地震引起的土壤液化是一种常见的地质灾害，研究场地液化势的评估方法和抗液化工程措施的成效评估是地质工程领域的重要课题。受复杂地质作用的影响，地层结构及其土体参数广泛存在空间变异性。本项目以可液化土体参数空间变异性为研究对象，通过收集国内外可液化场地的原位测试数据，建立可液化土体参数空间变异性数据库和抗液化工程案例库；分别采用马尔科夫链随机场和条件随机场方法表征地层结构及其土体参数的空间变异性，构建考虑地层结构及其土体参数变异性的地质模型以预测场地液化势；通过室内模型试验和数值模拟分别验证地质模型及其预测液化势的可靠性，并从空间变异性角度揭示抗液化工程措施的综合成效。通过上述研究拟建立一套考虑地层空间变异性的、定量且有效的场地液化势评估方法和抗液化工程措施成效评估的理论体系。本项目的研究成果可为城市防震减灾提供新的思路和技术手段，对抗液化工程措施的方案选择和设计补强等具有重要参考价值。

Liquefaction is one of the most common geological hazards triggered by earthquakes. Thus, it is essential to evaluate liquefaction potential accurately at a planned project site and assess the efficacy of a mitigation strategy, such as ground improvement, at the project site if it is deemed necessary. Owing to the complexity of geological processes, both the stratum and the geotechnical parameters in each layer may be spatially varied. This project focuses on the spatial variability of liquefiable soils. Databases consisting of the soil spatial variability data and the ground improvement cases will be first developed. To characterize the liquefaction potential of a project site, a geologic model that simultaneously considers the spatial variability in each stratum and its geotechnical parameters will be established. The Markov chain Monte Carlo model and the conditional random field model will be used to characterize the spatial variability in the stratum and the geotechnical parameters, respectively. Then, both the laboratory model tests and the numerical simulations will be conducted to verify the reliability of the proposed methodology and the accuracy of the resulting liquefaction potential evaluation. The effect of ground improvement will be evaluated from the perspective of the liquefaction performance of the entire site, considering the spatial variability. Through this project, a quantitative, practical, and efficient evaluation framework for the liquefaction potential of soils and the effect of ground improvement that considers the spatial variability in stratigraphy will be developed. This project is expected to provide new insights for seismic damage prevention and mitigation, especially for the liquefaction hazard mitigation that focuses on ground improvement.