采场顶板坚硬条件下覆岩裂隙发育规律试验

Experiment on development law of overlying rock fissures under hard conditions of stope roof

为研究坚硬顶板条件煤层开采后覆岩裂隙发育规律,利用相似模拟试验,对东胜煤田某矿区典型工作面进行试验研究。研究结果表明,采场推进过程中,离层裂隙较断裂裂隙发育要快,并且断裂裂隙总是位于采空区两端和开切眼上方,呈梯形分布;冒落带与裂隙带的分界点高度在50~60 m处;开采工作面推进至65 m时,基本顶初次来压;推进至85、103、122、145 m时,出现4次周期性来压,平均步距为20 m。

In order to study the development law of overburden fractures after coal seam mining under the condition of hard roof,an experimental study was carried out on a typical working face in a mining area of Dongsheng Coalfield by using similar simulation test.The results show that in the process of advancing the stope,the development of separation fractures is faster than that of fault fractures,and the fault fractures are always located at both ends of the goaf and above the open cut hole.The height of the dividing point between the caving zone and the fracture zone is 50~60 m.When the mining face advances to 65 m,the basic roof is pressed for the first time.When advancing to 85,103,122 and 145 m,there are four periodic incoming pressures with an average step distance of 20 m.