Mechanistic Development of CPT-Based Cyclic Strength Correlations for Clean Sand
Mechanistic Development of CPT-Based Cyclic Strength Correlations for Clean Sand
复制标题
DOI：
10.1061/(asce)gt.1943-5606.0002101
复制
发表时间：
2019-10-01
影响因子：
3.9
通讯作者：
DeJong, Jason T.
中科院分区：
文献类型：
--
作者：
Moug, Diane M.;Price, Adam B.;DeJong, Jason T.
提出了开发基于锥入试验的液化触发相关性的机械方法，并通过在渥太华砂中的应用进行了评估。机械方法利用了来自不排水循环直接简单剪切试验、动态岩土离心机试验与飞行锥体贯入剖面和锥体贯入模拟的数据组合。对渥太华砂进行循环直接简单剪切试验表征了循环阻力比 (CRR) 和相对密度 (DR) 之间的关系。锥尖阻力 (qc) 和 DR 之间的关系是根据岩土离心机测试和锥入度模拟得出的。使用 MIT-S1 本构模型和渥太华砂的三种不同校准进行渗透模拟，检查临界状态线形状和位置对模拟质量控制值的作用。实验室测试的 CRR-DR 关系由通过通用 DR 值测量和模拟的 qC-DR 关系组成，以开发 CRR-qc 关系。另一种 CRR-qc 关系是根据离心机测试传感器阵列数据（即加速度计和孔隙压力传感器阵列）的逆分析得出的。将这些不同方法的结果与基于案例历史的干净沙子相关性进行比较，并讨论它们的相对优点。为未来应用这些机械方法来开发特征不良或独特土壤的液化触发相关性提供了建议。
Mechanistic approaches to developing cone penetration test-based liquefaction triggering correlations are presented and evaluated with an application to Ottawa sand. The mechanistic approaches utilize combinations of data from undrained cyclic direct simple shear tests, dynamic geotechnical centrifuge tests with in-flight cone penetration profiles, and cone penetration simulations. Cyclic direct simple shear tests on Ottawa sand characterize the relationship between cyclic resistance ratio (CRR) and relative density (DR). Relationships between cone tip resistance (qc) and DR are developed from geotechnical centrifuge tests and cone penetration simulations. Penetration simulations using the MIT-S1 constitutive model with three different calibrations for Ottawa sand examine the role of critical state line shape and position on simulated qc values. The CRR-DR relationship from laboratory tests is composed with measured and simulated qC-DR relationships via common DR values to develop CRR-qc relationships. An alternative CRR-qc relationship is developed from inverse analyses of centrifuge test sensor array data (i.e., arrays of accelerometers and pore pressure sensors). The results of these different approaches are compared to case history-based correlations for clean sand and their relative merits discussed. Recommendations are provided for future application of these mechanistic approaches to developing liquefaction-triggering correlations of poorly characterized or unique soils.