煤矿立井井壁与围土相互作用的实验研究

Experiment Study on Interaction between Shaft Lining and Soil

在自行改造、加工的高应力单剪仪试验系统上对饱和砾砂、粗砂、中砂、细砂同混凝土界面的剪切特性进行了一系列试验研究.通过对试验数据的分析发现,高应力下界面的本构关系可以采用非线性弹性-理想塑性模型,非线性弹性阶段与双曲线模型较一致,界面的强度准则符合无粘聚力的库仑公式,在此基础上导出了界面单元的弹塑性矩阵.对包括弹性和塑性2个变形阶段的情况,采用初应力法得到了修正的弹塑性矩阵.

a series simple shear tests under high stress of interface among saturated gravelly sand, saturated coarse sand, saturated medium sand, saturated fine sand concrete was carried out on the modified and manufactured simple shear system. The analysis of experimental data shows that a nonlinear elastic-perfect plastic model can simulate the constitutive law of the interface under high stress and that the nonlinear elastic stage is in accordance with the hyperbolic model meantime, the strength criterion of interface is well in accordance with coulomb＇s law. On the basis, the elastic-plastic matrix of interface element are established. Aiming at the situation containing the elastic and plastic phase, the modified elastic-plastic matrix is received with the initial stress method.