（昆明理工大学建筑工程学院， 昆明 650500）

［摘要］在基坑工程中，土层m值的选取直接影响支挡结构的位移和内力，但是目前在基坑设计过程中，m值主要是通过经验公式选取。结合均匀试验和ACE非参数回归构建高效的响应面，利用Monte Carlo模拟技术枚举出大量m值参数。以不同工况下的实测位移数据作为约束条件，设定容差范围，通过逐步增加筛分工况和逐步缩小容差范围来重复筛分，从而进一步逼近真实值。通过对某实际基坑工程进行算例分析及验证，结果表明该方法是有效可行的。

［关键词］基坑； 均匀试验； ACE法； m值； Monte Carlo模拟技术； 反演

中图分类号：TU753-1文献标识码：A文章编号：1002-848X(2016)24-0084-06

Back analysis of m value for foundation pit soil based on the ACE method

Cao Jing, Hu Rui, Song Zhigang, Sun Changning

（Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China）

Abstract:In foundation pit engineering, the selection of m value for soil directly affects the displacement and internal force of retaining structure. At present, the selection of m value is mainly selected by empirical formula in the foundation pit design process. Based on uniform test and nonparametric regression combination of ACE, efficient response surface was built, and Monte Carlo simulation technique was used to enumerate a lot of parameters for m value. Measured deformation data under different working conditions were taken as constraint conditions, and the tolerance range was set to repeat screening by gradually increasing the screening working condition and gradually narrowing the tolerance range, thus further getting closer to the real value. The analysis and verification of a practical foundation pit engineering shows that this method is effective and feasible.

Keywords:foundation pit; uniform test; ACE method; m value; Monte Carlo simulation technique; back analysis

*  国家自然科学基金青年基金项(No.51108217)。

作者简介：曹净，博士，教授，Email：cjlb117@sina.com。