动压影响下盘区胶带机头硐室破碎围岩加固技术

详细调查成庄矿二盘区胶带机头硐室生产地质条件、支护现状和变形破坏特征；运用FLAC^3D建立三维数值模型，分析硐室随着相邻工作面的推进三维空间围岩应力场分布状况，以及不同尺寸保护煤柱条件下工作面采动对巷道群应力集中的影响，揭示了原有锚杆支护失效原因。针对动压影响硐室变形实质是围岩内部产生裂隙及其扩展、张开的特点，提出先注浆充填修复围岩结构完整，增强围岩自身承载能力，后采用强力锚索支护控制锚固区围岩的二次离层，在锚固区内形成次生承载层提高其围岩稳定性的加固原理。基于上述原理设计加固方案应用于盘区胶带机头硐室巷修工程，试验表明:采用围岩表面喷浆封闭堵漏和浅深孔注浆相结合的加固技术，不但有效控制了胶带机头硐室的失稳破坏，还限制了围岩的长期流变，从而确保了硐室的长期稳定。

Reinforcement technology of fractured surrounding rock in panel conveyor head chamber under dynamic pressure

Detailed investigation of geological conditions and the supporting conditions，failure characteristics in No.2 panel conveyor head chamber.A three-dimensional numerical model was established by using FLAC^3D to analyze the distribution of the stress field in the three-dimensional space of the chamber along with the adjacent working face，and the influence of working face mining on stress concentration of roadway group under different sizes of protective pillars.The failure reason of original bolt support was revealed.In view of the effect of dynamic pressure on chamber deformation was the characteristics of significant separation，sliding and opening of the primary structure surface，the first grouting to improve the integrity of the broken rock and enhance the bearing capacity of the surrounding rock，and then use the strong anchor cable support to control the two layers of the surrounding rock in the anchorage area and to form secondary bearing layer to improve its surrounding rock in the anchorage zone.Based on the above principle，the design and reinforcement scheme was applied to the repair engineering of the belt belt conveyor head chamber.The test shows that the reinforcement technology，which combines the sealing of the surrounding rock surface with the sealing of the leakage and the shallow deep hole grouting，not only effectively controls the instability failure of the belt head chamber，but also restricts the long-term rheology of the surrounding rock，thus maintaining the chamber long term stability.