采动影响下巷道支护研究

发布时间：2018-06-18 13:02

本文选题：支护参数 + 锚杆支护　；参考：《内蒙古科技大学》2015年硕士论文

【摘要】：我国的煤炭产量90%来自地下开采，由于巷道的开挖诱发了支承压力，支承压力会导致一系列物理过程的发展，应力集中超过了围岩强度，围岩容易破碎、导致失稳、造成开采停顿。尽管对采动影响下巷道支护做了大量研究，但是煤巷地质条件复杂、多变，对锚杆支护作用机理有待系统的深入研究。有必要对采动应力场的分布特征及其对巷道的影响做出分析，通过工程类比法、理论分析法、FLAC3D数值模拟法等分析确定合理的支护设计，，对围岩进行有效控制，使巷道达到稳定。本文以保德矿回采巷道为背景，对采动影响下巷道支护进行研究。主要内容和成果有：首先，在各种形式矿山压力的复杂显现过程中，较强的扰动引起地层的运移，这时采动支承压力会对回采巷道造成强烈影响。使用FLAC3D软件，分析受到采动影响在回采空间周围形成的支承压力的特征，并得到合理的护巷煤柱尺寸。合理的护巷煤柱可以减少巷道的有害变形，减少巷道的维护，减少煤炭浪费，使巷道布置得到优化。其次，在不考虑原岩应力条件下，运用FLAC3D软件，模拟分析预应力的扩散规律。由于预紧力的作用，在围岩体锚固范围内形成预应力场。在多根锚杆作用下，锚杆预应力场彼此重叠、相互叠加形成压缩带，具有承载作用。运用FLAC3D软件模拟分析预紧力锚杆在不同间、排距情况下对岩体施加应力场的影响范围。最后得出了合理的支护密度，使围岩达到稳定状态。支护是为加强回采巷道围岩的稳定性，使其保持承载力，目的是利用围岩体的固有强度，成为自载结构，发挥岩体的自载能力。锚杆（索）对围岩施加的预紧力属于主动支护，对围岩有加固作用。通过工程类比法和理论分析法对保德煤矿回风顺槽的支护参数进行设计，并运用FLAC3D软件模拟巷道在采动影响下的应力云图、位移云图、塑性区等，可以看出设计的支护参数是合理有效的，能满足工程实际要求。
[Abstract]:90% of China's coal production comes from underground mining. As the excavation of the roadway induces the support pressure, the support pressure will lead to a series of physical processes. The stress concentration exceeds the strength of the surrounding rock, and the surrounding rock is easily broken, resulting in instability and mining pause. Although a lot of Research on roadway support under the shadow of mining action, the coal roadway geological strip is made. It is necessary to analyze the distribution characteristics of the mining stress field and its influence on the roadway. It is necessary to analyze the distribution characteristics of the stope stress field and its influence on the roadway. Through the analysis of the engineering analogy method, the theoretical analysis method and the FLAC3D numerical simulation method, the reasonable support design is determined, and the surrounding rock is effectively controlled so that the roadway can be stabilized.
Based on the background of the mining roadway in Baode mine, this paper studies the roadway support under the influence of mining. The main contents and results are as follows: first, the strong disturbance causes the movement of the strata in the complicated process of various forms of mine pressure, and the support pressure of the mining will have a strong influence on the roadway. The FLAC3D software is used to analyze the effect. It can reduce the harmful deformation of the roadway, reduce the maintenance of the roadway, reduce the coal waste, and optimize the layout of the roadway. Secondly, the FLAC3D software is used to simulate and analyze under the conditions of the original rock stress. The prestress diffusion law. The prestress field is formed within the anchorage range of the surrounding rock due to the effect of pre tightening force. Under the action of multiple anchor bolts, the anchorage stress field overlaps each other and superposes each other to form a compression zone, which has the bearing capacity. The stress field of the pretension bolt is simulated and analyzed by the FLAC3D software. Finally, the reasonable support density is obtained to make the surrounding rock stable. The support is to strengthen the stability of the surrounding rock and keep the bearing capacity. The purpose is to make use of the inherent strength of the surrounding rock body to become a self loaded structure and give full play to the self loading capacity of the rock mass. The rock has reinforcement.
Through the engineering analogy method and the theoretical analysis method, the supporting parameters of the return trough of the Baode coal mine are designed, and the FLAC3D software is used to simulate the stress cloud map, the displacement cloud map and the plastic area under the influence of the mining. It can be seen that the supporting parameters of the design are reasonable and effective, and the actual requirements of the project can be full.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

【参考文献】