Effect of cement content on the static and dynamic liquefaction resistance of fine tailing
Effect of cement content on the static and dynamic liquefaction resistance of fine tailing
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DOI：
10.1016/j.cscm.2023.e02825
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发表时间：
2024
影响因子：
6.2
通讯作者：
Longjian Bai;Hongjiang Wang;Xi Zhang;Hao Li;Shixing Yang;Zhigang Tian
中科院分区：
文献类型：
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作者：
Longjian Bai;Hongjiang Wang;Xi Zhang;Hao Li;Shixing Yang;Zhigang Tian
采空区水泥尾矿库可能会受到岩石应力、矿震和爆破应力等静、动载的作用。在动载作用下，CTS的液化风险可能会导致采空区路障失稳。为了更好地了解水泥掺量对CTS抗液化性能的影响。通过静力三轴试验和循环三轴试验确定了CTS储罐动力响应分析所需的参数。利用LS-DYNA有限元分析软件对CTS储罐的爆破响应进行了研究。结果表明，随着水泥掺量的增加，CTS的抗液化能力明显提高。当水泥含量低于2.42%时，CTS表现为近静态液化。当CTS水泥掺量大于2.93%时，表现为应变硬化或弱应变软化，液化指数较低。水泥掺量为0~2.93%的CTS初始液化小于38次循环荷载。动力响应分析表明，随着爆破距离和水泥用量的增加，液化风险减小。对于大于30米的爆破距离，3%的CTS水泥含量足以抵抗爆破时的液化。研究结果为合理设计CTS地下储存参数提供了依据。
Cement tailings storage (CTS) in goaf may experience static and dynamic loading, such as rock stress, mine earthquake and blasting stress. When subject to dynamic loading, the risk for liquefaction of CTS may cause goaf barricade instability. To better understand the effect of cement content on CTS liquefaction resistance. Static and cyclic triaxial tests were conducted to determine the parameters required for the dynamic response analysis of CTS storage. A finite element analysis using LS-DYNA carried out to study the blasting response of CTS storage. The results indicated that the liquefaction resistance of CTS significantly improved with the cement content increased. The CTS exhibited near-static liquefaction when cement content was less than 2.42%. However, CTS cement content greater than 2.93% exhibited strain hardening or weak strain softening with low liquefaction index. The CTS with cement content 0–2.93% initial liquefaction less than 38 cyclic loading. Dynamic response analyzed showed liquefaction risk decreases as blasting distance and cement content increased. For blasting distances greater than 30 m, the CTS cement content of 3% is sufficient to resist liquefaction under blasting. The findings are conducive to the design of appropriate CTS underground storage parameters.