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（廣州市建筑科學研究院有限公司， 廣州 510440）
［摘要］對于現(xiàn)場自平衡試驗無法測得極限承載力的試樁，基于自平衡試驗的基樁實測位移數(shù)據(jù)，采用三維有限元-無限元組合方法來模擬自平衡加載過程，結合位移反分析理論對樁土之間的界面力學參數(shù)進行反演計算，再利用反演得到的參數(shù)優(yōu)化值進行正演計算分析，從而得到試樁極限承載力和豎向上拔最大位移值。實踐證明，這種計算分析方法是合理可靠的，它是樁基極限承載力的理論預測分析與工程實際相聯(lián)系的有效平臺，為類似樁基工程的設計施工技術決策提供了切實可行的理論分析方法。
［關鍵詞］自平衡試驗； 大直徑人工挖孔樁； 樁-土界面； 力學參數(shù)； 反演分析；無限元； 接觸面單元
中圖分類號：TU473-1文獻標識碼：A文章編號：1002-848X(2016)16-0093-04
Study on experiment and numerical simulation inversion analysis of large diameter manual hole digging pile-soil interface mechanical parameters
Tang Mengxiong, Qi Yuliang, Liu Bingkai, Hu Hesong
(Guangzhou Institute of Building Science Co., Ltd., Guangzhou 510440, China)
Abstract:The ultimate bearing capacity of test piles cannot be measured by field self-balanced test. Based on the measured displacement data of self-balanced test piles, 3D finite element-infinite element coupling method was used to simulate the process of self-balanced load. Combined with the theory of displacement inversion analysis, inversion calculation was conducted on pile-soil interface mechanical parameters. The parameter optimization values obtained by inversion were used for forward calculation analysis to obtain the ultimate bearing capacity of the test piles and the maximum displacement value of the vertical uplift. Practice has proved that the calculation method is reasonable and reliable and it is an effective platform relating theoretical prediction analysis with engineering practice of pile ultimate bearing capacity. It provides a feasible theoretical analysis method for construction technology decision-making in similar pile foundation engineering designs.
Keywords:self-balanced test; large diameter manual hole digging pile; pile-soil interface; mechanical parameter; inversion analysis; infinite element; contact surface element
*廣東省應用型科技研發(fā)重大專項資金項目(2015B020238014),2016年廣州市珠江科技新星項目（201610010099）。
作者簡介：唐孟雄，博士，教授級高級工程師，一級注冊土木工程師（巖土），一級建造師，Email:tmx@gibs.com.cn。
