During the 2008 Wenchuan earthquake, extensive liquefaction of sand-like gravelly soil deposits was observed over an area of about 500 × 200 km2. Since gravel content significantly affects the stiffness and liquefaction resistance of gravelly soils, it has become an ongoing challenge for engineers to reliably and cost-effectively assess the liquefaction resistance of such soil deposits with different gravel contents. To this end, the procedures for consistently assessing the liquefaction resistance of sand-like gravelly soils were first put forward based on the previously proposed improved CRR-Vs1 characterization model for binary mixtures, which converts the liquefaction evaluation of sand-like gravelly soils into the assessment of liquefaction resistance of the base sand matrix with an equivalent stiffness. Then, in-situ gravelly soils sampled from the earthquake-impacted area were tested to parameterize the proposed characterization model. Lastly, liquefaction case histories of gravelly soils compiled during the 2008 Wenchuan earthquake were recompiled and restudied to validate the performance of the proposed characterization model. Typical liquefaction case history studies show that the proposed characterization model successfully predicts the severe liquefaction hazard at the Banqiao school site and the marginal liquefaction phenomenon at the Jiangyou thermal power plant site. Comparisons between the proposed characterization model and the 54 recompiled liquefaction case history datasets demonstrate that the proposed characterization model can accurately discriminate both the liquefied and non-liquefied case histories. These validation results in turn suggest that the proposed characterization model is highly feasible for engineering applications on a regional scale covering various gravel contents.

中文翻译：

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2008 年汶川地震期间基于现场 Vs 测量的沙状砾石土沉积物液化评价


在 2008 年汶川地震期间，在约 500 × 200 km2 的区域内观察到沙状砾石土壤沉积物的广泛液化。由于砾石含量会显著影响砾石土壤的刚度和抗液化性，因此工程师们要可靠且经济高效地评估不同砾石含量的土壤沉积物的抗液化性已成为一个持续的挑战。为此，首先在先前提出的改进的二元混合物 CRR-Vs1 表征模型的基础上，提出了一致评价砂状砾石土抗液化性的程序，该模型将砂状砾石土的液化评价转化为具有同等刚度的基砂基质的抗液化性评价。然后，对从地震影响区取样的原位砾石土进行测试，以参数化所提出的表征模型。最后，重新编译和重新研究了 2008 年汶川地震期间汇编的砾石土液化案例历史，以验证所提出的表征模型的性能。典型液化实例历史研究表明，所提出的表征模型成功预测了板桥校址的严重液化危害和江油火电厂厂址的边缘液化现象。所提出的表征模型与 54 个重新编译的液化案例历史数据集之间的比较表明，所提出的表征模型可以准确区分液化和非液化案例历史。 这些验证结果反过来表明，所提出的表征模型对于涵盖各种砾石含量的区域尺度的工程应用具有高度可行性。