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以某矿井为工程背景,建立不同交叉情况的数值模型,分析了不同交叉情况下的巷道围岩变形规律,并且引入了同时考虑压剪破坏和拉伸破坏的单元安全计算方法来分析交叉段围岩的安全状况。结果表明:巷道交叉段的围岩变形有向锐角一侧偏移的现象,交叉角度越小偏移程度越明显。交叉角度越小,交叉段主巷锐角侧需要进行加强支护的范围越大。由于巷道交叉扩大了围岩扰动,巷道交叉段的顶、底板安全系数都比较低,安全系数小于1的区域要大于巷道其他部位。而拐角岩柱的安全度则由外而内呈梯度变化,拐角岩柱外侧的岩体安全系数最低,将最先发生破坏,然后逐渐向内部发展。交叉角度过小时,锐角侧拐角岩柱破坏面积所占比率较大,不利于巷道稳定性。所得结果可以为类似条件下的巷道支护提供依据。
Taking a mine as the engineering background, a numerical model of different cross conditions is established, and the deformation laws of the surrounding rock of the roadway under different crossings are analyzed. A unit safety calculation method considering both the compression shear failure and the tensile failure is introduced to analyze the cross section Rock safety status. The results show that the deformation of the surrounding rock at the cross section of the roadway is offset to the acute one, and the smaller the crossing angle is, the more obvious the deflection is. The smaller the crossing angle is, the larger the area that needs to be strengthened to support the acute angle side of the crossing main lane. Due to the enlargement of the surrounding rock disturbance caused by the crossing of the roadway, the safety coefficient of the roof and floor of the intersection of the roadway is relatively low, and the area with the safety factor less than 1 is larger than the other parts of the roadway. However, the safety of corner rock columns changes from outside to inside with a gradient. The rock mass safety coefficient outside the corner rock columns is the lowest, and will be destroyed first and then gradually to the interior. When the crossing angle is too small, the ratio of the damaged area of the rock column at the acute corner side is larger, which is not conducive to the stability of the roadway. The results can provide basis for roadway support under similar conditions.