摘要
MJS加固技术中各加固参数对工程稳定性的影响及参数间的交互效应、敏感程度及关联机制仍不明确。针对该问题,以南京市建宁西路大直径盾构切削江堤抗滑桩工程为背景,采用PLAXIS软件进行三维有限元数值模拟,基于均匀实验法对江堤最大沉降、安全系数等指标的注浆压力、加固长度、加固宽度以及加固高度等影响江堤加固效果的参数间的关联机制进行定量评价,在敏感性分析结果的基础上对施工参数进行了优化设计。结果表明:MJS加固参数对江堤最大沉降影响较大,而对安全系数影响较小;适当增大MJS加固体长度有利于控制江堤最大沉降量;盾构施工中采用适当的支护压力能够有效控制土体的沉降和变形。
The influence of various reinforcement parameters on engineering stability in MJS reinforcement technology,as well as the interaction effect,sensitivity and correlation mechanism between parameters are still unclear.To resolve the above issues,taking the large-diameter shield cutting anti-sliding pile project of river embankment on Jianning West Road in Nanjing as the background,and the PLAXIS software was used for three-dimensional finite element numerical simulation.Taking the maximum settlement and safety factor of the embankment as the index,focusing on the four influencing factors of grouting pressure,reinforcement length,reinforcement width and reinforcement height,the correlation mechanism between the parameters affecting the reinforcement effect of the river embankment was quantitatively evaluated based on the uniform test method.Then,the construction parameters were optimally designed on the basis of the sensitivity analysis results.The results show that:MJS reinforcement parameters have a greater impact on the maximum settlement of the river embankment and less on the safety factor;Properly increasing the length of MJS reinforcement is beneficial to control the maximum settlement of the river embankment;Appropriate support pressure in shield construction can effectively control the settlement and deformation of soil.
作者
孙阳
蒙邹蕾
王翀霄
姚森
SUN Yang;MENG Zou-lei;WANG Chong-xiao;YAO Sen(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;Nantong Hohai University Institute of Ocean and Offshore Engineering,Nantong 223003,China;China Railway Major Bridge Engineering Group Co.Ltd.,Wuhan 430000,China)
出处
《水道港口》
2023年第3期439-446,共8页
Journal of Waterway and Harbor
基金
国家自然科学基金项目(41672257)
南通市科技计划项目(JC2021009)。
关键词
MJS加固
盾构施工
均匀试验法
敏感性分析
MJS reinforcement
shield construction
uniform test method
sensitivity analysis
