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将地下洞室顶板稳定的安全系数定义为岩土体的实际剪切强度与临界破坏时折减后的剪切强度的比值,将顶板塑性区形成潜在的滑移通道作为顶板破坏的判别标准,利用FLAC3D程序与强度折减法分析了地下空区顶板的位移、应力与塑性区分布。研究结果表明:该方法物理意义明确,图形显示清楚,节约计算时间,并且可避免计算收敛失败;顶板安全厚度计算结果与现场调查接近,是可靠的。
The safety factor of roof stability of underground caverns is defined as the ratio of the actual shear strength of rock and soil body to the shear strength after reduction of critical failure. The potential sliding path of plastic zone in roof as the criterion of roof failure, The FLAC3D program and strength reduction method were used to analyze the displacement, stress and plastic zone distribution in the roof of the underground area. The results show that this method has a clear physical meaning, a clear graphical display, a saving of calculation time, and avoids the failure of calculation convergence. The calculation result of roof safety thickness is close to the field investigation and is reliable.