【作者】 刘剑；

【导师】 罗嗣海；

【作者基本信息】 江西理工大学 ， 建筑与土木工程（专业学位）， 2017， 硕士

【摘要】 离子型稀土矿原地浸矿工艺的注液强度无统一规范,开采过程山体滑坡频发。研究矿体的力学参数、分布规律,并且将矿体力学参数和分布类型应用于矿山临界注液强度的计算,对原地浸矿工艺经济性和安全性有重要意义。基于统计规律测试土体力学参数具有测试结果准确和经济快捷等优点。在赣南某稀土矿山非等间距布置6个测点,共计18个测试孔,通过旁压试验和钻孔剪切试验测试了离子型稀土矿体的旁压模量、黏聚力、内摩擦角和极限压力等力学参数,运用经典统计学方法和地质学统计方法分析矿体力学参数的空间变异性。假设由18个测试孔的测试数据计算得到各力学参数为真值,若15%为工程可接受的误差,运用经典统计学方法分析和地质统计学方法分析最优测试尺度和点数。旁压试验记录的压力和位移关系结合有限法反分析得到矿体的邓肯-张模型参数。测试获得的矿体力学参数、地形参数,运用GeoStudio模拟出矿山临界注液强度。研究得到结果:1.试验矿块内矿体的黏聚力和旁压模量属于强变异,黏聚力的变异系数为0.48,旁压模量的变异系数为0.36;极限压力属于中等变异,变异系数0.21;内摩擦角属于弱变异性,其变异系数为0.067。2.对于试验矿块,在45 m范围内均匀布置5个测点,测试结果可有效估计矿体内黏聚力、旁压模量和极限压力的平均值和变异系数。3.矿体的邓肯-张模型参数是k=1331.7,n=2.775,r_f=0.516,k_b=563,m=0.154,c=22.2,φ=31.7。4.该离子型稀土矿山的临界注液强度为单个注液孔0.41m~3/d。更多还原

【Abstract】 There is no uniform standard for the intensity of liquid injection of in-situ leaching of rare earth mine,only operated by the experience that may cause landslides.The study of the mechanical parameters and distribution of the ore body,the parameters of the constitutive model,and the application of the mechanical parameters and the distribution types to the calculation of the intensity of liquid injection of the mine are of great significance to the economic and safety of insitu leaching process.Based on statistical regularity method to test soil mechanic parameters are both accurately and economical quick.In a rare earth mine southern Jiangxi province,6 measuring points were arranged and each measuring point had 3 test holes.Through pressuremeter test and borehole shear test,pressuremeter modulus,deformation modulus,compression modulus,cohesion and internal friction angle of ion-absorbed rare earth ore body were obtained.And the spatial variability of the mechanic parameters in ore body was analyzed by classical statistics method and geology statistics method.With assuming that the test value of mechanic parameters are truth value and the acceptable error of engineering is 15%.The optimal testing scale and the number of measuring points were analyzed by classical statistics method and geology statistics method.With the relationship between the pressure and displacement in pressuremeter test,the ore body’s Duncan Chang model parameters were figured out by finite element back analysis method.With the mechanical parameters,topographic parameters of the mine,the critical injection intensity simulated by GeoStudio.The results shows that:1.The cohesion and the pressuremeter modulus of ore body in test block are strong variation,variation coefficient of the cohesion is 0.48 and variation coefficient of the pressuremeter modulus is 0.36,the extreme pressure is medium variation,variation coefficient of the extreme pressure is 0.212,the internal friction angle is weak variation,variation coefficient of the internal friction angle is 0.067.2.In this ore block,the test result can efficiently estimate the mean and the variation coefficient of ore body’s cohesion and pressuremeter modulus by arrangement 5 measuring points uniformly in 45 m scope.3.Duncan Chang model parameters of the ore body are k=1331.7,n=2.775,r_f=0.516,k_b=563,m=0.154,c=22.2,φ=31.7.4.The critical injection intensity of this ion-absorbed rare earth mine is 0.41m~3/d each injection well.更多还原