Research Article Comparison on the Horizontal Behaviors of Lattice-Shaped Diaphragm Wall and Pile Group under Static and Seismic Loads Jiu-jiang Wu, 1,2 Qian-gong Cheng, 2,3 Hua Wen, 1 Yan Li, 3 Jian-lei Zhang, 3 and Ling-juan Wang 1 1 School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China 2 MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 611756, China 3 Department of Geological Engineering, Southwest Jiaotong University, Chengdu 611756, China Correspondence should be addressed to Qian-gong Cheng; chengqiangong@home.swjtu.edu.cn Received 19 November 2015; Revised 28 April 2016; Accepted 3 May 2016 Academic Editor: Salvatore Russo Copyright © 2016 Jiu-jiang Wu et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Lattice-shaped diaphragm wall (hereafer referring to LSDW) is a new type of bridge foundation, and the relevant investigation on its horizontal behaviors is scant. Tis paper is devoted to the numerical study of the comparison on the static and seismic responses of LSDW and pile group under similar material quantity in sof soil. It can be found that the horizontal bearing capacity of LSDW is considerably larger than that of pile group, and the deformation pattern of LSDW basically appears to be an overall toppling while pile group clearly shows a local bending deformation pattern during the static loading process. Te acceleration response and the acceleration amplifcation efects of LSDW are slightly greater than that of pile group due to the existing of soil core and the diference on the ability of energy dissipation. Te horizontal displacement response of pile group is close to that of LSDW at frst and becomes stronger than that of LSDW due to the generation of plastic soil deformation near the pile-soil interface at last. Te pile body may be broken in larger potential than LSDW especially when its horizontal displacement is notable. Compared with pile group, LSDW can be a good option for being served as a lateral bearing or an earthquake-proof foundation in sof soil. 1. Introduction Te diaphragm wall industry started in Italy in the 1940s and spread throughout the world in many decades [1]. Progress has been made in design, equipment, and technology to fulfll the needs of varied underground constructions, and its application has been broadened into many engineering areas. In recent years, diaphragm wall is gradually applied to bridge engineering being served as the foundation directly [2]. Lattice-shaped diaphragm wall (hereafer referring to LSDW), shown in Figure 1, is a new type of bridge foundation composed of a cap and diaphragm walls [3]. Te diaphragm walls under the cap are connected with rigid joints that form a rectangular frame or a frame with multichambers in hori- zontal section [4]. With the properties of high construction efciency, low cost, small noise, and great rigidity, LSDW is especially suitable for being used as the large-span bridge foundations. Te construction detail of wall elements installation of an LSDW is illustrated in Figure 2. Te wall elements of an LSDW are constructed in turn and can be divided into many segments, and the wall element constructed at the beginning can be termed as the preceding wall element while the subse- quently constructed wall element is termed as the following wall element as shown in Figure 2. It is worthwhile to note that both of the construction processes of the preceding wall element and the following wall element consist of four steps. Among these steps, Steps 1 and 2 are mainly completed by an excavator. Te excavator used in the construction system of LSDW has the advantages of high efciency, low noise, and small occupation of the construction area. Te preceding and the following wall elements are connected by preset joints to form an integrated wall segment, and then an LSDW can be constructed by combining multiwall segments arranged in diferent directions. More details about the construction procedures and joints arrangement of LSDWs with diferent Hindawi Publishing Corporation Shock and Vibration Volume 2016, Article ID 1289375, 17 pages http://dx.doi.org/10.1155/2016/1289375