【摘要】 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。更多还原

【Abstract】 In this paper,taking one mine as the engineering background,different numerical models of roadway intersection were established,and the deformation laws of surrounding rock in different roadway intersections were analyzed.Meanwhile,the security analysis method which both considering shear and tensile damages was used to analyze the security situation of surrounding rocks in roadway intersection.The results show that the surrounding rock deformation of roadway intersection shows different offset degrees to the acute angle side,and the smaller the intersection angle is,the more obvious the offset phenomenon is.Thus,the smaller the intersection angle is,the larger the scope needed to strengthen support in the acute angle side of roadway intersection.Meanwhile,due to the enlargement of disturbance to surrounding rock in roadway intersection,the roof and floor safety coefficient are relatively low in roadway intersection,and the regions where the safety coefficients is less than 1 are greater than other parts of roadway.Moreover,the safety coefficient of corner rock pillar from exterior to interior shows gradient changes,and the safety coefficient of rock mass outside the corner rock pillar is the smallest,which will be damaged first,and then develops gradually to the internal.When the intersection angle is too small,the percentage of damage area of corner rock pillar in the acute angle side is relatively larger,which is not beneficial to the stability of roadway.The results can provide reasonable references to roadway support in similar engineering conditions.更多还原