摘要
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 underground cavern＇s roof was defined as the ratio of rock actual shear strength to the failure shear strength after lowing material＇s strength. The forming of potential sllp plane of roof plastic zone was regarded as the criterion of roof failure. Through the FLAC3D software and the method of lowing material＇s strength, the roof＇s displacements, stress and the plastic zones were obtained. The research results show that the calculation method＇s meaning is clear and the result figures are distinct and it can save calculation time and avoid failing of calculation eonstringency. Compared with the calculation results and the spot investigation results, the calculation roof safety thickness is reliable.
出处
《四川建材》
2010年第3期51-53,共3页
Sichuan Building Materials
基金
湖南省自然科学基金资助项目(07JJ6084)
关键词
地下洞室
顶板安全厚度
强度折减法
FLAC3D
underground cavern
roof safety thlckness
method of lowing material＇s strength
FLAC^3D
