Research and application of a new excavation method in centrifuge model tests on foundation pit engineering
LI Lianxiang1,2,FU Qinghong1,2,ZHANG Yonglei1,2,LU Fenting1,2
(1. Foundation Pit and Deep Foundation Engineering Research Center,Shandong University,Jinan,Shandong 250061,China;
2. School of Civil Engineering,Shandong University,Jinan,Shandong 250061,China)
Abstract:Three common excavation methods in centrifuge model tests were reviewed,including the excavation at 1 g,the drainage of appropriate liquid to simulate excavation and the excavation in-flight using a micro robot. A new excavation device was designed and developed on the basis of the understanding of the excavation processes. It was confirmed to be feasible in a centrifuge model test on foundation pit engineering in sand ground. Compared with the traditional methods,this method can be used to realize the excavation in-flight,to simulate more correctly the lateral earth pressure,and to simplify the excavation process. In the test,the multiple types of sensors were arranged to form a three-dimensional measurement. The test results were compared with the numerical simulations. It was found that the test results were always smaller than those from simulations. The surface settlement profile caused by excavations was a spandrel type. The position of the maximum induced bending moment of the retaining wall moved down along with excavations,but the moving rate decreased gradually. The upper excavation had little impact on the deep earth pressure. Similarly,the changes of the shallow earth pressure were not obvious when the lower soil was excavated.
李连祥1,2,符庆宏1,2,张永磊1,2,鲁芬婷1,2. 基坑离心模型试验开挖方法研究与应用[J]. 岩石力学与工程学报, 2016, 35(04): 856-864.
LI Lianxiang1,2,FU Qinghong1,2,ZHANG Yonglei1,2,LU Fenting1,2. Research and application of a new excavation method in centrifuge model tests on foundation pit engineering. , 2016, 35(04): 856-864.
中华人民共和国行业标准编写组. JGJ 120—2012建筑基坑支护技术规程[S]. 北京:中国建筑工业出版社,2012.(The Professional Standards Compilation Group of People?s Republic of China. JGJ 120—2012 Technical specification for retaining and protection of building foundation excavations[S]. Beijing:China Architecture and Building Press,2012.(in Chinese))
Your browse does not support frame!