摘要
为满足煤水共采相似模拟试验材料对物理、力学、水理等性质的特殊要求,以石英砂、重晶石粉和滑石粉为骨料,以C325白水泥为粘结剂,以硅油为调节剂,使用电动平板夯振动压实成型,研发了一种低强度、吸水率可调、遇水不崩解且容易制作的新型煤岩体流固耦合相似材料。通过正交试验、极差分析法和方差分析法获取了材料的各类参数及影响规律,试验结果表明,材料密度可控范围为1.87~2.21 g/cm^(3),单轴抗压强度可控范围为0.75~5.24 MPa,弹性模量可控范围为117.76~505.05 MPa,吸水率可控制在1.85%~23.55%,各参数可通过石英砂含量、重晶石粉含量、水泥含量和硅油含量进行精确调节。采用该材料开展了多煤层开采煤矿地下水库模拟试验,试验中煤柱坝体裂隙发育与现场情况一致,离层裂隙和采空区具有较强的储水效果,而区域垂向裂隙导水效果更明显,验证了该材料的可行性与适用性。
In order to meet the special requirements for physical,mechanical and hydraulic properties of materials for similar simulation test of coal-water co-mining,a new type of fluid-solid coupling similar material of coal rock with low strength,adjustable water absorption,high dispersion resistance in water and easy workability was developed by using quartz sand,barite powder and talc powder as aggregates,C325 white cement as binder,silicone oil as regulator,and electric plate tamper as vibrating compaction molding.Through orthogonal test,range analysis and variance analysis,various parameters and influence laws of materials were obtained.The test results show that the material density can be controlled between 1.87 g/cm^(3)and 2.21 g/cm^(3),the uniaxial compressive strength can be controlled between 0.75 MPa and 5.24 MPa,the elastic modulus can be controlled between 117.76 MPa and 505.05 MPa,and the water absorption can be controlled between 1.85%and 23.55%.Each parameter can be accurately adjusted by the content of quartz sand,barite powder,cement and silicone oil.The material was used to carry out the coal mine underground reservoir simulation test of multi-seam mining,and the crack development of the coal pillar dam body in the test was consistent with the field situation.The separation layer cracks and goaf had a strong water storage effect,while the regional vertical cracks had a more obvious water flowing effect,which verified the feasibility and applicability of the material.
作者
吴宝杨
李鹏
王雁冰
张冰
池明波
WU Baoyang;LI Peng;WANG Yanbing;ZHANG Bing;CHI Mingbo(State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,China Energy Investment Corporation,Changping,Beijing 102209,China;National Institute of Clean and Low-Carbon Energy,Changping,Beijing 102211,China;China Energy Shendong Coal Group Co.,Ltd.,Yulin,Shaanxi 719315,China;School of Mechanic and Civil Engineering,China University of Mining and Technology,Haidian,Beijing 100083,China;Shandong University,Jinan,Shandong 250100,China)
出处
《中国煤炭》
2022年第10期64-73,共10页
China Coal
基金
国家自然科学基金青年基金资助项目(52004011)。
关键词
相似材料
流固耦合
保水开采
正交设计
地下水库
similar materials
fluid-solid coupling
water-preserved mining
orthogonal design
underground reservoir
