State Key Laboratory of Deep Geomechanics and Underground Engineering, China University of Mining and
Technology (Bejing) School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing)
China National Coal Group Corporation

为解决兴安矿中生代软岩地质条件下的井底车场巷道变形严重,重车线大面积冒落,井筒马头门多次返修仍未稳定的问题,采用地质调查、室内试验和数值模拟等手段,划分了高冒区、严重变形区和一般变形区,分析了巷道以顶沉、帮缩、冒顶为主的变形破坏特征,以及埋深、地质构造复杂、支护不合理等破坏原因,揭示了由离层发育演化为岩板破断的渐进式层状顶冒落机理,然后利用冒落拱的自稳性和围岩自承能力形成上部硐室,采用柔层桁架耦合支护形成下部硐室的上下双硐室稳定耦合控制对策。现场返修加固工程实践表明:提出的兴安矿四水平重车线锚网索-桁架耦合支护设计方案能够有效控制围岩破坏变形,最大两帮移近量30 mm,最大底鼓量27 mm,变形趋于稳定。

In order to solve the problem, such as large deformation and failure of shaft bottom roadway, large area serious roof caving of loaded-car line, instability of horsehead after repeatedly repairing, by means of geological survey, laboratory test and numerical simulation, the soft rock roadway of Xing'an Coal Mine of the Mes ozoic soft rock was divided into high caving zone, serious deformation zone and general deformation zone, the deformation and failure characteristics mainly of roof fali ng, shrinkage at two sides and roof caving were analyzed.The cause of its failure was summarized as follows:roadway was deep; geological structure was complex; orig inal support was irrational.The progressive caving mechanism of layered roof from rock plate separation evolved into breaking was revealed.The double chamber stabili ty coupling control countermeasure, which using the self-stability of caving arch and surrounding self-bearing the ability to form the upper chamber and using the flexibl e layer truss coupling support to form the lower chamber, was put forward.The reinforcement engineering practice showed that the bolt + mesh + anchor + truss support ing design scheme of Xing'an Coal Mine four level loaded-car line effectively controlled the deformation of surrounding rock of roadway, the final convergence of two ro adway sides was 30 mm, the maximum floor heave was 27 mm, the deformation tended to be stable.

国家自然科学基金资助项目(51374214；51479195)；中央高校基本科研业务费专项资金资助项目(2009QL06)；