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为了研究非饱和土在复杂应力作用下的基质吸力变化特性,利用非饱和土真三轴仪,对不同初始基质吸力的非饱和原状黄土进行了常含水率等向固结和不同中主应力比值b应力路径的剪切试验,研究了非饱和原状黄土在真三轴应力条件下的吸力变化特性。研究结果表明:等向固结过程中吸力随着时间的增大而减小,且随着初始吸力和净平均应力的增大,吸力的减小速率越快,吸力变化量越大;等向固结完成后吸力小于初始吸力。剪切过程中吸力随时间的增大呈微小降低或保持不变后较快上升趋势,随着净围压或b值的增大,吸力上升段增长较快,吸力增量越大:剪切完成后吸力大于等向固结完成后的吸力。常含水率真三轴加载作用下黄土的基质吸力变化与净围压和中主应力比值b的不同组合密切相关。
In order to study the variation characteristics of matric suction of unsaturated soils under complex stress, using unsaturated triaxial apparatus, the unsaturated intact loess with different initial substrate suction was subjected to isotropic consolidation and different mid-primary stress ratios b stress path of the shear test to study the unsaturated intact loess under true triaxial stress changes in suction characteristics. The results show that the suction decreases with the increase of time, and with the increase of initial suction and net mean stress, the decrease of suction is faster and the change of suction is bigger. After the consolidation is less than the initial suction suction. During the shear process, the suction increases slightly with the increase of time or keeps rising rapidly, and increases with the increase of the net confining pressure or b value. The increase of suction increases rapidly and the increase of suction increases: shear After the completion of suction greater than the same after the completion of the consolidation of the suction. The change of matrix suction of loess with true water content under true triaxial loading is closely related to the different combinations of net confining pressure and middle principal stress ratio b.