基于盾构隧道施工力学特性的注浆加固方案比较分析
张社荣1,2郭紫薇1,2曹克磊1,2郭丽娜3高朗4陈娇4
Comparative Analysis of Grouting Reinforcement Schemes Based on Mechanical Characteristics of Shield Tunnel Construction
ZHANG SherongGUO ZiweiCAO KeleiGUO LinaGAO LangCHEN Jiao
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作者信息:1.天津大学水利工程仿真与安全国家重点实验室，300072，天津；
2.天津大学建筑工程学院，300072，天津；
3.云南工商学院建筑工程学院，651701，昆明；
4.中国水利水电第十四工程局有限公司，650051，昆明
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Affiliation:State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, 300072, Tianjin, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.09.031
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中图分类号/CLCN:U455.49
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栏目/Col:研究报告
摘要:
为了研究隧道注浆加固对盾构施工力学特性的影响，以昆明轨道交通5号线软弱地层盾构隧道下穿采莲河施工为例，运用Abaqus软件建立隧道施工三维计算模型，通过改变注浆范围及注浆压力等参数，提出6种注浆加固方案并对这6种加固方案下地表沉降和管片内力变形进行对比分析。研究结果表明：在该工程地质条件和施工因素下，选择上、下半断面分别局部注浆，并控制注浆压力0.1~0.2 MPa时注浆补偿效果最佳，此时地表沉降较未注浆时减小54.3%~66.9%，同时管片拉应力及内侧上浮量均满足控制要求；考虑注浆加固效果对地层弹性模量的直接影响，对其进行了敏感性分析，当注浆圈弹性模量由80 MPa增至100 MPa时，地表沉降减小了14.78%。故施工中应严格控制注浆质量，保证注浆加固范围及注浆压力在要求范围内，提高施工安全。
Abstracts:
In order to study the influence of tunnel grouting reinforcement on the mechanical characteristics of shield construction, taking Kunming Rail Transit Line 5 weak stratum shield tunnel construction under-crossing Cailian River as an example, a three-dimensional calculation model of tunnel construction is constructed using Abaqus software. By adjusting parameters such as grouting pressure and grouting scope, six types of grouting reinforcement schemes are proposed and the ground settlement and internal force deformation of segments under these six reinforcement schemes are compared and analyzed. Research results show that considering the engineering geological conditions and construction factors, the upper and lower half sections are selected for local grouting, and the grouting compensation effect is the best when the grouting pressure is controlled between 0.1 to 0.2 MPa, meanwhile surface settlement is reduced by 54.3%~66.9% compared to scenario without grouting, and the tensile stress of the segment and the amount of floating inside meet the control requirements. Considering the direct influence of the grouting reinforcement effect on the formation elastic modulus, a sensitivity analysis is conducted. When the modulus is increased from 80 MPa to 100 MPa, ground settlement decreases by 14.78%. Therefore, grouting quality should be strictly controlled during construction to ensure that the scope of grouting reinforcement and grouting pressure are within the required range, improving construction safety.
引文 / Ref:
张社荣，郭紫薇，曹克磊，等.基于盾构隧道施工力学特性的注浆加固方案比较分析[J].城市轨道交通研究，2021，24(9):147.
ZHANG Sherong，GUO Ziwei，CAO Kelei，et al.Comparative analysis of grouting reinforcement schemes based on mechanical characteristics of shield tunnel construction[J].Urban Mass Transit，2021，24(9)：147.
ZHANG Sherong，GUO Ziwei，CAO Kelei，et al.Comparative analysis of grouting reinforcement schemes based on mechanical characteristics of shield tunnel construction[J].Urban Mass Transit，2021，24(9)：147.
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