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bearing capacity of rock pdf

Bearing Capacity of Rocks IITK

Bearing Capacity of Rocks Intact Rock MassIntact Rock Mass A rock mass with joint spacing greater than 4 to 5 times the width of the footing. Local and General shear failure is associated to brittleGeneral shear failure is associated to brittle and ductile rock respectively. Jointed Rock MassJointed Rock Mass . General Shear Failure Local Shear FailureLocal Shear Failure •

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Determining Rock Mass Bearing Capacity and Strength

A final foundation design is controlled by considerations such as settlement, stability from sliding and overturning rather than by bearing capacity. However it is still makes sense for a designer to evaluate the rock mass strength bearing capacity to ensure that the designed loads in no way exceed the capacity of the rock to carry the required load.

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Bearing Capacity Calculation of Rock Foundation based on

Bearing Capacity Calculation of Rock Foundation based on Nonlinear Failure Criterion Tang Jinga, Liu Yongbiaoa* aSichuan College of Architecture Technology,Deyang 618000, P.R. China Abstract Conventional foundation bearing capacity calculation is based on Mohr–Coulomb linear failure criterion. But it is verified that almost all kinds of rock’s strength envelope is nonlinear

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SAFE BEARING CAPACITY VALUES OF DIFFERENT SOILS &

21/09/2015· TYPE OF ROCK OR SOIL. SAFE BEARING CAPACITY (kN/m 2) (kg/cm 2) ROCKS. 1: Rocks (hard) without lamination and defects, for example granite, trap and diorite: 3300: 33: 2: Laminated rocks, for example sand stone and lime stone in sound condition: 1650: 16.5: 3: Residual deposits of shattered and broken bed rock and hard shale, cemented material : 900: 9: 4: Soft rock

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A Study on Bearing Capacity of Submerged Rock Foundation

determination of bearing capacity of rock mass under dry condition while for submerged condition, it is outnumbered. In this study, determination of submerged bearing capacity of rock mass is attempted. Most cases, the rock substratum is considered to be homogeneous, intact, but the practical scenario does not recommend so. In-situ rock mass variability renders the

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Piles Capacity Reference Manual

But generally the ultimate bearing capacity of rock sockets are actually limited by the compressive strength of reinforced-concrete inside the shaft. • We strongly recommend not to rely only on these simple approximations for pile bearing capacity in rocks, since there are many other methods which take into consideration other crucial rock parameters such as the RQD,

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An Introduction to Bearing Capacity Analysis

BEARING CAPACITY OF ROCK. For a structure founded on rock, adequate exploration is necessary to determine the number and extent of defects, such as joints, shear zones, and solution features. Estimates of the allowable bearing pressure can be obtained from table 1. Conservative estimates of the allowable bearing pressure can be obtained from the following

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(PDF) Evaluation of Capacity of Rock Foundation Sockets

The derived relation indicates that the end bearing capacity factor, Nc, which is the ratio of the end bearing capacity, qmax, and the unconfined compressive strength, σc, of intact rock

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January 12, 2007 Foundations on Rock wnrockeng

Bearing capacity allowable bearing pressure 2. Settlement layered formations 3. Stability foundations of bridges and dams subject to tensile and/or inclined loads Worked examples: settlement stability. Rock Foundation Characteristics Pacific Northwest QStrong rock with high allowable bearing capacity QRock contains persistent discontinuities QCanyons often

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Lectures on Rock MechanicsLectures on Rock Mechanics

• What is the bearing capacity of rock on surface an at depths? • What is the shear strength of rocks?What is the shear strength of rocks? • What is the response of rocks under dynamic / earthquake type loading? • What is the modulus of elasticity of rock and how to get it? • What are the effects of rock defects (jointing beddingWhat are the effects of rock defects (jointing

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IS 12070 (1987): Code of Practice for Design and

3.2 The calculation of bearing capacity, the distribution of stresses, and the prediction of settlement and the choice of allowable load will depend on the following factors, which shouldbe fully considered during design: i) Occurrmces Dun11g Excavation a) Undulating rock surface below a level ground; b) Hetrogeneity of rock mass ( the bearing capacity may vary up to 10 times in apparently the

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A Study on Bearing Capacity of Submerged Rock Foundation

determination of bearing capacity of rock mass under dry condition while for submerged condition, it is outnumbered. In this study, determination of submerged bearing capacity of rock mass is attempted. Most cases, the rock substratum is considered to be homogeneous, intact, but the practical scenario does not recommend so. In-situ rock mass variability renders the deterministic analysis to be

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Axial bearing capacity of socketed single cast-in-place piles

The bearing capacity of rock-socketed piles is calculated with various empirical correlations, which typically are obtained by a back analysis of the pile load tests. In these correlations, the unconfined compressive strength (s c)of rock is the most commonly considered parameter. 3. Interpretation of pile load tests Many approaches have been proposed in the literature to determine the

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Intro to Bearing Capacity Analysis R CED Engineering

BEARING CAPACITY OF ROCK. For a structure founded on rock, adequate exploration is necessary to determine the number and extent of defects, such as joints, shear zones, and solution features. Estimates of the allowable bearing pressure can be obtained from Table 1. Conservative estimates of the allowable bearing pressure can be obtained from the following expression: Q a = 0.2 q u (Eq. 2

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Piles Capacity Reference Manual

But generally the ultimate bearing capacity of rock sockets are actually limited by the compressive strength of reinforced-concrete inside the shaft. • We strongly recommend not to rely only on these simple approximations for pile bearing capacity in rocks, since there are many other methods which take into consideration other crucial rock parameters such as the RQD, shaft roughness and the

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Chai, J. Shallow Foundations. Bridge Engineering Handbook

Bearing Capacity of Fractured Rock • Settlement of Foundations on Rock 31.8 Structural Design of Spreading Footings 31.1 Introduction A shallow foundation may be defined as one in which the foundation depth (D) is less than or on the order of its least width (B), as illustrated in Figure 31.1. Commonly used types of shallow foundations include spread footings, strap footings, combined

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An Evaluation of the Shaft Resistance of Piles Embedded in

Keywords: pile foundations in rocks, bearing capacity of piles, skin friction, dynamic tests on piles. 1. Introduction Pile foundations drilled in rock are required for heavy structures and/or when rock occurs at relatively shallow depths. Although a straightforward solution, the design en-gineer often faces questions such as (i) at what point of the soil/weathered rock/sound rock profile

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PREDICTION OF BEARING CAPACITY OF HIGHLY WEATHERED

The present study is an attempt to estimate the Bearing Capacity of Highly Weathered Rock formations. It is intended to estimate the bearing capacity in such formations (Highly weathered formations) by various Methods. Adequate data is collected from the site and Laboratory Studies. The following Site Exploration and Laboratory Testing Program are conducted for determining the various Physical

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CHAPTER 17 Free

Vv b^ Good bearing rock S Bearing capacity can be increased by underreaming the bottom (in non-caving materials) Disadvantages 1. Installation of drilled piers needs a careful supervision and quality control of all the materials used in the construction 2. The method is cumbersome. It needs sufficient storage space for all the materials used in the construction 3. The advantage of

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ASSESSING DRIVEN STEEL PILE CAPACITY ON ROCK USING

m = factor based on rock properties N c = bearing capacity factor N k = cone bearing factor N q = bearing capacity factor N γ = bearing capacity factor NI = bearing capacity factor P = pile load (F) P u = ultimate pile capacity (F) p = overburden pressure (F/L2) q = ultimate bearing capacity (F/L2) q c = cone tip resistance (F/L 2) q t = ultimate toe bearing resistance (F/L 2) q tc = ultimate

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