摘要
结合某水上基坑围护结构的方案设计,采用二维有限元数值模拟研究了地下连续墙与混凝土填充组合钢板桩两种不同基坑围护方案的变形与受力特性。基于Plaxis 2D分别建立两种方案考虑结构与土体共同作用的整体计算模型,对比并分析不同施工工况下围护墙侧向变形、稳定安全系数及支护结构内力的差异。研究表明,由于钢板桩围护方案克服了常规地下连续墙工法须先筑堤再成槽的陆上施工方法的不足,能够与前方码头结构同步进行水上施工,同时组合钢板桩更能有效地结合两排钢板桩与混凝土芯墙的整体刚度,减小作用于围护墙的土压力。施工工艺、施工工序及围护墙整体刚度的差异,使得组合钢板桩方案在基坑变形与稳定控制等方面均明显优于地下连续墙方案。
A two-dimensional finite element method(FEM) simulation is carried out to investigate the performance of the retaining structure scheme, including the conventional diaphragm wall and the recommended concrete-filled double-row composite steel sheet piles, for a waterfront braced excavation project. Representative numerical models based on Plaxis 2D are established to compare the differences of lateral displacement, safety factor of stability, and internal force of retaining structures under complicated construction and loading conditions. The numerical results reveal that the composite steel sheet piles can be constructed simultaneously with the front pile-supported wharves in water to exhibit the greater global bending stiffness of concrete combined with the steel sheet piles more effectively, reducing the lateral soil pressure acting on the retaining wall correspondingly during inside excavation and dewatering. Therefore, the maximum lateral displacement of the composite steel sheet piles is only around one third that of the diaphragm wall at the most disadvantageous construction stage, and the overall deformation as well as the stability characteristics are better than those of the diaphragm wall, demonstrating a favorable load-carrying performance and a vigorous deformation control capability.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期515-521,共7页
Chinese Journal of Geotechnical Engineering
关键词
水上基坑
围护结构
数值模拟
地下连续墙
组合钢板桩
waterfront excavation
retaining structure
numerical simulation
diaphragm wall
composite steel sheet pile
