A Framework for Assessing Liquefaction Hazard for Urban Areas Based on Soil Dynamics
A Framework for Assessing Liquefaction Hazard for Urban Areas Based on Soil Dynamics
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DOI：
10.1142/s0219876216410115
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发表时间：
2016-07
影响因子：
1.7
通讯作者：
Jian Chen-;T. Takeyama;H. O.-tani;K. Fujita;M. Hori
中科院分区：
文献类型：
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作者：
Jian Chen-;T. Takeyama;H. O.-tani;K. Fujita;M. Hori
地震引起的土壤液化对城市地区构成巨大威胁，不仅对基础设施造成直接损害，而且延误救援行动。现有的使用液化安全系数（FL）等指标的工程评估方法往往会高估液化危险。而用于液化评估的土壤动力分析的标准用法仅限于具有详细场地信息的单个场地。在本文中，我们提出了一个基于土壤动力学的框架，用于评估城市地区的液化危险，这些地区包含许多仅具有钻孔记录的地点。该框架的特点是生成分析模型并根据可用的钻孔信息自动估计材料参数。土壤动力学控制方程由有限元代码求解。根据给定地震波的超孔隙水压力解来评估液化危险。作为演示，我们展示了简单剪切试验的模拟结果以及目标场地在人工和实际地震波载荷下的地震响应的模拟结果。自动模型构建和参数估计使该框架能够有效地应用于城市范围的液化评估，作为当前基于工程指标的实践的替代方案。
Soil liquefaction induced by earthquakes poses a great threat to urban areas, not only by causing direct damages to infrastructures but also by delaying rescue and relief actions. Established engineering assessment methods using indices such as factor of safety against liquefaction (FL) tend to overestimate liquefaction hazards. While the standard usage of soil dynamic analysis for liquefaction assessment is limited to a single site with detailed site information. In this paper, we propose a framework based on soil dynamics for assessing liquefaction hazard for urban areas which contain numerous sites with borehole logs only. The framework is featured by generating analysis models and by estimating material parameters automatically from available borehole information. The governing equations for soil dynamics are solved by a finite element code. Liquefaction hazard is assessed according to the solutions of excess pore water pressure for given seismic waves. As demonstrations, we show simulation results of simple shear tests and of seismic response for a target site under loadings of artificial and of actual seismic waves. The automatic model construction and parameter estimation enable this framework being applied effectively for urban-area-wide liquefaction assessment, as an alternative for the current practices based on engineering indices.