不同含水率和压实度铅锌尾砂抗剪强度试验研究  

Experimental investigation on Shear Strength of Lead-Zinc Tailings with Different Compaction Degrees and Moisture Contents

作　　者：梁冰[1] 董擎[1] 姜利国[1] 胡学涛[1] 贾立锋[2] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《实验力学》2016年第3期417-424,共8页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目(51574145);国家自然科学基金资助项目(51304113)

摘　　要：尾砂的抗剪强度是分析尾矿坝失稳问题的重要参数。为了探究含水率和压实度对铅锌尾砂抗剪强度的影响,开展三种压实度(80%、90%、100%)情况下五组不同含水率(3%、6%、9%、12%、15%)铅锌尾砂试样的抗剪强度试验。结果表明:铅锌尾砂的剪应力随压实度的增大而增大,随含水率的增大先增大后减小;随着含水率的增大,铅锌尾砂的内摩擦角先减小后增大,粘聚力先增大后减小;在含水率为6%时,粘聚力最大;随着压实度的增大,铅锌尾砂内摩擦角和粘聚力均呈线性增长,含水率为6%时压实度对粘聚力的影响最大,含水率超过12%,压实度对粘聚力的影响逐渐减小;保持尾砂含水率在6%左右和提高尾矿坝的压实度,能够有效提高尾砂抗剪强度,降低尾矿坝溃坝危险性。研究结果对尾矿坝的安全管理和稳定性评价具有一定意义。Shear strength of tailings is an important parameter for analysis of tailings dam instability problem.In order to explore the influence of moisture content and compaction degree on lead-zinc tailings shear strength,shear strength experiment was carried out for lead-zinc tailings samples with 3different compaction degrees（80%,90%and 100%）and 5different moisture contents（3%、6%、9%、12% and 15%）,respectively.Experimental results show that along the increase of compaction degree,the shear force of lead-zinc tailings increases;while along the increase of moisture content,the shear force increases first then decreases;along with the increase of moisture content,the internal friction angle of lead-zinc tailings decreases first then increases,its cohesive forces increases first then decreases rapidly;the maximum cohesive force is reached when moisture content is 6%;along with the increase of compaction degree,both internal friction angle and cohesive force linearly increase;the maximum influence of compaction degree on cohesive force appears when moisture content is 6%;The influence of compaction degree on cohesive force decreases gradually when moisture content is higher than 12%;keeping moisture content about 6% and enhancing the compaction degree of tailings dam can effectively improve its shear strength and reduce the risk of tailings dam break.Above results may provide important evidences for lead-zinc tailings dam management and stability estimation.

关 键 词：铅锌尾砂 含水率 压实度 抗剪强度 

分 类 号：TU411.7[建筑科学—岩土工程] TD982[建筑科学—土工工程]