承压水作用下切顶卸压对煤层底板破坏深度影响的试验研究
Experimental Study on Effect of Reducing Mine Pressure by Cutting Roof Strata on Failure Zone Depth of Coal Seam Floor Under Confined Aquifers
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摘要: 为研究承压水作用下煤层顶板切顶卸压对煤层底板破坏深度的影响,以二维相似模拟试验台为基础,研制了简易底板承压水施加装置,并运用动态应变仪和全站型电子测距仪分别进行应力和位移监测。试验模拟了切顶卸压和常规开采条件下的煤层底板破坏深度情况,得到了2种不同条件下围岩应力场的变化规律和底板破坏深度值。试验结果显示:切顶卸压和不切顶卸压条件下,在近水体处的裂隙导升带破坏区别不大;监测到的煤层底板应力变化规律相似,但扰动强度不同。不切顶条件下的底板破坏深度比切顶条件下大,切顶卸压在一定程度上能够减小底板破坏深度。Abstract: To study the effect of reducing mine pressure by cutting roof strata on the depth of floor strata failure zones above the confined aquifers, a simple confined aquifer simulation device was developed based on a two-dimensional similar simulation test bed. Stress and displacement were respectively monitored by dynamic strain gauge and total station electronic distance meter. The variation of stress field in surrounding rock and the failure depth of floor strata were got under the conditions of both cutting roof strata and conventional mining conditions. The test results show that there is little difference in fracture conduction zone damage near water body between the two conditions, and the variation trend of the monitored stress is similar, while the stress disturbance intensity is different. The floor failure depth without roof cutting is greater than that under roof cutting, which indicates that the reasonable design of roof cutting can reduce the failure depth of floor to a certain extent.
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Keywords:
- confined water /
- similar test /
- cutting roof /
- pressure relief mining /
- fracture depth of floor
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