【作者】 张科；

【导师】 刘耀东；

【作者基本信息】 湖北工业大学 ， 桥梁与隧道工程， 2018， 硕士

【摘要】 地铁盾构隧道施工会导致周围土体的应力重分布,使土体产生位移,进而对周围建(构)筑物产生影响。基于盾构及既有建(构)筑物安全考虑,研究盾构施工过程中对邻近建(构)筑物的影响有重大工程意义,可以为今后类似地铁施工提供参考。以深圳地铁九号线向西村站~文锦站为工程背景,根据实测地质资料和工程组织设计资料,运用Midas GTS NX,研究了盾构施工过程中地层的沉降对邻近单桩及群桩的变形影响,并对桩基进行了内力分析。主要研究成果如下:(1)介绍了盾构施工的原理,阐述了地层沉降的机理和桩基受力特征,解释了Midas GTS NX模拟盾构施工的实现过程。(2)利用Midas GTS NX建立了桩基和隧道的三维模型,对盾构施工过程中的地层沉降情况进行了分析。研究了相同桩长不同桩位及相同桩位不同桩长的桩在盾构施工影响下的变形和内力变化规律。(3)分析了盾构施工过程中群桩的变形规律以及内力变化规律,并将群桩与单桩的受力情况进行对比,总结遮拦效应在群桩中的作用规律。研究成果总结了桩基在盾构施工过程中内力及状态的变化规律,能为施工安全及桩基加固提供参考。更多还原

【Abstract】 Subway shield tunnel construction will cause stress redistribution around the surrounding soil,resulting in displacement of the soil,and then impact on the surrounding buildings.Based on the safety consideration of the shield and existing buildings,it is of great significance to study the influence of the shield construction on the adjacent buildings.It can provide reference for the similar subway construction in the future.Taking the West Village station to Wen Jin station of Shenzhen subway line nine as the engineering background,according to the measured geological data and the design data of the engineering organization,Based on Midas GTS NX,the influence of stratum settlement on the deformation of adjacent single pile and pile group during shield construction is studied,and the internal force of pile foundation is analyzed.This article is mainly studied in the following aspects:(1)Introduced the shield construction principle,elaborated the stratum subsidence mechanism and the pile bearing characteristic,explained the Midas GTS NX simulation shield construction realization process.(2)The deformation and internal force variation of piles with different pile position of the same pile length and different pile length of the same pile position are studied under the influence of shield construction.(3)The deformation rule and internal force variation rule of pile group during shield construction are analyzed.And the pile group and the stress of single pile are studied,the regularity effect of shielding effect in pile group in.The research results in this paper summarize the performance change of pile foundation during shield construction,which provides a theoretical basis for subway construction and design,and provides reference for pile foundation reinforcement.更多还原