第三系软岩巷道变形破坏特性及耦合控制对策研究

On the deformation and failure characteristics of the Tertiary soft rock roadway and coupling control measures

本文分析了我国第三系软岩巷道变形破坏特性,对锚网索-双层桁架支护技术在柳海矿的成功实践进行了深入研究。现场调查结果显示,柳海矿第三系软岩巷道破坏范围广、返修率高、破坏形式复杂且呈现非线性大变形现象。通过综合分析本区的高应力节理化强膨胀复合型变形力学机制,提出锚网索-双层桁架耦合支护体系,即充分利用桁架全方位立体耦合受力特性,结合锚网索从时间和空间上控制围岩非线性大变形,使巷道围岩受力更加均衡合理。锚索可以调动深部坚硬围岩强度,而双层桁架以其强度高、整体性强、协同均匀性好和立体化接触受力特性承载围岩流变荷载并相互传递,使巷道深部围岩高应力能够得到有效转化。工程实践表明,该技术得到成功运用,保证了巷道底板稳定性。

Based on the analysis of the deformation and failure characteristics of the Tertiary soft rock roadway in China, the further research on the successful supporting practice of bolt-net-cable-double-layer truss in Liuhai coal mine has been carried out . The result of the field investigation shows that the tertiary soft rock roadway has been damaged in wide range with high repair rate, complex damage forms and nonlinear large deformation.The bolt-net-cable-double-layer truss support technology is put forward based on the comprehensive study of the compound deformation mechanism of high stress, jointing and intense swelling soft rock. Because of the characteristic of the coupling stress, the roadway deformation can be controlled effectively in time and space with the aid of bolt-net-cable, and it is also possible for the deformation and stress in the surrounding rock to become uniform. The anchor cable can take full advantage of the strength of deep hard surrounding rock, while the double layer truss can bear the rheological load of soft rock with high strength, wholeness, cooperativity and uniform contact-ed stress, making possible the effective transformation of high stress in the deep surrounding rock of roadway. Engineering practice shows that the new technology has been successfully applied to ensure the stability of roadway.