| 梁冰,董擎*,姜利国,胡学涛,贾立锋.不同含水率和压实度铅锌尾砂抗剪强度试验研究[J].实验力学,2016,31(3):417~424 |
| 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 |
| 投稿时间：2015-09-10 修订日期：2016-01-31 |
| DOI：10.7520/1001-4888-15-160 |
| 中文关键词: 铅锌尾砂 含水率 压实度 抗剪强度 |
| 英文关键词:lead-zinc tailings moisture content compaction degree shear strength |
| 基金项目: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) |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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 3 different compaction degrees (80%, 90% and 100%) and 5 different 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. |
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