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Remediation against floatation of underground structures

机译：防止地下结构漂浮的补救措施

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摘要

Underground structures located in liquefiable soil deposits are susceptible to floatation following an earthquake event due to their lower unit weight relative to the surrounding saturated soil. Centrifuge tests have been carried out to assess the effectiveness of existing remediation techniques in reducing the uplift of underground structures, namely in situ densification and the use of coarse sand backfill. The centrifuge test results showed that these methods do reduce the uplift displacement of buoyant structures. Their performance was thereafter linked to the theoretical mechanism of floatation of underground structures. Based on the understanding from preceding tests, a further improvement on the use of the coarse sand backfill was carried out, which produced a greater reduction in the uplift displacement of the structure. Each of these techniques, however, does pose issues when applied in the field, such as possible damage to surrounding structures, construction issues and maintenance problems.
机译：地震事件发生后，位于可液化土壤沉积物中的地下结构由于相对于周围饱和土壤的单位重量较低而易于漂浮。已经进行了离心测试，以评估现有修复技术在减少地下结构隆起方面的有效性，即现场致密化和使用粗砂回填。离心测试结果表明，这些方法确实减少了浮力结构的上浮位移。此后，它们的性能与地下结构漂浮的理论机理有关。根据先前测试的理解，对粗砂回填料的使用进行了进一步的改进，从而大大降低了结构的抬升位移。但是，这些技术中的每一种在现场应用时都会带来问题，例如可能损坏周围的结构，施工问题和维护问题。

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