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宝山矿西部2#矿体为深部难采矿体,采用废石胶结充填法回采。为确保其回采的安全,采用RMT-150B岩石力学试验机,对7种配比的废石胶结充填体在不同龄期的抗压强度进行了测试,利用龄期为28 d的废石胶结充填体的力学参数对试验采场进行了充填法回采的FLAC3D模拟,根据模拟结果选用C组配比的废石胶结充填体对该矿试验采场进行了充填,同时还对其进行了应力测试。研究结果表明:水灰比和灰砂比是控制废石胶结充填体抗压强度的关键因素;龄期为28 d的C组废石胶结充填体的抗压强度大于2 MPa;采空区围岩的最大主应力和竖向最大位移随废石胶结充填体强度的增加而减小,而最小主应力则与之相反;选用C组配比的废石胶结充填体的试验采场的应力测试结果与模拟结果吻合良好,能有效地控制该试验采场深部开采的地压。
The No. 2 ore body in the west of Baoshan Mine is a deep difficult-to-mining body, and is reclaimed by the cement-filling method of waste rock. In order to ensure the safety of the mining, the RMT-150B rock mechanics testing machine was used to test the compressive strength of 7 kinds of waste rock cemented cements at different ages, the age of 28 days According to the simulation results, the waste rock cemented filling body with the matching ratio of C was used to fill the test stope of the mine, and the stress test was also carried out on the stope. The results show that the water-cement ratio and lime-sand ratio are the key factors to control the compressive strength of cement-bonded post-mortar cements. The compressive strength of the cement-cemented backfill of group C with the age of 28 days is more than 2 MPa. The maximum principal stress and vertical maximum displacement of rock decreased with the increase of the strength of the cement-cemented filling body, while the minimum principal stress was the opposite; the stress test The results are in good agreement with the simulation results and can effectively control the ground pressure in the deep mining of the test stope.