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土与混凝土桩的接触面力学行为随土的含水量变化。进行了17%、20%、24%共3组含水量的土与混凝土桩接触面室内单剪试验,每组试验考虑5个法向应力。试验结果表明,在含水量一定时,接触面强度破坏仍遵循摩尔-库仑破坏准则;接触面的抗剪强度、摩擦角随含水量的增大非线性单调减小,粘聚力则先增大后减小。随着含水量和法向应力的增大,接触面的破坏位置逐渐由几何接触界面向土体内部过渡。法向应力较小时,含水量对接触面应力应变曲线的初始段影响不大。试验结果可供相关工程数值分析参考。
The mechanical behavior of the contact surface between soil and concrete piles changes with the soil water content. A single shear test was conducted on the interface between soil and concrete pile with water content of 17%, 20% and 24% respectively, and five normal stresses were considered in each group. The experimental results show that the strength of the contact surface still follows the Mohr-Coulomb failure criterion when the water content is constant. The shear strength and friction angle of the contact surface decrease monotonously with the increase of water content, while the cohesion increases first After the decrease. With the increase of water content and normal stress, the damage location of the contact surface gradually transitions from the geometric contact interface to the interior of the soil. When the normal stress is small, the water content has little effect on the initial section of the stress-strain curve of the contact surface. The test results are available for numerical analysis of relevant projects.