节理裂隙发育围岩对立井井壁受力的影响研究

Study on the influence of shaft lining stress of the jointed rock mass

因基岩段岩层节理、裂隙等弱面较为发育,致使在对基岩段立井井壁和围岩稳定性研究中很难全面考虑各弱面对稳定性的影响,因此通过引入遍布节理模型,同时考虑岩块和节理属性,使研究更加符合岩体状态及工程实际。选取某矿井基岩段立井作为工程实例,对比分析井壁与围岩在莫尔-库伦模型和遍布节理模型两种条件下的位移、应力状态发展情况,在引入遍布节理模型后,井壁位移值增长较显著,围岩最大主应力值有一定程度增加。同时选取三种不同倾角的遍布节理弱面,研究遍布节理弱面的倾角对围岩变形的影响,再引入模拟实验进行对比验证。研究结果表明,遍布节理弱面对立井井壁和围岩稳定性有较大影响。当其倾角越大时,影响越大,应力集中现象比较明显。

Because the bedrock rock joints, fissures and other weak face more development, and makes it difficult to consider the effects of all these types of weak planes in the bedrock of vertical shaft lining and surrounding rock stability. A mine shaft of bedrock section is taken as an example for numerical analysis,and the displacement and stress of the surrounding rock are analyzed by applying the MohrCoulomb model and the ubiquitous-joint model, respectively, in FLAC3D. For the ubiquitous-joint model, the horizontal displacement of the shaft lining and the maximum principal stress of surrounding rock are greater than those by Mohr-Coulomb model. At the same time selection of ubiquitous-joint weak planes with three different dips, Study of effeeting of ubiquitous-joint weak planes with three different dips on surrounding rock. Introduction of simulation experiments for cotnaparison and verification. The results show that ubiquitous-joint weak plane significantly affects the deformation of the surrounding rock mass,and the effect is maximal when the dips of ubiquitous-joint weak planes is large.