL = ML / P Stress Applied to Soil Strip Footing 1 2 2 3 3 d a d’ e = C + s’ tan f Soil Shear Strength Df B>Df B Ground Surface sv = Df Pp Pp c c b a I b’ b b’ Table Resistance Factors.
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The interface of dams and foundation. This is followed by evaluation of shear and sliding stability along existing weak planes, if any, within the foundation. The parameters needed for primary design are the cohesion and angle of internal friction of the dam foundation interface/weak zones of the foundation.
stability analysis and shear strength testing. On the other hand, deformation behaviour is a crucial design consideration for foundations but not for slopes while controlled failure is acceptable for some slopes but totally unacceptable for foundations.
This report is thereforeFile Size: 3MB. The present study aims to elucidate the problem of a rock mass structural plane with a range of damage degrees and the numerical model selection for analysis of a slope with multiple sliding surfaces.
Based on the relative displacement between blocks, the dynamic strength reduction-discontinuous deformation analysis (hereinafter referred to as DSR-DDA) method is proposed for studying slopes Author: Shuhong Wang, Chengjin Zhu, Pengyu Wang, Zishan Zhang.
1. It was experimentally established that depending on the strength and level of normal stresses at the contact of a concrete structure with a rock foundation two modes of loss of stability can occur: shear (sliding) at small values of the shear parameters tan ϕ and c and normal stresses σ and tilting (crushing of the foundation under the downstream face) at large values of the indicated Author: Yu.
Fishman. Natural local shear keys at a dam–rock interface may greatly improve the sliding stability of gravity dams; however, their effect is found to be sensitive to dam size and rock mechanical properties.
Roughness effects on shear strength are found to generally decrease for larger dams. The results also reveal that the influence of rock strength parameters is more significant when the rock foundation surface includes prominent natural shear keys. • shear resistance • backfill pressure • cohesion & friction of soil • effect of water • settlement • rock fracture behavior Structural Strength and Serviceability There are significant serviceability considerations with soil.
Soils can settle considerably under foundation loads, which can lead to redistribution of moments inFile Size: KB. Traditionally the interface between rock foundations and concrete retaining structures (dams, retaining walls, etc.) is characterized as a weakened surface along which a sliding can occur, and design codes often state that such sliding is a likely failure mechanism for these structures , , .Cited by: This second edition of the successful Foundations on Rock presents an up-to-date practical reference book describing current engineering practice in the investigation, design and construction of foundations on rock.
An extra chapter on Tension Foundations has been included. The methods set out are readily applicable to high rise buildings, bridges, dams and structures subject to 5/5(1).
Sliding stability. Sliding of a structure on its foundation represents the most difficult aspect of a stability analysis, especially in those instances where the foundation is jointed, and where the strength properties vary throughout the foundation.
The approach to evaluating sliding stability is one that uses the limit equilibrium method. I am checking foundation for sliding. I have the base shear form the structure above. Now my question do i have to consider lateral force due to foundation weight itself to add to the demand sliding force.
If that is case, I have hard time qualifying foundation for the sliding. What lateral force is due to the foundation weight. Chapter 8 Foundation Design Overview • overall slope stability • subsurface profile (soil, groundwater, rock) • shear strength parameters • compressibility parameters (including consolidation, shrink/swell potential, and elastic modulus) • frost depth.
Shear strength of discontinuities Introduction All rock masses contain discontinuities such as bedding planes, joints, shear zones and faults. At shallow depth, where stresses are low, failure of the intact rock material is minimal and the behaviour of the rock mass is controlled by sliding on the discontinuities.
Stability, shear and sliding resistance, and deformation of rock foundations. Jerusalem, Israel Program for Scientific Translations [available from U.S. Dept. of Commerce, Clearinghouse for Scientific and Technical Information, Springfield, Va.] (OCoLC) Material Type: Government publication, National government publication.
