摘要
合理的群管顶进顺序是管幕时空维度上控制地层变形的关键措施之一,基于国内外单双隧道开挖地层损失的修正Peck公式,提出考虑管幕特点的管幕群管施工地层损失计算方法,同时依托某工程案例采用ABAQUS有限元分析软件对复合地层下的群管顶进顺序及地层沉降展开研究。研究发现:各顶进方案地表沉降曲线与经验Peck公式曲线相似,地层埋深、顶进顺序、岩土层性质、管间微土拱效应对地层沉降都有影响;自下而上顶进的C1方案在控制地层沉降方面较有优势,最大沉降量相比C3方案减小约35.6%。最后,以优选后的C1方案的地层沉降计算结果与理论预测结果对比分析,发现理论预测最大沉降量大模拟计算量17%,两种方法均具有一定合理性,但考虑到参数假定和实际施工扰动等多方面因素,仍需后续现场实测数据进行验证。
The rational sequence of group pipe jacking is one of the key measures to control stratum deformation in the space-time dimension,based on the modified Peck formula for the ground loss of single and double tunnel excavation at home and abroad,the calculation method of group pipe construction for ground loss considering the characteristics of pipe roof is proposed,while the ABAQUS finite element analysis software is used to study the group pipe jacking sequence and ground settlement under composite stratum based on an engineering case.The results show that the surface settlement curve of each jacking scheme is similar to the empirical Peck formula curve,and the depth of strata,jacking sequence,nature of geotechnical layer,and micro soil arching effect between pipes have influence on the settlement of strata;the C1 scheme of bottom-up jacking is more advantageous in controlling the settlement of strata,and the maximum settlement is reduced by about 35.6%compared with the C3 scheme.Finally,the calculation results of ground settlement of the preferred C1 scheme were compared with the theoretical prediction results,and it was found that the theoretical prediction of maximum settlement was 17%larger than the simulated calculation,and both methods were reasonable to some extent,but considering various factors such as parameter assumptions and actual construction disturbance,it is still necessary to verify the subsequent field measurement data.
作者
牛野
NIU Ye(China Railway Siyuan Survey&Design Group Co.,Ltd.,Wuhan 430063,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期2878-2887,共10页
Building Structure
关键词
管幕群管
顶进顺序优化
地层损失计算
数值模拟
沉降预测
pipe roof
optimization of jacking sequence
stratum loss calculation
numerical simulation
settlement prediction