基于流变试验的软岩巷道变形破坏机理分析及支护技术

软岩巷道变形破坏是煤矿深部开采软岩巷道支护的重大灾害之一。基于刘庄矿区深部泥岩现场三轴流变试验和数值模拟,对软岩巷道变形破坏机理及支护技术进行了分析,采用最小二乘法中的阻尼最小二乘法(Marquardt法)逐次线性化的间接方法,利用非线性流变力学模型,拟合得到泥岩蠕变本构方程,分析得出刘庄矿区深部软岩巷道的合理支护方式：(1)采用反底拱和全封闭的施工方式,减小巷道的维修工作量；(2)顺层掘进的重要峒室,其锚杆的方位应尽可能和层面垂直,将弱面串联成一体；(3)底板锚注控制底板大变形。

Based on creep test of soft rock roadways deformation failure mechanism analysis and supporting technology

The soft rock deformation and failure are the disasters in the deep mining of coal mine soft rock supporting. Based on the liuzhuang mine deep mudstone triaxial rheological test and numerical modeling.The deformation failure mechanism of soft rock tunnel excavation and supporting technology is analyzed.In the least square method, the damped least square method (Marquardt method) is applied to the indirect method and the creep constitutive equation is obtained by using the nonlinear rheological model,which obtained the reasonable support mode of deep soft rock tunnel excavation of the liuzhuang mine: (1) Adopting the way of bottom arch and construction to reduce the roadway maintenance workload; (2) In order to making weak surface series into a whole the bolt bearing of the important chamber of bedding drivage should be vertical and leve; (3) The backplane anchor note can control large deformation of floor.