This will have an influence on the stability of the west slope if the shear strength failure mechanisms of the rock masses are considered to dominate the slope stability in wet conditions. The results for slopes under the other conditions show a stable slope with. The shear strength of the concrete–rock interface has a substantial influence on the sliding stability of concrete gravity dams founded on rock.
While several studies have been done on concrete–rock contacts, there remains uncertainty regarding the peak shear strength of partially bonded interfaces. There exists, in particular, an uncertainty regarding the contribution from surface Cited by: the Shear Strength Reduction (SSR) technique.
By definition, the factor of safety of a slope is the “ratio of actual soil shear strength to the minimum shear strength required to prevent failure,” or the factor by which soil shear strength must be reduced to bring a slope to the verge of failure (Duncan, ).
In the SSR finite element. SLOPE STABILITY 1. Purpose. 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.
Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. This paper investigates the effects of rock foundation roughness on the shear strength of dam-rock interfaces and dam sliding stability.
For this purpose, bathymetric and light detection and. The shear behavior of rock joints is the determinate factor that controls stability of rock mass [1–6]; it has been a concern in rock mechanics and rock engineering [7–10].
Numerous joint shear strength models have been established based on experiments [ 11 – 14 ] and theoretical analyses [ 15 – 17 ]. • If shear stress exceeds the shear strength - failure occurs 21 Compressive Strength!. Relationship between shear and normal stresses during a strength test (and at failure) is critical to understanding deformation behavior of the material.
Way to test shear strength - Direct shear test Variable shear and normal stresses can be applied Shear strength of discontinuities at very high confining pressure (OA is sliding above asperities, AB is shearing of rock asperities, and BC is critical state of rock material at very high confining stress).
Stability against sliding in x direction Passive resistance of soil in x direction; H xpas = × K p × (h 2 + 2 × h × h soil) × B × ρ soil = kN Total resistance to sliding in x direction; H xres = H friction + H xpas = kN PASS - Resistance to sliding is greater than horizontal load in x direction Stability against sliding in File Size: KB.
stability of the slope, will affect the selection of soil and rock shear strength parameters used as input in the analysis. For short-term stability analysis, undrained shear strength parameters should be obtained.
For long-term stability analysis, drained shear strength parameters should be obtained. Shear strength of a soil is indicative of its resistance to erosion.
Specifically, it is defined as the resistance to deformation by the action of tangential (shear) stress. Soil shear strength is made up of cohesion between particles and resistance of particles sliding over each other due to friction or interlocking.
Cohesion is composed of true cohesion and apparent cohesion. Geotechnical - Load and Resistance Factor Design By Mir Zaheer, P.E., Bearing & Sliding Resistance at the Strength & Extreme Limit States Check Footing at Strength Limit State for Bearing, Sliding and Eccentricity.
• Shear resistance (strength limit). I Failure Mode: Sliding Over Foundation Limit state equation 1 Bz/2 STATE EQUATIONS SWL SLIP FAILURE PLANE BEDDING LAYER RUBBLE MOUND Fig. Sliding between caisson and rubble mound.
The failure progresses as a horizontal displacement of the caisson due to lack of frictional resistance between the caisson and the bedding layer/rubble mound. of safety F, with respect to strength, may be expressed as follows: F = τ ff τ () where τ ff is the maximum shear stress that the soil can sustain at the value of normal stress of σn, τ is the actual shear stress applied to the soil.
Equation may be expressed in a slightly different form as follows: τ = c F + σn tan φ F ()File Size: KB. The shear strength along any plane is mobilized by cohesion and frictional resistance to sliding between soil particles.
The cohesion c and angle of friction φ of a soil are collectively known as shear strength parameters. In this chapter we will define, describe, and determine the shear strength of soils. Lateral Load Capacity of Piles M.
DAVISSON, Department of Civil Engineering, University of Illinois, Urbana Pile foundations usually find resistance to lateral loads from (a) passive soil resistance on the face of the cap, (b) shear on the base of the cap, and (c) passive soil resistance against the pile shafts.
