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Hydromechanical behavior of unsaturated expansive clay under repetitive loading

Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1136-1146页

作者： Ahmed M.Al-Mahbashi Mosleh A.Al-Shamrani Mohammad F.Abbas Bugshan Research Chair in Expansive Soils Department of Civil EngineeringKing Saud UniversityRiyadh11421Saudi Arabia Civil Engineering Department Prince Sattam bin Abdulaziz UniversityAl-Kharj11942Saudi Arabia Soil Mechanics and Geotechnical Engineering Research Institute Housing and Building National Research Center(HBRC)Giza11511Egypt

Compacted layers of expansive soils are used in different engineering projects,such as subgrades,engineered clay barriers,and buffers for radioactive waste *** layers are exposed to a variety of stresses and wetting conditions during field *** between hydraulic and mechanical repeated loading provides insight understanding to the induced progressive deformation of expansive *** study was conducted to investigate the hydromechanical behavior of unsaturated compacted expansive clay under repeated loadingeunloading(RLU)*** series of onedimensional(1D)oedometer tests were conducted under controlled matric suction up to 1500 kPa using the axis translation technique(Fredlund soil-water characteristic curve device,SWC-150).The first test series was carried out at different levels of controlled matric suction for non-repeated loading eunloading(NRLU)*** cycles were applied in the second test series at different repetitivestress levels and under different levels of matric *** results indicated increasing axial wetting strainε_(a)(s),axial swell pressure ss(s),compression index C_(c)(s),and swell index C_(s)(s)with suction *** estimated loadecollapse(LC)curves obtained from NRLU series(LCN)and RLU series(LCR)indicated increasing yield stress sy(s)with increasing *** is attributed to the developed apparent cohesion between soil particles,which in turn rigidifies the material *** repetitive loading induced a notable reduction of compression index C_(c)(s)at the same level of suction,whereas swell index C_(s)(s)seems to be independent of repetitive ***,repetitive loading exceeding initial yield stresses results in plastic hardening and,hence,enlargement of yield stress locus(*** curve).

关键词： Expansive clay Repetitive loading Suction Hydromechanical behavior loadecollapse curve

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