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应用自主研发的试验仪对土与结构物相互作用进行试验,试验时使竖向应力和围压达到要求应力值,研究结构物以恒定速率运动时结构物位移对接触面力学特性的影响,进而利用PFC2D对土与结构物在不同位移下相互作用的试验进行数值模拟,分析了土与结构物相互作用时的剪应力变化和土体变形情况。结果表明,接触面剪应力随结构物位移的增加先快速增加,再逐渐趋缓,最后趋于稳定;结构物的剪切作用对接触面土体的影响尤为明显,对远离接触面的土体影响较小,使接触面处土体颗粒从右侧向左侧运动,导致量测圈1内土体堆积发生剪胀,剪应力值增大至140kPa,量测圈3内土体疏松发生剪缩,剪应力值减小至35kPa。
The self-developed tester is used to test the interaction between soil and structure. During the test, the vertical stress and confining pressure are required to reach the required stress. The influence of the structure displacement on the mechanical properties of the contact surface when the structure moves at a constant rate is studied. PFC2D is used to simulate the interaction between soil and structure under different displacements. The shear stress and soil deformation under the interaction between soil and structure are analyzed. The results show that the shear stress at the contact surface increases rapidly with the increase of the displacement of the structure first, then gradually decreases, and finally tends to be stable. The shear effect of the structure on the contact surface soil is particularly obvious. For the soil far away from the contact surface So the soil particles at the contact surface move from the right to the left, resulting in the dilatancy of the soil mass accumulation in the measuring circle 1, the increase of the shearing stress to 140 kPa and the loose soil in the measuring circle 3 Shrinkage, shear stress value is reduced to 35kPa.