浅埋隧道不同开挖方式对地表沉降的影响

发布时间：2018-05-18 20:56

  本文选题：浅埋暗挖法隧道施工 + 地表沉降　； 参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：我国近几年的城市化发展迅速,城市规模不断扩大,地上交通压力随之越来越大,地下交通模式被更多的运用到城市建设当中。地铁一般建设在人口密集、地上建筑较多或者有城市主干道的地段。为了不影响地上交通与建筑,在一些隧道开挖过程中只能采用暗挖法。浅埋暗挖工程中,地表沉降是一项十分重要的安全参考因素,通过地表沉降的累积量与速率可以大致了解工程现阶段的状况。在本文中,首先介绍了浅埋暗挖法施工的原理与常见施工方法,之后介绍了对地表沉降影响的研究的发展状况,还介绍了实际工程中监控测量的实施。文章主体部分是对实际监测数据的分析与相关的数值模拟,依据温阳路站的实际工程资料与监测数据,结合理论分析与数值模拟结合方法,运用MIDAS/GTS进行施工过程模拟,分析不同开挖支护方式对地表沉降的影响,得出以下几点结论:1、实际工程中对管线变形限制严格的区域需要布置标准管线沉降监测点,不能用简易监测点代替;2、隧道纵向上,开挖段面的影响区域在3倍洞径范围,超过3倍洞径后影响减小,在1到1.5倍洞径区域内影响最大,此时地表沉降速率最大。横向上沉降规律基本符合Peck公式所描素,沉降槽呈正态分布趋势。3、在本文类似工程条件下,采用不同开挖支护方案对地表沉降的影响按从小到大排序为:双侧壁导洞法、CD法、单侧壁导洞法、台阶法、全断面开挖法。台阶法开挖产生的沉降值比CD法与单侧壁导洞法多出50%左右。在隧道截面与本工程类似的情况下不适宜采用全断面开挖方式;4、隧道开挖过程中支护体系受力主要位于隧道截面的肩部与仰拱两侧,在进行支护结构设计时应当增加这些部位支护结构的强度。
[Abstract]:In recent years, the urbanization in China has developed rapidly, the scale of the city is expanding, and the pressure on the ground is becoming more and more heavy. The underground transportation mode is more used in the urban construction. The subway is generally built in a densely populated, ground building or the main road of the city. In order to not affect the ground traffic and construction, some tunnels are in the tunnel. In the process of excavation, the method of excavation can only be used. In shallow excavation, ground subsidence is a very important safety reference factor. Through the accumulation and rate of surface subsidence, the current state of the project can be roughly understood. In this paper, the principle and common construction methods of shallow buried excavation method are introduced first, and then the ground is introduced. The development of the research on the influence of the surface subsidence and the implementation of the monitoring and measuring in the actual project. The main part of the article is the analysis of the actual monitoring data and the related numerical simulation. According to the actual engineering data and the monitoring data of the Wen Yang Road station, combining the theoretical analysis with the numerical simulation method, the construction process is carried out by MIDAS/GTS. Simulation and analysis of the influence of different excavation and support methods on the surface subsidence, draw the following conclusions: 1, in the actual project, the area where the pipeline deformation is restricted strictly requires the arrangement of standard pipeline settlement monitoring points, and can not be replaced with simple monitoring points; 2, the tunnel vertical, the area of the excavation section is over 3 times the diameter of the hole, over 3 times the hole diameter. The effect is greatest in the area of 1 to 1.5 times the diameter of the hole, and the surface subsidence rate is the largest. The law of lateral subsidence is basically in line with the Peck formula, and the settlement trough is.3. Under the similar engineering conditions, the effect of different excavation support schemes on the surface subsidence is: the double wall guide method, CD Method, single side wall guide, step method, full section excavation method, the settlement value produced by step method is more than 50% more than that of CD method and single side wall guide hole method. Under the similar situation of tunnel section with this project, the full section excavation method is not suitable. 4, the force of the support system is mainly located in the shoulder and the inverted arch of the tunnel section during the tunnel excavation. On the side, the strength of supporting structures should be increased when supporting structure design is carried out.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.4;TU433
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本文编号：1907176