【摘要】 基于OpenSees数值分析平台,建立了单桩-土非线性数值分析模型。模型中考虑了桩身的非线性以及桩-土之间的非线性力学特性,桩-土之间的非线性水平相互作用通过p-y弹簧单元来模拟。结合水平荷载作用下桩-土相互作用拟静力试验结果,对模型的准确性进行验证,并对位于不同地下深度处砂土的水平抗力-位移曲线进行对比分析。结果表明:桩顶水平力-位移滞回曲线及骨架曲线数值模拟结果与试验结果均吻合较好,验证了单桩-土非线性数值分析模型的准确性。此外,在地表以下4倍桩径范围内,砂土-桩水平相互作用力学性能表现出明显的非线性特征,6倍桩径以下深度,呈线弹性状态。更多还原

【Abstract】 Based on the Open Sees numerical analysis platform,we built the nonlinear analysis model for single pilesoil interaction. The nonlinear mechanical behavior of the pile and pile-soil interaction was considered in the model,and p-y spring elements were used to simulate the soil-pile nonlinear horizontal interaction. Combined with quasistatic test results for pile-soil interaction under the action of horizontal load,we verified the accuracy of the model,and compared the hysteretic relations between the soil force and displacement under different pile depth. It is found that the numerical simulated results for the horizontal force-displacement hysteretic curves and skeleton curves tally with the experimental results,verifying the accuracy of the nonlinear analysis model for single pile-soil nonlinear numerical analysis model. The horizontal interaction mechanical behavior of the sand-pile shows obvious nonlinearity within a pile depth less than 4 times of the pile diameter,while it features linearity with a pile depth more than 6 times of the pile diameter.更多还原