地下水位下降对井壁破坏的影响分析

在用“２Ｄ σ”软件对所建模型进行数值计算的基础上， 分析了因采煤引起淮北矿区下部含水层水位下降而对井壁产生的影响。其表现为： 下部含水层水位下降将引起地层压缩沉降； 地层与井壁间产生附加应力， 并在基岩下部产生应力为零的中性点； 轴向应力由小变大； 当第一含水层和下部含水层同时有水位下降时， 也有类似的规律。计算结果与淮北诸矿井壁变形位置及变化状况基本相符， 因此在此基础上进行的井筒优化设计具有实际指导意义

ANALYSIS OF SHAFT LINING DEFORMATION CAUSED BY AQUIFER'S HEAD DROPPING

Through building the model and the numerical simulation with “2D\|σ” software, the authors analyze the effect of the aquifer's head dropping on the damage of the shaft lining of the mining shafts in Huaibei mines. The result shows that the drop of the forth confined aquifer's head causes aquifer compression and additional stress between stratum and shaft lining, and leads to neutral point at the lower part of the basic rock and in this point the stress is zero, and the axial stress changes from smaller to bigger. The result is similar when the levels of phreatic water and the forth confined aquifer drop synchronously. The deformation positions of the shaft lining calculated by the method metioned above are much the same as the real situations, so the model can be applied to shaft lining optimal design.