本文選題：干濕循環(huán) + 干燥應力�。� 參考：《水利學報》2017年02期

【摘要】：以大連地區(qū)典型粉質(zhì)黏土為研究對象,對經(jīng)歷不同干燥應力歷史的粉質(zhì)黏土試樣在飽和條件下進行了固結不排水三軸剪切試驗。通過對各組試樣固結不排水剪切試驗的應力-應變關系、孔隙水壓力和有效應力路徑等試驗結果的對比分析,探討了干燥應力歷史對粉質(zhì)黏土飽和力學特性的影響。固結不排水三軸剪切試驗結果表明:干濕循環(huán)過程中粉質(zhì)黏土在飽和條件下的力學特性變化與歷史干燥應力有關,歷史干燥應力越大,土體在飽和條件下的力學特性變化越明顯。相同圍壓條件下,干濕循環(huán)試樣的初始剪切剛度比未經(jīng)歷干濕循環(huán)的原始試樣要高,歷史干燥應力越大,初始剪切剛度增長越明顯。隨著歷史干燥應力的增加,干濕循環(huán)試樣的應力-應變曲線逐漸由應變硬化轉(zhuǎn)變?yōu)閼冘浕?孔隙水壓力的發(fā)展由先增加后減小轉(zhuǎn)變?yōu)榭讐撼掷m(xù)增長,有效應力路徑逐漸由"S"型轉(zhuǎn)變?yōu)橄蜃笙路桨l(fā)展。干濕循環(huán)過程引起了土體的不可逆體積壓縮和微裂隙的發(fā)展,進而影響土體的飽和力學特性。
[Abstract]:The undrained triaxial shear tests of silty clay samples with different drying stress histories were carried out under saturated conditions. The effects of drying stress history on saturated mechanical properties of silty clay were investigated by comparing the stress-strain relationship pore water pressure and effective stress path of undrained shear tests. The results of undrained triaxial shear test show that the mechanical properties of silty clay under saturated conditions are related to the historical drying stress, and the greater the historical drying stress is, The change of mechanical properties of soil under saturated condition is more obvious. Under the same confining pressure, the initial shear stiffness of the dry-wet cycle sample is higher than that of the original sample without dry-wet cycle. The greater the historical drying stress, the more obvious the increase of initial shear stiffness. With the increase of historical drying stress, the stress-strain curve of dry-wet cycle samples gradually changed from strain hardening to strain softening, and the development of pore water pressure changed from first increasing and then decreasing to continuous increase of pore pressure. The effective stress path gradually changed from "S" type to the lower left side. The process of dry and wet circulation causes the irreversible volume compression and the development of micro-cracks in soil, thus affecting the saturated mechanical properties of soil.
【作者單位】： 江南大學環(huán)境與土木工程學院;大連理工大學海岸與近海工程國家重點實驗室;
【基金】：國家自然科學基金項目(41572252,51609102) 大連理工大學海岸與近海工程國家重點實驗室開放基金(LP1613)
【分類號】：TU442

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