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العنوان
Laboratory investigation of the influence of water sensitive soils on the foundation of structures in Egypt /
المؤلف
El-Kinawy, Mohamed El-Kinawy El-Said.
هيئة الاعداد
باحث / محمد القناوى السعيد القناوى
مشرف / عادل كامل جبر
مشرف / رفيق بالعربى
مشرف / محمد جمال السيد عرب
الموضوع
Municipal water supply. Structural design. Soils. Water-supply.
تاريخ النشر
2019.
عدد الصفحات
online resource (230 pages) :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الهندسة المدنية والإنشائية
تاريخ الإجازة
1/1/2019
مكان الإجازة
جامعة المنصورة - كلية الهندسة - الهندسة الإنشائية
الفهرس
Only 14 pages are availabe for public view

from 257

from 257

Abstract

Soils in vadose zone are greatly affected by seasonal variation of moisture and suction. This seasonal variation in moisture has great effect on soil especially those water sensitive soils. Swelling soils are those experience increase in volume due to suction stress reduction and may result in distresses and cracks for structures. This dissertation is an effort to understand the effects of suction on swelling local soils and ways to improve the behavior of such soils using ecofriendly additives.The shear strength of such soils is greatly affected by the moisture and suction levels and may affect the overall stability of the structure founded on these soils. Several techniques have been proposed in the literature to measure the shear strength of unsaturated soils using sophisticated devices that control suction and volume change. These devices are rather complicated and expensive. In this research an attempt to use both triaxial and direct shear device to predict the soil shear strength with the use of the Soil Water characteristic curve (SWCC) as tool to predict the suction. The Filter paper method was used to construct SWCC at high suction levels usually encountered in arid and semi-arid regions. The research started with the characterization of the collected clay by performing a series of routine testing. The volumetric behavior of the investigated soils were investigated using three different techniques, namely free swell (FS) test, loaded swell (LS) test and constant volume (CV) test. The comparison between the three methods revealed that the swelling pressure from LS and FS tests is always higher than the swelling pressure from CV test. The unsaturated soil shear strength at different level of suction was determined using the direct shear test and unconfined compressive strength. Prediction models proposed in the literature were used to validate the possibility of using such models to predict the shear strength using total stress approach.