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（昆明理工大學(xué)建筑工程學(xué)院， 昆明 650500）

［摘要］在基坑工程中，土層m值的選取直接影響支擋結(jié)構(gòu)的位移和內(nèi)力，但是目前在基坑設(shè)計(jì)過(guò)程中，m值主要是通過(guò)經(jīng)驗(yàn)公式選取。結(jié)合均勻試驗(yàn)和ACE非參數(shù)回歸構(gòu)建高效的響應(yīng)面，利用Monte Carlo模擬技術(shù)枚舉出大量m值參數(shù)。以不同工況下的實(shí)測(cè)位移數(shù)據(jù)作為約束條件，設(shè)定容差范圍，通過(guò)逐步增加篩分工況和逐步縮小容差范圍來(lái)重復(fù)篩分，從而進(jìn)一步逼近真實(shí)值。通過(guò)對(duì)某實(shí)際基坑工程進(jìn)行算例分析及驗(yàn)證，結(jié)果表明該方法是有效可行的。

［關(guān)鍵詞］基坑； 均勻試驗(yàn)； ACE法； m值； Monte Carlo模擬技術(shù)； 反演

中圖分類號(hào)：TU753-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*  國(guó)家自然科學(xué)基金青年基金項(xiàng)(No.51108217)。

作者簡(jiǎn)介：曹凈，博士，教授，Email：cjlb117@sina.com。