Earth Pressure of the Trapdoor Problem Using Three-Dimensional Discrete Element Method  

作　　者：Qizhi Chen ChuliXu Baoping Zou Zhanyou Luo Changjie Xu Xu Long 

机构地区：[1]School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou,310023,China [2]School of Civil and Environmental Engineering,Ningbo University,Ningbo,315211,China [3]School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang,330013,China [4]School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi’an,710072,China

出　　处：《Computer Modeling in Engineering & Sciences》2023年第5期1503-1520,共18页工程与科学中的计算机建模（英文）

基　　金：supports from National Natural Science Foundation of China (NSFC Grant No.52008373);Natural Science Foundation of Zhejiang Province of China (No.Q22E080445)are greatly acknowledged.

摘　　要：Load transformation from the yielding part of the soil to the adjacent part is known as the soil arching effect,which plays an important role in the design of various geotechnical infrastructures.Terzaghi’s trapdoor test was an importantmilestone in the development of theories on soil arching.The research on earth pressure of the trapdoor problem is presented in this paper using the three-dimensional(3D)discrete element method(DEM).Five 3D trapdoor models with different heights are established by 3DDEMsoftware PFC 3D.The variation of earth pressure on the trapdoor with the downward movement of the trapdoor,the distribution of vertical earth pressure along the horizontal direction,the distribution of vertical earth pressure along the vertical direction,the distribution of lateral earth pressure coefficient along the depth direction,the magnitude and direction of contact force chain are studied,respectively.Related research results show that the earth pressure on the trapdoor decreases rapidly after the downward movement of the trapdoor,and then reaches the minimum earth pressure.After that,the earth’s pressure will rise slightly,and whether this phenomenon occurs depends on the depth ratio.For the bottom soil,due to the stress transfer caused by the soil arching effect,the ratio of earth pressure in the loose area decreases,while the ratio of earth pressure in the stable area increases.With the trapdoor moving down,the vertical earth pressure along the depth in the stable zone is basically consistent with the initial state,which shows an approximate linear distribution.After the trapdoor moves down,the distribution of earth pressure along with the depth in the loose area changes,which is far less than the theoretical value of vertical earth pressure of its self-weight.Because of the compression of the soil on both sides,the lateral earth pressure coefficient of most areas on the central axis of the loose zone is close to the passive earth pressure coefficient Kp.The existence of a‘soil arch’can be observed

关 键 词：Soil arching effect three dimensional discrete element earth pressure contact force chain 

分 类 号：O17[理学—数学]