跨河大直径盾构施工地表沉降及注浆加固研究
发布时间：2018-11-10 20:27
【摘要】：随着我国的地下交通建设进入到了如火如荼的发展时期,在进行地铁建设时,利用盾构进行地下隧道施工已经成为了主流。大直径盾构施工会对地层的稳定性产生影响,会对地表沉降产生较大影响,研究分析大直径盾构在掘进开挖时影响因素对地表沉降的影响规律有重大意义。本文以分析地表沉降的变化规律为主要研究目标,利用三维有限元数值模拟的方法,分析总结了大直径盾构施工主要影响因素对地表沉降的影响规律,并结合实际工程,分析了对地层注浆产生的加固效果。本论文主要做了以下工作： (1)本文首先通过查阅相关文献总结分析了盾构法施工对地层的扰动过程和地层的变形因素。通过建立三维有限元数值模型,选取在大直径盾构施工过程中对地表影响较大的因素进行分析,详细地分析总结了影响因素对地表沉降的影响规律。 (2)本文以天津地下直径线穿越海河为研究背景,通过理论推导,推导出隧道最小覆土层厚度的三个公式。通过建立三维有限元数值模型,精细地对盾构穿越海河河底进行了数值模拟,重点研究了盾构在无注浆和注浆情况下的河底地表沉降的对比分析。利用无线监测信息管理与预警系统对盾构施工工程中河底地表的沉降进行了实时监测,并与数值模拟结果进行了比照。 通过分析可知,土的物理力学性质(弹性模量、内摩擦角、粘聚力)、掘进面支护力、开挖步距、隧道埋深都对地表沉降有较大的影响,且变形规律明显,为工程施工参数提供了一定的参考。经隧道上覆土厚度公式进行验证,隧道上覆土厚度不能满足要求,需采取保证安全的措施。经数值分析得知,盾构在穿越无注浆加固的河底时,会造成河底地表沉降过大。在经过注浆加固后,河底地表沉降明显变小,注浆加固明显。通过与现场监测数据进行对比分析,数值模拟分析基本符合实际监测结果,说明建立的模型及选取的参数合理,可以真实反应盾构下穿海河的全过程,为之后类似的工程前期预测提供了一定参考。
[Abstract]:With the development of underground traffic construction in China, the underground tunnel construction by shield tunneling has become the mainstream in subway construction. The construction of large diameter shield will affect the stability of stratum and the surface settlement. It is of great significance to study and analyze the influencing factors of large diameter shield tunneling on the surface settlement. In this paper, the main research objective is to analyze the variation law of surface subsidence, and by using the method of three-dimensional finite element numerical simulation, this paper analyzes and summarizes the influence law of the main factors of large diameter shield construction on the surface settlement, and combines with the actual engineering. The reinforcement effect of stratum grouting is analyzed. The main work of this paper is as follows: (1) in this paper, the disturbance process and deformation factors of shield construction to strata are summarized and analyzed by consulting relevant documents. Through the establishment of a three-dimensional finite element numerical model, the factors that have a great influence on the surface during the construction of large-diameter shield are selected and the influence law of the influencing factors on the surface settlement is analyzed and summarized in detail. (2) based on the research background of Tianjin underground diameter line crossing the Haihe River, three formulas for the minimum overlying soil thickness of the tunnel are derived through theoretical derivation. Through the establishment of three-dimensional finite element numerical model, the numerical simulation of shield passing through the bottom of Haihe River was carried out in detail, and the comparative analysis of the ground subsidence of shield under the condition of no grouting and grouting was studied. Based on the wireless monitoring information management and early warning system, the real-time monitoring of the surface subsidence of the river bottom in shield construction project is carried out, and the results are compared with the numerical simulation results. The physical and mechanical properties of the soil (elastic modulus, angle of internal friction, cohesion), the supporting force of the excavation surface, the distance between the excavation steps and the depth of the tunnel have great influence on the surface settlement, and the deformation law is obvious. It provides a certain reference for engineering construction parameters. It is proved by the formula of overlying soil thickness that the overlying soil thickness of the tunnel can not meet the requirements, and some measures should be taken to ensure the safety of the overlying soil. Through numerical analysis, it is found that shield tunneling will cause excessive surface subsidence when crossing the river bottom without grouting reinforcement. After grouting reinforcement, the surface subsidence of the river bottom is obviously smaller, and the grouting reinforcement is obvious. By comparing and analyzing the field monitoring data, the numerical simulation analysis basically accords with the actual monitoring results. It shows that the established model and the selected parameters are reasonable and can truly reflect the whole process of crossing the Haihe River under shield tunneling. It provides a certain reference for the prediction of similar projects.
【学位授予单位】：北京建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43
本文编号：2323532
[Abstract]:With the development of underground traffic construction in China, the underground tunnel construction by shield tunneling has become the mainstream in subway construction. The construction of large diameter shield will affect the stability of stratum and the surface settlement. It is of great significance to study and analyze the influencing factors of large diameter shield tunneling on the surface settlement. In this paper, the main research objective is to analyze the variation law of surface subsidence, and by using the method of three-dimensional finite element numerical simulation, this paper analyzes and summarizes the influence law of the main factors of large diameter shield construction on the surface settlement, and combines with the actual engineering. The reinforcement effect of stratum grouting is analyzed. The main work of this paper is as follows: (1) in this paper, the disturbance process and deformation factors of shield construction to strata are summarized and analyzed by consulting relevant documents. Through the establishment of a three-dimensional finite element numerical model, the factors that have a great influence on the surface during the construction of large-diameter shield are selected and the influence law of the influencing factors on the surface settlement is analyzed and summarized in detail. (2) based on the research background of Tianjin underground diameter line crossing the Haihe River, three formulas for the minimum overlying soil thickness of the tunnel are derived through theoretical derivation. Through the establishment of three-dimensional finite element numerical model, the numerical simulation of shield passing through the bottom of Haihe River was carried out in detail, and the comparative analysis of the ground subsidence of shield under the condition of no grouting and grouting was studied. Based on the wireless monitoring information management and early warning system, the real-time monitoring of the surface subsidence of the river bottom in shield construction project is carried out, and the results are compared with the numerical simulation results. The physical and mechanical properties of the soil (elastic modulus, angle of internal friction, cohesion), the supporting force of the excavation surface, the distance between the excavation steps and the depth of the tunnel have great influence on the surface settlement, and the deformation law is obvious. It provides a certain reference for engineering construction parameters. It is proved by the formula of overlying soil thickness that the overlying soil thickness of the tunnel can not meet the requirements, and some measures should be taken to ensure the safety of the overlying soil. Through numerical analysis, it is found that shield tunneling will cause excessive surface subsidence when crossing the river bottom without grouting reinforcement. After grouting reinforcement, the surface subsidence of the river bottom is obviously smaller, and the grouting reinforcement is obvious. By comparing and analyzing the field monitoring data, the numerical simulation analysis basically accords with the actual monitoring results. It shows that the established model and the selected parameters are reasonable and can truly reflect the whole process of crossing the Haihe River under shield tunneling. It provides a certain reference for the prediction of similar projects.
【学位授予单位】：北京建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43
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