The latter source is. shear strength as a function of the stress normal to the plane to be sheared- which in the present case is the interface between concrete and foundation rock. Peak direct shear strength corresponds to the maximum shear stress in the shear stress vs.
displacement curve whereas the Residual shear strength is the shear stress at which no further rise. #Stability of Dam Body /Stability against sliding failure of embankment (evaluation of pore-water pressure during and after construction, shear strength and deformation characteristics of fill materials) /Seismic stability (seismic coefficient method, liquefaction, dynamic deformation characteristics,File Size: KB.
Soils and Foundations Chapter 3 Bangladesh National Building Code 6‐ ALLOWABLE BEARING CAPACITY: The maximum net average pressure of loading that the soil will safely carry with a factor of safety considering risk of shear failure and the settlement of foundation.
This is the minimum. Get this from a library. Design of gravity dams on rock foundations: sliding stability assessment by limit equilibrium and selection of shear strength parameters. [Glenn A Nicholson; United States. Army. Corps of Engineers.]. Sliding resistance problem The assessment of the reliability of a gravity foundation on clay till is usually based on the undrained shear strength, ru, in the disturbed Fig.
2Interface problem studied (shown for anchor blocks) surface layer of the clay till of importance to sliding, and hence this is the key parameter. Causes of Rock Deformation • Stress - pressure placed on rocks • Strain - deformation of the rock • Strength - rock resistance to deformation • Brittle deformation - the rocks break or fracture.
Occurs at low temperatures and low pressures. • Ductile deformation - the rocks bend or flow. Occurs at higher temperature and pressures. The factor of safety of a slope (F s) is invariably assessed using methods underpinned by moment, force, and (or) shear strength equilibrium concerning slip method inherently embeds some form of limitations, despite being popularly adopted in practice.
In this paper, a new F s is devised using the ratio of ultimate energy (e u, upon sliding) over accumulated “elastic” by: 1. This paper studies the dam foundation stability of the representative no.
3 powerhouse-dam section of the Three Gorges Dam (TGD), China, using elastic-plastic finite element shear strength reduction technique. In the no. 3 powerhouse-dam section area, the low-angle discontinuities, such as joints and faults, are mostly developed in the dam foundation rock mass, and constitute deep foundation Author: Ming Xun Hou, Xiu Run Ge.
Stability Against Sliding dam, friction, resistance, foundation and soil the resistance to sliding on the foundation can be increased (1) by driving a row of inclined piles in front of the dam or (2) by sinking a comparatively narrow tongue of the wall below the level of the main foundation.
If the dam is founded upon bed-rock, the. The reinforcement effect of geogrids is exerted through the fixing and occlusion with the surrounding soil to ensure the stability of reinforced structure.
Based on the friction reinforced mechanism, the geogrids play the role of anti-shear and anti-pulling. So the indexes of interface strength identified by shear and tensile tests are usually used to conduct the stability analysis of Author: Xiaosong Tang, Yongfu Wang, Zhixiang Liu.
In order to evaluate the shear deformation characteristics, the direct shear tests for the rock-like specimens with regular sawtooth were carried out in the laboratory. The different asperity angles and different normal stress conditions were considered and the dilatancy characteristics and the corresponding failure modes were analyzed accordingly.
The uncommon asperity angle of 25°, 40°. founded on it to accommodate the level of deformation Consider: • Consequences of failure and conservatism of hazard assessment and stability analyses • Defensive measures that provide redundancy, e.g., crack stoppers, filters, and chimney drain for dams, & robust mat foundations, slip layer, and ductile structure.Inﬂuence of water on shear strength of discontinuities 88 Laboratory testing of shear strength 88 Shear strength of rock masses by back analysis of slope failures 90 Hoek–Brown strength criterion for fractured rock masses 92 Generalized Hoek–Brown strength criterion 95 Modulus of deformation 99 Mohr.
Stable-sliding shear experiments: we measured the stable-sliding frictional strength and permeability of the saturated shear zone material at .