新奥法的不同施工方法下山岭隧道围岩稳定性研究
发布时间:2018-10-31 17:15
【摘要】:近年来,随着经济的发展,交通基础设施建设逐步加快。特别是西部大开发战略的实施和四纵四横高铁的建设,隧道建设被推向了新的高峰。隧道在未来几年内将不断增多。围岩稳定是隧道安全施工的基本条件,如何维持隧道围岩稳定是隧道工程最基本的问题之一,因此国内外学者应用各种研究方法对围岩稳定性开展了大量研究工作,并取得了丰硕成果。 本文以津秦客运专线葫芦山隧道工程为背景,分析了三台阶法、两台阶法、全断面法三种不同施工方法对围岩稳定性的影响。论文的主要内容和结论包括: 首先选取变形较大的断面作为典型断面,分析造成变形的原因。得出结论:三种施工方法的围岩变形均经历了开挖前超前位移释放阶段,急剧变形阶段、缓慢变形阶段和变形稳定等四个阶段。其中急剧变形阶段变形量大,最易发生失稳破坏。 其次对一般性断面(即具有完整监测数据的全部断面)变形稳定时的净空收敛值、拱顶沉降值以及急剧变形阶段的持续时间三个量进行统计分析,采用正态分布拟合的方法,论证了三台阶法、两台阶法和全断面法的适用性。并且得出,绝大多数的监测断面都会在1个月后完成急剧变形,进入缓慢变形阶段。因此开挖一个月后是施做二衬的最佳时机。 第三分别对三台阶法、两台阶法和全断面法三种施工方法下围岩的变形规律进行数值模拟研究,并将研究结果与实测数据进行对比分析,得出:围岩的变形规律主要为拱顶向下沉降,遂底向上隆起,围岩两侧向中间收敛。隧道开挖对围岩的影响主要在4-5倍的洞径范围内。最大位移发生在拱顶、拱肩和拱脚处,并向周围扩散。 并且对V级围岩条件下,三台阶法和进行短台阶、短进尺优化后的两台阶法的模拟结果进行对比,论证了V级围岩条件下两台阶法的适用性。为类似的隧道工程提供有益的工程依据。
[Abstract]:In recent years, along with the economic development, the transportation infrastructure construction speeds up step by step. Especially the implementation of western development strategy and the construction of four vertical and four horizontal high-speed railway, tunnel construction has been pushed to a new peak. Tunnels will continue to increase in the coming years. The stability of surrounding rock is the basic condition of the safe construction of tunnel. How to maintain the stability of surrounding rock is one of the most basic problems in tunnel engineering. Therefore, scholars at home and abroad have carried out a lot of research work on the stability of surrounding rock by using various research methods. And achieved fruitful results. Based on the Hulushan Tunnel Project of Jin-Qin passenger dedicated Line, this paper analyzes the influence of three different construction methods on the stability of surrounding rock. The main contents and conclusions are as follows: firstly, select the section with large deformation as the typical section and analyze the cause of deformation. It is concluded that the surrounding rock deformation of the three construction methods has experienced four stages, namely, advance displacement release stage, sharp deformation stage, slow deformation stage and deformation stabilization stage before excavation. In the stage of rapid deformation, the amount of deformation is large, and the instability is most likely to occur. Secondly, the convergence value of clearance, the settlement value of arch roof and the duration of sharp deformation stage of general section (that is, all sections with complete monitoring data) are analyzed statistically, and the normal distribution fitting method is used. The applicability of three class law, two class method and full section method is demonstrated. It is concluded that most of the monitoring sections will deform rapidly after one month and enter the stage of slow deformation. So a month after excavation is the best time to make two linings. Thirdly, the deformation law of surrounding rock under three construction methods, three class method, two step method and full section method, are studied by numerical simulation, and the results are compared with the measured data. It is concluded that the deformation law of the surrounding rock is the downward subsidence of the arch roof, the uplift of the bottom and the convergence of the surrounding rock to the middle. The influence of tunnel excavation on surrounding rock is mainly in the range of 4-5 times diameter. Maximum displacement occurs at the vault, shoulders and arches and diffuses around. And the simulation results of three step method and two class method after short step and short scale optimization under V class surrounding rock condition are compared, and the applicability of two class method under V class surrounding rock condition is proved. It provides beneficial engineering basis for similar tunnel engineering.
【学位授予单位】:北京交通大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U451.2
本文编号:2303002
[Abstract]:In recent years, along with the economic development, the transportation infrastructure construction speeds up step by step. Especially the implementation of western development strategy and the construction of four vertical and four horizontal high-speed railway, tunnel construction has been pushed to a new peak. Tunnels will continue to increase in the coming years. The stability of surrounding rock is the basic condition of the safe construction of tunnel. How to maintain the stability of surrounding rock is one of the most basic problems in tunnel engineering. Therefore, scholars at home and abroad have carried out a lot of research work on the stability of surrounding rock by using various research methods. And achieved fruitful results. Based on the Hulushan Tunnel Project of Jin-Qin passenger dedicated Line, this paper analyzes the influence of three different construction methods on the stability of surrounding rock. The main contents and conclusions are as follows: firstly, select the section with large deformation as the typical section and analyze the cause of deformation. It is concluded that the surrounding rock deformation of the three construction methods has experienced four stages, namely, advance displacement release stage, sharp deformation stage, slow deformation stage and deformation stabilization stage before excavation. In the stage of rapid deformation, the amount of deformation is large, and the instability is most likely to occur. Secondly, the convergence value of clearance, the settlement value of arch roof and the duration of sharp deformation stage of general section (that is, all sections with complete monitoring data) are analyzed statistically, and the normal distribution fitting method is used. The applicability of three class law, two class method and full section method is demonstrated. It is concluded that most of the monitoring sections will deform rapidly after one month and enter the stage of slow deformation. So a month after excavation is the best time to make two linings. Thirdly, the deformation law of surrounding rock under three construction methods, three class method, two step method and full section method, are studied by numerical simulation, and the results are compared with the measured data. It is concluded that the deformation law of the surrounding rock is the downward subsidence of the arch roof, the uplift of the bottom and the convergence of the surrounding rock to the middle. The influence of tunnel excavation on surrounding rock is mainly in the range of 4-5 times diameter. Maximum displacement occurs at the vault, shoulders and arches and diffuses around. And the simulation results of three step method and two class method after short step and short scale optimization under V class surrounding rock condition are compared, and the applicability of two class method under V class surrounding rock condition is proved. It provides beneficial engineering basis for similar tunnel engineering.
【学位授予单位】:北京交通大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U451.2
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