不同倾角结构面组合下巷道围岩稳定性数值分析

Numerical analysis of the stability of surrounding rock of roadway of composite structure under different angles

不同产状的结构面相互交叉把岩体切割成楔形体,对巷道围岩的稳定性产生影响。利用大型通用有限元软件ABAQUS,对5种不同倾角结构面组合下楔形体的巷道围岩变形破坏特征、巷道周边特征点的应力及位移进行模拟分析。研究结果表明:巷道左右两边的应力和位移呈对称分布;随着组合结构面倾角的增大,巷道底板应力逐渐增大而底板却相反,两帮应力变化没有明显规律;各关键部位的位移变化量都随着组合结构面倾角的增大而增加,其中顶板沉降最为明显;在巷道变形破坏中,两帮与底板的交叉处最先出现塑性,然后向两帮和底板扩展,直至整个巷道变形破坏。模拟结果对有软弱结构面巷道的开挖并采取有效支护措施等提供一定的理论研究和实践参考意义。

The structural planes of different occurrence cross cut rock into wedges,which may influence the sta-bility of surrounding rock.Using the large general -purpose finite element software ABAQUS to analyze five dif-ferent combinations of structural plane angle wedge deformation and failure characteristics of surrounding rock of roadway surrounding feature points of stress and displacement.The results show that the roadway on both sides of the stress and displacement distribution are symmetrical;With the increasing combination of structural plane an-gle,the roadway floor stress increases gradually while the bottom is the opposite,the two sides stress of roadway did not significantly change.The key parts of the displacement quantity increased with the increasing combina-tion of structural plane angle,the most obvious of roof subsidence;In the deformation and failure of roadway,the plastic first appeared between the two sides and bottom,and then extended to the entire roadway deformation and failure.The simulation results can provide some support for theoretical research and practical reference value for tunnel excavation with weak structural planes and take effective measures to support.