Foundation soil at the toe of dam has void ratio of 0.7. The specific gravity of soil grains is 2.6. To assure safety against piping, the upward gradient should not exceed 30% of gradient at which quick condition occurs. The maximum permissible upward gradient is

Foundation soil at the toe of dam has void ratio of 0.7. The specific gravity of soil grains is 2.6. To assure safety against piping, the upward gradient should not exceed 30% of gradient at which quick condition occurs. The maximum permissible upward gradient is

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The saturated unit weight of fine sand is 17.5 kN/m³. The critical gradient for the fine sand will be
The site soil consists of loose sand that are dry within the top 3 m and saturated below. The present blow counts ranging between 2 and 10. Due to concerns regarding Iliquefaction dynamic compaction is proposed. The soil should be improved to a depth of 10 m A 20-ton tamper with a diameter of 1.5 m and a height of 1.5 m is available. Assume a square pattern More than one pass may be required Estimate: Number of drops required Number of passes required
How to solve this question? A soil has a dry density of 1.84 g/cm3 and void ratio of 0.45. Calculate the factor of safety against quick sand condition if the hydraulic gradient is given as 0.46.
3. For a saturated sand deposit, the void ratio and the specific gravity of solids are 0.70 and 2.67, respectively. The critical (upward) hydraulic gradient for the deposit would we
answer should be on the choices
Effective Stresses in Soil Problem 3. A 4m thick of clay is overlain by 4m thick of sand. The ground water table is 1m below the natural grade line. Clay and sand have saturated unit weights of 19.5 and 17.3 kn/m³ respectively. Sand above the water retains water content of 30%. LL and void ratio of clay are respectively 60% and 27.3%. Specific gravity of sand solid is 2.7. 1. Find the compression index. 2. Find the moist unit weight of sand above the water table. 3. Find the effective soil pressure at mid clay layer.
A 1.25 m layer of soil having the porosity 0.35 and specific gravity 2.65 is subjected to an upward seepage head of 1.85 m. What depth of coarse sand would be required above the existing soil to provide a factor of safety of 2 against piping? Assume that coarse sand has the same porosity and specific gravity as the soil and there is negligible head loss in sand.
A 650-kN column load is supported on a 1.5 m wide by 2.0 m long by 0.5 m deep spread foot-ing. The soil below is a well-graded, normally consolidated sand with g = 18.0 kN/m3 and the following SPT N60 values:Depth (m) 1.0 2.0 3.0 4.0 5.0N60 12 13 13 8 22 The groundwater table is at a depth of 25 m. Compute settlement of the footing using the gen-eralized elastic method with Christian and Carrier’s (1978) influence factors.
3. Compute the effective vertical pressure at the mid height of the clay layer. Problem 3. A 4m thick of clay is overlain by 4m thick of sand. The ground water table is 1m below the natural grade line. Clay and sand have saturated unit weights of 19.5 and 173 kn/m respectively. Sand above the water retains water content of 30%. LL and void ratio of clay are respectively 60% and 27.3%. Specific gravity of sand solid is 2.7. 1. Find the compression index. Find the moist unit weight of sand above the water table. Find the effective soil pressure at mid clay layer. 2. 3.
Q3: A soil has a porosity (n) of 0.40 and a specific gravity of solids (Gs) of 2.70. Determine the critical hydraulic gradient (i).
A dam includes a sheet pile "cut off" wall near the toe, installed to 7 ft below the groundline. Water seepage is assumed to be at steady state at this time step shown. At this time, the depth of the upstream pond (headwater) is 5 feet. The groundwater is at the same level as the ground on the downstream/tailwater side. The sand stratum thickness, where water is flowing, is 9 ft thick. The permeability of the sand, in the zone of the flow net, is k=42ft/day, the length of the dam (into the page) is 150 ft, and the unit weight of the sand is γsat=128 lb/ft3 (saturated unit weight of the soil). Use γw=62.4 pcf (unit weight of water) for your calculations, where necessary.What is the factor of safety against a quick condition? (use the dimensions given in the problem state to help estimate lengths, where needed)