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Interpretation of state parameter in partially drained tailings: a case history examination
Géotechnique Letters ( IF 2.1 ) Pub Date : 2021-10-11 , DOI: 10.1680/jgele.21.00066
D. Reid 1 , K. Smith 2
Affiliation  

Estimating state parameter in tailings storage facilities (TSFs) is a key component to assessing their stability. The cone penetrometer test (CPT) forms the key tool to all current methods to enable rapid assessment of in situ state parameter. Methods to estimate state parameter from the CPT in common use range from screening-level techniques to drained and undrained cavity expansion methods. Importantly, there is no comprehensive method, such as a cavity expansion-based approach, for partially drained CPT soundings. This paper outlines further investigation of a recent study where state parameter had been estimated using screening methods and through direct comparison of in situ void ratio (through water content) to the critical state line measured on reconstituted samples. In the current study, the state parameter was estimated on the basis of both drained and undrained cavity expansion solutions. This was done as although the sounding in question was partially drained, the drained and undrained cavity expansion solutions represent accepted leading practice in TSF investigations. The results of this comparison indicate that the use of drained and undrained cavity expansion tools appears to over- and under-estimate state parameter, respectively. Implications for tailings engineering practice, and ways forward for this issue, are discussed.

中文翻译:

部分排放尾矿状态参数的解释:案例历史检查

估计尾矿储存设施 (TSF) 的状态参数是评估其稳定性的关键组成部分。锥入度计测试 (CPT) 是所有当前方法的关键工具,可快速评估原位状态参数。从常用的 CPT 估计状态参数的方法范围从筛选级技术到排水和不排水空腔扩展方法。重要的是,对于部分排水的 CPT 测深,没有综合的方法,例如基于腔扩展的方法。本文概述了最近一项研究的进一步调查,其中使用筛选方法并通过直接比较原位空隙率(通过含水量)与在重构样品上测量的临界状态线来估计状态参数。在目前的研究中,状态参数是根据排水和不排水的空腔膨胀解决方案估计的。这样做是因为尽管有问题的测深被部分排水,但排水和不排水的空腔膨胀解决方案代表了 TSF 调查中公认的领先实践。该比较的结果表明,使用排水型和不排水型腔扩张工具似乎分别高估和低估了状态参数。讨论了尾矿工程实践的意义,以及解决这个问题的方法。该比较的结果表明,使用排水型和不排水型腔扩张工具似乎分别高估和低估了状态参数。讨论了尾矿工程实践的意义,以及解决这个问题的方法。该比较的结果表明,使用排水型和不排水型腔扩张工具似乎分别高估和低估了状态参数。讨论了尾矿工程实践的意义,以及解决这个问题的方法。
更新日期:2021-10-12
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