保水开采固液耦合相似模拟非亲水材料的研制及应用
发布时间：2019-07-06 12:51
【摘要】：本论文基于石圪台煤矿含、隔水层及覆岩地质特征,利用流固耦合相似模拟理论原理研制保水开采非亲水性相似模拟材料。利用研制的非亲水性相似模拟材料模拟浅埋近距煤层重复采动覆岩裂隙发育规律,探索导水通道的导通规律。通过采用物理模拟,对隔水层覆岩移动特征及裂隙发育规律、上下两煤层间覆岩厚度因素对导水裂隙发育的影响方面进行了分析,结合石圪台煤矿水资源测孔的测定结果,验证了非亲水性相似材料物理模拟的可靠性。主要研究成果如下:(1)通过对隔水层力学性能进行测试,隔水层破坏形式为拉伸变坏,其破断具有突然性,在水平拉伸变形ε不超过0.20%~0.24%,隔水层就能够保持完整,具有较强的隔水能力。(2)利用流-固耦合相似原理,研制保水开采流固耦合相似模拟试验中的隔水层材料,寻找合理的非亲水材料配比。选取砂子和石膏作为相似模拟材料的骨料,凡士林和硅油作为胶结剂。研究了材料的水理性,包括亲水性、渗透性、弥合性、流固耦合软化效应以及材料的基本力学性质测试,包括材料的抗压强度和塑性,最终发现了满足隔水层材料的合理配比,即砂子和石膏的重量比例介于6:1~8:1之间,骨料和胶结剂重量比例介于7:1~9:1之间,凡士林和硅油重量比例介于1:1~3:1之间。同时利用砂子、石膏和碳酸钙作为原材料,配制了63种不同配比的基岩相似模拟材料,测定了每种材料的单轴抗压强度、抗拉强度、抗剪强度,丰富了实验室物理模拟采动覆岩运动相似材料的选择种类。(3)采用物理模拟的方法,考虑层采比、采高、上下煤层开切眼错距等因素的变化,模拟了不同开采条件下上下煤层开切眼、采空区中部、停采线侧的覆岩受采动影响垮落、裂隙发育、弯曲下沉等运动规律。同时,测定了上下煤层开切眼侧、采动侧以及停采线侧的导水裂隙发育高度。(4)根据现场水位观测孔观测结果分析,并将结果与运用非亲水性相似材料的物理模拟结果对比,说明物理模拟结果与现场采动导水裂隙发育规律相吻合,达到了实验室物理模拟对非亲水性相似材料的要求。
文内图片：
图片说明：研究技术路线
[Abstract]:Based on the geological characteristics of water-bearing layer and overlying rock in Shigetai Coal Mine, the non-hydrophilic similar simulation material for water conservation mining is developed by using the theory of fluid-solid coupling similarity simulation. The developed non-hydrophilic similar simulation material is used to simulate the fracture development law of repeated mining overlying rock in shallow coal seam, and the conduction law of water diversion channel is explored. By using physical simulation, the movement characteristics and fracture development law of overlying rock in water insulation layer and the influence of overlying rock thickness between upper and lower coal layers on the development of water conductivity fracture are analyzed. Combined with the measured results of water resources hole measurement in Shigetai Coal Mine, the reliability of physical simulation of non-hydrophilic similar materials is verified. The main research results are as follows: (1) by testing the mechanical properties of the water insulation layer, the failure form of the water insulation layer is tensile deterioration, and its breaking is sudden. When the horizontal tensile deformation is not more than 0.2% 鈮，
本文编号：2511025
文内图片：
图片说明：研究技术路线
[Abstract]:Based on the geological characteristics of water-bearing layer and overlying rock in Shigetai Coal Mine, the non-hydrophilic similar simulation material for water conservation mining is developed by using the theory of fluid-solid coupling similarity simulation. The developed non-hydrophilic similar simulation material is used to simulate the fracture development law of repeated mining overlying rock in shallow coal seam, and the conduction law of water diversion channel is explored. By using physical simulation, the movement characteristics and fracture development law of overlying rock in water insulation layer and the influence of overlying rock thickness between upper and lower coal layers on the development of water conductivity fracture are analyzed. Combined with the measured results of water resources hole measurement in Shigetai Coal Mine, the reliability of physical simulation of non-hydrophilic similar materials is verified. The main research results are as follows: (1) by testing the mechanical properties of the water insulation layer, the failure form of the water insulation layer is tensile deterioration, and its breaking is sudden. When the horizontal tensile deformation is not more than 0.2% 鈮，
本文编号：2511025
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