破碎回采巷道围岩注浆加固机理与工艺研究

发布时间：2019-04-23 09:29

【摘要】：在破碎围岩中掘进巷道时,围岩原有的平衡状态会受到破坏，节理裂隙会进一步发育，在回采时围岩会出现变形、松动甚至破坏等现象，直接影响了回采工作的进行。当采用与巷道情况不相适应的支护手段时，往往不能满足现场的支护要求,无法维持巷道的稳定，随着回采工作的进行还会进一步引起巷道围岩的变形破坏，使巷道支护更加困难。对于破碎围岩巷道,仅采用传统的支护方式已经越来越难以满足其复杂地形的支护工作和巷道维护要求。通过采用注浆的方法来加固围岩，可以改善巷道围岩的力学性能，，增强围岩自身的承载能力，有效改善围岩破碎状况，保持巷道围岩稳定。本文采用理论分析、实验室实验以及数值模拟等相结合的方法主要做了以下研究：（1）通过实验室实验的方法测定了水泥-水玻璃浆液的凝胶时间和浆液结石体的单轴抗压强度，研究了水泥浆液、水泥-水玻璃浆液的扩散规律。针对不同程度的破碎围岩巷道，进行了注浆材料的选择，设计注浆参数和注浆工艺。（2）在充分研究巷道地质条件的基础上，通过数值模拟软件模拟分析，分析了巷道开挖前后巷道围岩应力和位移情况，分析了回采期间巷道应力、位移情况以及巷道塑性变化破坏情况，并对注浆方案做出了评价。在总结注浆加固机理和破碎围岩巷道特征的基础上,通过对巷道围岩工程地质条件分析,确定了81011工作面回风巷的注浆工艺，采用注浆和注浆锚索相结合的注浆工艺。（3）81011工作面回风巷随回采工作的进行，巷道围岩破碎严重。通过对巷道进行注浆加固，巷道顶底板和两帮应力集中明显减小，位移量比未注浆前大大降低，有效的控制巷道围岩的变形,阻止了破碎顶板冒落,为锚杆支护打下了良好的基础。
[Abstract]:When tunneling roadway in broken rock, the original equilibrium state of surrounding rock will be destroyed, the joint crack will develop further, the deformation, loosening and even failure of surrounding rock will appear in the mining process, which will directly affect the work of mining. When adopting the supporting method which is not suitable to the condition of the roadway, it is often unable to meet the requirements of the site support, and cannot maintain the stability of the roadway, and the deformation and destruction of the surrounding rock of the roadway will be further caused with the development of the mining work. Make the roadway support more difficult. For broken surrounding rock roadway, it is more and more difficult to meet the requirements of complex terrain support and roadway maintenance only by using traditional supporting method. By means of grouting to strengthen the surrounding rock, the mechanical performance of the surrounding rock can be improved, the bearing capacity of the surrounding rock can be enhanced, the broken state of the surrounding rock can be effectively improved and the surrounding rock stability can be maintained. This paper uses theoretical analysis, The combined methods of laboratory experiment and numerical simulation are as follows: (1) the gel time of cement-water glass slurry and uniaxial compressive strength of slurry are measured by the method of laboratory experiment, and the experimental results are as follows: (1) the gel time of cement-water glass slurry and the uniaxial compressive strength of slurry are measured by laboratory experiment. The diffusion law of cement paste and cement-water glass slurry was studied. According to different degrees of broken surrounding rock roadway, the selection of grouting material, the design of grouting parameters and grouting technology were carried out. (2) on the basis of fully studying the geological conditions of roadway, the stress and displacement of surrounding rock of roadway before and after excavation are analyzed by numerical simulation software, and the stress of roadway during mining is analyzed. The displacement and the damage of the plastic change of the roadway are also discussed, and the grouting scheme is evaluated. On the basis of summarizing the mechanism of grouting reinforcement and the characteristics of broken surrounding rock roadway, by analyzing the engineering geological conditions of surrounding rock of roadway, the grouting technology of return air roadway in 81011 working face is determined, and the grouting technology combining grouting with grouting anchor cable is adopted. (3) with the work of mining, the surrounding rock of the roadway is broken seriously in 81011 working face. By means of grouting reinforcement, the stress concentration of the roof and floor and the two sides of the roadway are obviously reduced, and the displacement is greatly lower than that before the grouting. The deformation of the surrounding rock of the roadway is effectively controlled and the falling of the broken roof is prevented. It lays a good foundation for bolt support.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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