中文摘要：

江西寻乌的离子型稀土矿体为属于粉土,是介于砂性土和黏性土之间的一种过渡性土。研究该类矿体的抗剪强度计算方法,对于分析原地浸矿过程的边坡稳定具有重要意义。应用水土分合算理论,引入水压率的概念,从土的微观层面上分析水对矿体强度的影响,设计出一种室内测定水压率的试验装置。测定不同孔隙比下的水压率,采用GDS三轴仪测试总应力指标和有效指标,分别计算水土合算、水土分算和水土统一算法下稀土矿体的抗剪强度。试验研究结果表明：矿体孔隙比越大,水压率越大,饱和矿体的抗剪强度随着水压率的增大而减小;寻乌稀土矿体的水压率值为0.90~0.92;因而,采用水土统一算法计算得到的抗剪强度值与水土分算法的抗剪强度值更接近,与水土合算下的抗剪强度值相差较大。

英文摘要：

The rare earth ore bodies of Xunwu,Jiangxi belong to the silt. Silt is a kind of transitional soil between sandy soil and clays. The calculation method of shear strength of these kind of ore bodies are of great significance to the analysis of the stability of the slope in the in-situ leaching process. The theory of soil-water pressure calculated jointly or separately were used. The concept of the rate of water pressure was introduced. Analyzing the effect of water on the strength of ore bodies from the micro level of soil,an experimental device for measuring the rate of water pressure is designed. The rate of water pressure in the same kind of ore bodies with different pore ratio was determined. The total stress and effective stress index are measured in the different conditions by using the GDS triaxial apparatus. The sheer strength of ore bodies in the condition of soilwater calculated jointly,soil-water calculated separately and soil-water calculation uniformly was calculated. The results of the experimental show that the greater the void ratio is,the greater the rate of water pressure is. The shear strength of saturated ore bodies decreases with the increase of the rate of water pressure. The rate of water pressure of the rare earth ore bodies in Xunwu is 0. 90 ~ 0. 92. Therefore,the result in soil-water calculation uniformly is closer to the result in soil-water calculation separately is a great difference of soil-water calculation jointly.