基于断层弱化法特大断面巷道围岩稳定性研究

Stability of surrounding rock of super-large section roadway based on fault weakening method

以断层破碎带某特大断面巷道为研究对象,运用FLAC3D数值模拟软件基于断层弱化法研究断层对特大断面巷道围岩稳定性的影响。研究结果表明:在断层参数取值范围内,容重和抗拉强度对模拟结果几乎没有影响,体积模量和剪切模量对模拟结果的影响较大。特大断面巷道与断层的距离小于1.5倍洞径时,断层对其稳定性影响较大,特大断面巷道位于断层下盘0.5倍洞径时,顶板沉降最大,为-11.297mm;位于断层上盘0.5倍洞径时,底板鼓起最大,为12.929mm。

In this paper, the study on the stability of surrounding rock of super-large section roadway is conducted by using FLAC3D numerical simulation software based on the fault weakening meth- od. The results show that in the range of fault parameters,volume weight and tensile strength have almost no influence on the simula- tion results,but bulk modulus and shear modulus have a great in- fluence on the simulation results. When the distance between su- per-large section roadway and fault is less than 1.5 diameters,the fault has a great influence on it. When the super-large section road- way is located in the footwall of fault at 0.5 diameter,the roof set- tlement is maximum at - 11. 297 mm and when the super-large section roadway is located on the hanging wall of fault at 0. 5 diam- eter,the floor heave is the largest at 12. 929 mm.