上横山多层页岩矿床低强度相似材料试验模型研究

通过相似配比试验，研制不同砂胶比的低强度相似材料，分析了砂胶比和胶结材料中水泥含量对其物理和力学性质的影响及其变化规律。根据上横山多层页岩矿床赋存条件和相似模拟试验要求，确定了3个可行的、有效的相似材料配比，结合相似模拟条件构筑了多层页岩矿床相似材料模型。试验结果表明，相同砂胶比的低强度相似材料的密度、抗压强度、弹性模量和泊松比均随胶结材料中水泥含量的增加而增大；密度、孔隙率、弹性模量和泊松比在低砂胶比条件下具有更小的波动性。进一步研究发现，选择的低强度页岩相似材料实际相似常数与设计相似常数误差≤1.77%；利用数值模拟回采矿床矿柱的变形特征与相似模拟试验基本相似，应变变化幅度≤8.76%，试验模型在多层页岩矿床模型试验研究上具有一定的合理性。研究结果为有效的进行多层页岩矿床地下开采研究提供科学依据和试验基础。

Test model research on low strength similar material of Shanghengshan multilayer shale deposit

Different proportions of aggregate and adhesive materials of low strength similar material were developed by similar proportioning test, and the influences of sand-binder ratio and cement content of cemented material on similar material properties were analyzed. Then three feasible and effective proportions of similar materials were determined and a multilayer shale deposits model was established based on condition of deposit and experimental. The results show that the density, uniaxial compressive strength (UCS), elastic modulus, and Poisson's ratio increase with the cement content of cemented material increasing. And the density, porosity, elastic modulus, and Poisson's ratio are less volatility in low sand-binder ratio. Further studies prove that the error between actual similar constant and design similar constant of low strength similar material is less than 1.77%. Meanwhile, combining with the results of numerical simulation, the pillar strain variation between numerical simulation and similar simulation test is less than 8.76%, and the deformation characteristics agree well with each other. It indicats that test model is reasonable and effective in studying multilayer shale deposits model experiment. The study results provide an effective scientific basis and experimental basis of multilayer shale deposit underground mining research.