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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。
The shear strength of tailing sand is an important parameter for analyzing the instability of tailings dam. In order to investigate the influence of moisture content and compaction degree on the shear strength of lead-zinc tailings, five different moisture contents (3%, 6%, 9%) under three kinds of compaction degree (80%, 90%, 100% %, 12%, 15%) Shear strength test of lead-zinc tailings samples. The results show that the shear stress of lead-zinc tailings sand increases with the increase of compaction degree, then increases with the increase of water content and then decreases. With the increase of water content, the internal friction angle of lead-zinc tailings The cohesive force first increases and then decreases; the cohesive force is the largest when the moisture content is 6%; with the compaction degree increasing, the internal friction angle and cohesion All showed a linear increase. When the moisture content was 6%, the degree of compaction had the greatest influence on the cohesion, the moisture content was over 12%, and the influence of compaction on the cohesion decreased gradually. The moisture content of the tailings was about 6% And improve the compaction degree of tailings dam, which can effectively improve the shear strength of tailings and reduce the risk of tailings dam break. The research results have certain significance for the safety management and stability evaluation of tailings dam.