Numerical investigation on arching effect surrounding deep cylindrical shaft during excavation process

作     者：Tanawat Tangjarusritaratorn Yuusuke Miyazaki Yasuo Sawamura Kiyoshi Kishida Makoto Kimura 

作者机构：Dept.of Urban ManagementKyoto Univ.Katsura CampusKyoto 615-8540Japan Dept.of Civil and Earth Resources EngineeringKyoto Univ.Katsura CampusKyoto 615-8540Japan 

出 版 物：《Underground Space》 (地下空间（英文）)

年 卷 期：2022年第7卷第5期

页      面：944-965页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：partly supported by Association for Disaster Prevention Research 

主　　题：Deep cylindrical shaft Excavation analysis Soil mixing wall method Arching effect Finite different method Three-dimensional analysis 

摘      要：Predicting the inner displacements of deep vertical shafts during the excavation process has been a difficult task considering the geological,structural,and constructional *** fact,the two-dimensional(2D)analytical solution based on the retaining wall model remains insufficient for understanding the actual behavior during an *** is because the deformation of vertical shafts becomes complicated due to the unexpected arching effect brought about by the three-dimensional(3D)flexible displacements occurring in the excavation *** analytical solutions only considered the limit ***,the present study deals with a 3D soil-structure simulation by considering the displacements of a cylindrical shaft and the mechanical behavior of the surrounding soil as well as the geometry of the cylindrical ***,this mechanical behaviors of the surrounding soil and shaft are controlled by the shaft stiffness;hence,the relationships among the shaft stiffness,mechanical behavior of the surrounding soil(in terms of earth pressure coefficient),and shaft displacement were investigated.A cylindrical model,120 m in depth and 20 m in diameter,was positioned at the center of a sand domain,and each excavation step was performed at an interval depth of 20 m.A 3D finite difference method analysis was applied using the modified Cam-Clay(MCC)model to represent the soil *** a result,the present study provides a new normalized lateral earth pressure theory for excavated shafts by considering the 3D arching effect obtained from parametric studies using various levels of shaft *** a comparison with the analytical solutions of previous studies(Terzaghi,1943a;Prater,1977;Cheng&Hu,2005),it is found that the previous studies underestimated the earth pressure acting on the cylindrical shaft because they did not consider the accurate arching effect.