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采用试验方法研究了不同的挤压式边墙表面处理措施对挤压式边墙与面板接触面力学特性的影响规律。针对挤压墙表面的不同措施进行了大型接触面剪切试验,测量了接触面的应力应变关系,分析了主要影响因素。结果表明:采用填料可以减小接触面的峰值剪应力,其中乳化沥青、乳化沥青与砂聚合物、PE膜的效果接近,沥青油毡的减小摩擦效果更为显著。不采用填料或者采用乳化沥青、乳化沥青与砂聚合物、沥青油毡等填料时,接触面的力学特性都表现出类似于理想弹塑性的特性,采用PE膜填料的接触面表现出较明显的应变软化。Clough-Duncan模型能较好地模拟接触面的起始剪切段,但当剪应力较大并接近峰值时模型预测与试验结果表现出一定差距。建议了一个模拟该类接触面主要力学特性的修正理想弹塑性模型,其参数少且易于确定,模型的模拟结果与试验结果也较为符合。
The influences of different extrusion side wall surface treatments on the mechanical properties of the contact surface between the extrusion side wall and the panel were studied by the test method. According to the different measures of squeezing the wall surface, a large contact surface shear test was conducted, the stress-strain relationship of the contact surface was measured, and the main influencing factors were analyzed. The results show that the filler can reduce the peak shear stress at the contact surface. The effect of emulsified asphalt, emulsified asphalt, sand polymer and PE film is similar, and the friction effect of asphalt felt is more obvious. The mechanical properties of the contact surfaces all showed similar elastic-plastic properties when not using fillers or filler such as emulsified asphalt, emulsified asphalt and sand polymer, bitumen felt, etc. The contact surface using PE membrane filler showed obvious strain soften. The Clough-Duncan model can better simulate the initial shear zone of the contact surface, but the model prediction and the test results show a certain gap when the shear stress is large and close to the peak value. A modified ideal elastic-plastic model is proposed to simulate the main mechanical properties of this type of contact surface. The parameters of the proposed model are small and easy to determine. The simulation results of the model are in good agreement with the experimental results.