巷道交岔点合理支护参数正交优化

Orthogonal Optimization of Reasonable Reinforcement Parameters for Roadway Intersection

为了寻求交岔点巷道合理的支护参数,基于正交设计试验,采用数值模拟软件Flac^(3D)对不同围岩强度下交岔点巷道的支护参数进行了数值模拟分析,并对试验结果进行了极差和方差分析。研究表明:巷道交岔点应选取在侧压系数小于1的围岩内;围岩强度较低时,巷道支护参数的变化对围岩稳定性影响较大;锚杆支护可有效改善交岔点的稳定性,锚索在巷道围岩变形大且塑性区厚度小于锚索长度时支护效果才会比较明显。

In order to find reasonable reinforcement parameters for roadway intersection,based on orthogonal de- sign test,a simulation analysis was taken on reinforcement parameters for roadway intersection under different rock mass strength by FLAC^(3D),and the outcome data of the test were analyzed by range analysis and variance analysis.The results show that roadway intersection should be located at the place where lateral pressure coefficients are below 1; variety of reinforcement parameters have important influence on stability of roadway intersection when the strength of rock mass is lower.The bolting reinforcement can improve stability of roadway intersection effectively,and affection of anchor is obvious only when the rock mass deformation is large and the thickness of plastic zone is shorter than the length of anchor.