Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 6, Problem 6.17P
To determine
Find the suitability number and the rating for backfill material.
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3. The following table lists the results of a standard Proctor assay. Determine the maximum dry compaction density and the optimum moisture content. Also obtain the void ratio and degree of saturation for optimum moisture content. Assume Gs = 2.68.
A layered soil is shown with the corresponding values K1, K2, and K3.
Compute the equivalent horizontal coefficient of permeability
Compute the equivalent vertical coefficient of permeability
Compute the ratio of the equivalent horizontal coefficient of permeability to the equivalent vertical coefficient of permeability
Given the following data for the normally consolidated clay layer in the field. Compute the primary consolidation settlement. Thickness of clay layer= 3.0m Cc= 0.30 e= 0.70 Overburden pressure= 250 Kpa ΔP= 46 kPa Cα= 0.022
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Principles of Geotechnical Engineering (MindTap Course List)
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- In the soil profile shown below, if the water table changes from level WT0 to level WT1 permanently, what is the change in the ground surface elevation in mm in the long term after primary consolidation is completed? Assume that the clay layer is initially normally consolidated. Use a single clay layer in your calculations and positive value for settlement. (Acceptable tolerance = 4%)arrow_forwardCONSTANT HEAD PERMEABILITY TEST a. why the need to get the temperature of the collected water? b. what is the reason why we need a saturated specimen? c. why does the soil need to be compacted before undergoing the process?arrow_forwardIt has been anticipated that the soil under the proposed dam is contaminated, and needs to be removed and backfilled to a depth of 2.5 feet. A Standard Proctor compaction test was conducted on soil from a borrow pit, with the results shown below right. Based on the results: a) Plot the Proctor curve for the borrow soil. b) Find the optimum water content and max. dry unit weight for the borrow soil. c) Determine whether the unit weight of the top layer can be met by compacting to 95% of maximum, and what the range of moisture content for that unit weight is. d) If we borrow soil from a pit with a void ratio of 0.71, determine how much soil we need to borrow to backfill below the dam to match the in-situ void ratio of the top layer of soil.arrow_forward
- 1. Draw the compaction curve using the following given data from a standard Proctor test. 2. From the compaction curve you drawn, determine the Optimum Moisture Content and the Maximum Dry Unit Weight.arrow_forwardThe following technical data are given below: Overburden pressure = 180KPa Increase in pressure = 140KPa Clay thickness = 8m Compression Index = 0.315 Void ratio = 1.132 What is the total settlement in clay?arrow_forwardA) What is the value of the natural water content in percentage?B) What is the value of the in-situ void ratio?C) What is the value of the degree of saturation in percentage?arrow_forward
- An in-situ (subgrade) soil located in Colorado (TMI = -20) has the following index properties: Percent passing No.200 = 25 percent Plasticity Index = 20 Compaction tests indicate this soil has an optimum degree of saturation of 85 and a maximum dry unit weight of 100 PCF. The resilient modulus at optimum conditions is 10,000 psi. Estimate the resilient modulus at equilibrium with the environment for this soil. Clearly outline the steps followed and assumptions used to find the answer.arrow_forwardb) Determine D10, D30 and D60 for each soil. c) Calculate the uniformity coefficient and coefficient of gradation Cu and Ccrespectively.arrow_forwardA sample of sand above the water table was found to have a naturalmoisture content of 10% and a unit weight of 120 lb/ft^3. Laboratory tests on a driedsample indicated values of void ratio as 0.45 and 0.90, for the densest and looseststates respectively. Compute the (a) degree of saturation, and (b) relative density.Use GS=2.65.arrow_forward
- Results of a standard proctor ompaction test on a silty sand are shown. PLEASE COMPLETE SOLUTION. 1) Find the maximum dry unit weight and optimum moisture content. 2) What is the moist unit weight at optimum moisture content? 3) What is the degree of saturation at optimum moisture content? Given: ?? = 2.69 4) If the required field dry unit weight is 18.5 ??/?3, what is the relative compaction? 5) What should be the range of compaction moisture contents in the field to achieve the above relative compaction? 6) If the minimum and maximum void ratios are 0.31 and 0.82, respectively, what is the relative density of compaction in the field?arrow_forward9. The results of a Standard Proctoretest is tabulated as follows: (CHECK PICTURE) Determine the maximum dry unit weight of compaction Determine the void ratio at the optimum moisture content Gs = 2.68 Determine the optimum moisture content Determine the degree of saturation at the optimum moisture contentarrow_forwardA laboratory consolidation test on a 20 mm thick sample of soil shows that 90% consolidation occurs in 30 minutes. Plot a settlement (degree of consolidation) – time curve for a 10 m layer of this clay in the field for (a) single drainage, and (b) double drainage.arrow_forward
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