深部软岩巷道承载结构耦合分析及其合理控制
发布时间：2018-08-12 12:48
【摘要】：深部软岩巷道具有变形大、地压大以及支护困难等特点,深部软岩巷道的破坏主要是由于围岩与支护体力学特性不耦合引起的,极易从一个部位开始,迅速蔓延至整个支护系统,导致其失去稳定性。所以对深部软岩巷道的承载结构的耦合特性进行研究有着重要的现实意义。本文针对深部软岩巷道,建立支护体与围岩承载结构之间的力学特性模型,利用弹塑性理论,求得围岩在其承载范围内的破碎区、塑性区等范围应力与位移表达式。对其结构进行分析,在围岩的承载位置与参数的基础上,讨论围岩与支护体的强度以及结构参数的影响。从宏观的角度对围岩的承载结构与支护体承载结构之间在刚度、强度以及结构上的耦合关系进行分析。在强度方面,支护力、残余强度对实现围岩承载结构耦合有着重要作用,确定了二次合理支护时间,实现了承载结构在时间和强度上的耦合。在围岩与支护体刚度上,对支护体采用的锚索、锚杆以及注浆等技术手段进行分析,对围岩的强度以及围压、应力状态等进行分析,实现围岩结构与刚度的耦合,达到减小围岩的结构扩展以及提高其自身的强度和承载能力的效果。利用FLAC3D数值模拟,并结合芦岭矿Ⅲ一采区石门实例进行深入研究,探求应力、位移以及塑性等方面的结果分析。经过深入的分析研究,验证了耦合的实际意义。并结合现场的实际观测,验证了本文研究的正确性,对工程实践有着重要的指导意义。
[Abstract]:Deep soft rock roadway is characterized by large deformation, high ground pressure and difficulty in supporting. The failure of deep soft rock roadway is mainly caused by the uncoupling of surrounding rock and supporting physical characteristics, so it is easy to start from one part. Rapidly spread to the entire support system, resulting in its instability. Therefore, it is of great practical significance to study the coupling characteristics of the bearing structure of deep soft rock roadway. In this paper, the mechanical characteristic model between the supporting body and the surrounding rock bearing structure is established for the deep soft rock roadway, and the expressions of stress and displacement in the broken area and plastic zone of the surrounding rock are obtained by using the elastic-plastic theory. Based on the analysis of the bearing position and parameters of the surrounding rock, the influence of the strength of the surrounding rock and the supporting body as well as the structural parameters are discussed. The coupling relations between the bearing structure of surrounding rock and the bearing structure of supporting body in stiffness, strength and structure are analyzed from the macroscopic point of view. In terms of strength, support force and residual strength play an important role in realizing the coupling of surrounding rock bearing structure. The second reasonable supporting time is determined and the coupling of time and strength of bearing structure is realized. In the aspect of the stiffness of surrounding rock and supporting body, the technical means of bolting cable, bolt and grouting are analyzed, and the strength, confining pressure and stress state of surrounding rock are analyzed to realize the coupling of surrounding rock structure and stiffness. It can reduce the structure expansion of surrounding rock and improve its strength and bearing capacity. By using FLAC3D numerical simulation and combining with the example of Shimen in No. 鈪，
本文编号：2179101
[Abstract]:Deep soft rock roadway is characterized by large deformation, high ground pressure and difficulty in supporting. The failure of deep soft rock roadway is mainly caused by the uncoupling of surrounding rock and supporting physical characteristics, so it is easy to start from one part. Rapidly spread to the entire support system, resulting in its instability. Therefore, it is of great practical significance to study the coupling characteristics of the bearing structure of deep soft rock roadway. In this paper, the mechanical characteristic model between the supporting body and the surrounding rock bearing structure is established for the deep soft rock roadway, and the expressions of stress and displacement in the broken area and plastic zone of the surrounding rock are obtained by using the elastic-plastic theory. Based on the analysis of the bearing position and parameters of the surrounding rock, the influence of the strength of the surrounding rock and the supporting body as well as the structural parameters are discussed. The coupling relations between the bearing structure of surrounding rock and the bearing structure of supporting body in stiffness, strength and structure are analyzed from the macroscopic point of view. In terms of strength, support force and residual strength play an important role in realizing the coupling of surrounding rock bearing structure. The second reasonable supporting time is determined and the coupling of time and strength of bearing structure is realized. In the aspect of the stiffness of surrounding rock and supporting body, the technical means of bolting cable, bolt and grouting are analyzed, and the strength, confining pressure and stress state of surrounding rock are analyzed to realize the coupling of surrounding rock structure and stiffness. It can reduce the structure expansion of surrounding rock and improve its strength and bearing capacity. By using FLAC3D numerical simulation and combining with the example of Shimen in No. 鈪，
本文编号：2179101
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