论文部分内容阅读
软弱岩体的阶段性、持续性流变,导致软岩巷道围岩深度破坏和支护失效。软岩巷道顶、帮、底三者在围岩系统稳定过程中所起的作用不同,软岩巷道围岩稳定性控制应做到整体性和协调性支护。在分析巷道顶、帮、底相互作用效应基础上,针对软岩巷道强流变四周均表现出大变形的破坏特征,提出了全断面、全支全让O型封闭控制的支护原理。该原理强调,开挖初期就应对软岩巷道顶、帮、底全断面进行强力支护,同时全断面又适时让压,在高阻支护力作用下又能适当释放围岩应力,达到对软岩巷道的整体性和协调性控制。通过力学模型对软岩巷道围岩塑性区范围和表面位移与支护力的作用关系进行了分析计算,得出巷道围岩变形破坏与支护力呈负相关关系。工程实践表明,采用该支护原理有效控制了深部软岩巷道的大变形。研究成果对类似工程实践具有一定的参考借鉴价值。
The phased and continuous rheology of soft rock mass leads to the destruction of surrounding rock depth and failure of support in soft rock roadway. Soft rock roadway roof, top and bottom three in the stability of the surrounding rock system plays a different role in soft rock roadway surrounding rock stability control should be to achieve a holistic and coordinated support. Based on the analysis of the interaction effects of top, middle and bottom of roadway, the deformation characteristics of large deformation of soft rock roadway are shown for all four weeks, and the supporting principle of O-type closed control with full section and full support is put forward. This principle emphasizes that in the early stage of excavation, strong support should be applied to the top, the bottom and the bottom of the soft rock roadway. At the same time, the pressure should be given in full time and the surrounding rock stress should be properly released under the action of high-retaining force. Control of the integrity and coordination of soft rock roadway. Through the mechanics model, the relationship between the plastic zone of surrounding rock in soft rock roadway and the action of surface displacement and support force is analyzed and calculated. The result shows that the deformation and failure of surrounding rock are negatively related to the support force. Engineering practice shows that the support principle can effectively control the large deformation of deep soft rock roadway. The research results have certain reference value for similar engineering practice.