作　　者： ; ;

机构地区： 华南理工大学

出　　处： 《矿业研究与开发》 2006年第6期27-31,共5页

摘　　要： 为研究矿山酸性水（Acid Mine Drainage，AMD）对矿山边坡的破坏作用，在不同时间步长条件下，用pH；1．07，3．26的两种H2O4溶液蚀化砂岩，然后对蚀化的砂岩试样进行抗压试验和细观结构观察。试验结果表明，在AMD作用后，砂岩的单轴抗压强度降低幅值达30％-50％，弹性模量降低25％-45％，粘聚力和内摩擦角降低，泊松比在0．20—0．29范围内波动。节理越发育，试件过峰后的残余应力值越大，破坏时间越长。细观研究表明，AMD作用后，砂岩中的Fe、A1等金属元素被稀释、溶解，质量百分比大幅下降。机理分析表明，AMD作用过程中，砂岩内节理和裂隙间的充填物频繁发生分解和聚合反应，改变岩体内部分子结构和骨架组成，降低岩体层面间的粘聚力和内摩擦角。 In order to study damage effect of AMD （Acid Mine Drainage） on mine slope, two kinds of H2SO4 solutions with pH value of 1.07 or 3.26 were used to corrode the sandstone samples at the condition of different time steps, then the compression strength of the corroded sandstone samples was tested, and their microstructure was obserxed. The results indicated that the uniaxial compression strength of the corroded sandstone decreased by 30% - 50%, its elastic modulus dropped by 25% - 45%, the cohesion and internal friction angle decreased also, its Polsson ratio fluctuated at the range of 0.20 - 0.29; the more the joints develop, the bigger the residual stress after the peak value, the longer the time to damage. The mierostructure research showed that after sandstone was corroded by AMD , the elements contained in sandstone such as Fe, M, etc, had been attenuated and dissolved, the mass percents of above elements had been greatly declined. The reaction mechanism analysis indicated that the joints inside the sandstone and the fillings between fissures frequently take place the decompose and polyreaction during the AMD corroding, it changes the molecular structure inside the rock mass and the composition of its framework, so reduce the cohesion and the internal friction aingle of rock mass.

关 键 词： 砂岩 抗压强度 细观结构

领　　域： [建筑科学] [建筑科学] [矿业工程]