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Predicting Potential Heave And Heave With Time In Swelling Foundation Soils

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Predicting Potential Heave And Heave With Time In Swelling Foundation Soils

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Author : Lawrence D. Johnson
language : en
Publisher:
Release Date : 1978

Predicting Potential Heave And Heave With Time In Swelling Foundation Soils written by Lawrence D. Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Foundations categories.

Predicting Potential Heave And Heave With Time In Swelling Foundation Soils

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Author : Lawrence D. Johnson
language : en
Publisher:
Release Date : 1978

THIS STUDY EVALUATES PROCEDURES FOR PREDICTING ONE-DIMENSIONAL POTENTIAL HEAVE OF FOUNDATION SOILS AND THE RATE AT WHICH HEAVE MAY OCCUR. A computer program ULTRAT (Ultimate and rate of heave) was developed for predictions of potential heave and heave with time based on two models for characterization of swell behavior: the soil suction and mechanical swell models. The soil suction model relates volume change with change in matrix soil suction and water content.

Prediction Of Potential Heave Of Swelling Soil

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Author : LD. Johnson
language : en
Publisher:
Release Date : 1978

Prediction Of Potential Heave Of Swelling Soil written by LD. Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Capillary pressures categories.

Methods of characterizing swell behavior and predicting total potential heave of foundation soils were compared with field measurements for three test sections. The methods used included nine empirical procedures, three types of consolidometer tests, and a thermocouple psychrometric soil suction method. It was found that simple classification tests can provide reasonable estimates of field heaves. Predictions of potential heave using the consolidometer were sometimes low and may often represent minimal heaves when compared to field observations. Predictions based on the soil suction method provided reasonable upper limits for all test sites.

Properties Of Expansive Clay Soils

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Author : Lawrence D. Johnson
language : en
Publisher:
Release Date : 1975

Properties Of Expansive Clay Soils written by Lawrence D. Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Clay categories.

A relatively economical and expedient numerical procedure and computer code based on the finite difference method were developed for predicting heave with time for heterogeneous expansive soils beneath structures idealized as two-dimensional. The computer code will also compute the potential heave assuming saturation of the foundation soils based on McDowell's swell data. The heave with time estimates should be useful for structures near which penetration of rainwater from the ground surface is permitted, provided that ponding of surface water and external water from leaking water and sewer lines does not occur. The potential heave should be useful if the foundation soils become saturated from excessive watering, poor surface drainage, and leaking water and sewer lines. The required input data include the structural load, specific gravity, liquid and plastic limits, initial dry density and water content, coefficient of vertical permeability, ratio of the horizontal to the vertical coefficient of permeability, and swell and suction relationships of the foundation soils.

Evaluation Of Laboratory Suction Tests For Prediction Of Heave In Foundation Soils

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Author : Lawrence D. Johnson
language : en
Publisher:
Release Date : 1977

Evaluation Of Laboratory Suction Tests For Prediction Of Heave In Foundation Soils written by Lawrence D. Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Foundations categories.

Evaluation Of Laboratory Suction Tests For Prediction Of Heave In Foundation Soils

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Author : Lawrence D. Johnson
language : en
Publisher:
Release Date : 1977

Commonly used methods for determining swell potential and predicting volume change and in situ heave are evaluated from the standpoint of simplicity, economy, reliability of test data, and simulation of field conditions. Swell potential is often defined as the percent swell from in situ water content to saturation under a surcharge pressure of 1 psi, whereas in situ heave is often defined as the percent swell from changes in the initial to assumed equilibrium moisture and confining conditions in the field. Increasing degrees of expansion or swell potentials usually correlate with increasing liquid limits and plastically indices.