超前预加固技术在城市浅埋暗挖隧道中的研究与应用

发布时间：2018-05-31 07:48

本文选题：浅埋暗挖 + 超前预加固　；参考：《合肥工业大学》2015年硕士论文

【摘要】：二十一世纪,城市地下工程建设的高峰时代已经到来。伴随着我国综合国力的提高,许多大城市都跻身于国际大都市,其城市现代化建设正在提速。最能反映这一特征的是,为缓解日益增加的交通压力而大规模进行的城市地铁建设。为阐明城市浅埋暗挖隧道地层预加固的作用机理及其力学行为,并以达到应用于工程的目的,本文以在建合肥市轨道交通1号线某暗挖区间为工程依托,采用了理论研究、数值模拟研究以及现场试验研究的综合研究方法。具体研究内容如下：(1)系统的研究了城市浅埋暗挖隧道工作面开挖过程中围岩变形机理、变形特征及其影响因素；(2)对浅埋暗挖隧道工作面地层超前预加固的作用机理进行了深入探讨,旨在揭示地层、支护结构和预加固结构之间相互作用的力学机制；(3)对浅埋暗挖隧道普遍采用的超前小导管注浆预加固技术,在不注浆、注浆不饱满以及注浆饱满条件下建立统一力学模型；(4)运用Midas GTS NX有限元软件对暗挖隧道在有、无超前预加固情况下的施工过程进行三维数值模拟,结合现场专题监测以反馈小导管注浆预加固技术的可行性及实际效用。
[Abstract]:In the 21 century, the peak time of urban underground engineering construction has come. With the improvement of our country's comprehensive national strength, many big cities are among the international metropolis, and their urban modernization is accelerating. What best reflects this characteristic is the large-scale construction of urban subway to ease the increasing traffic pressure. In order to elucidate the mechanism and mechanical behavior of pre-reinforcement of shallow buried underground tunnel, and to achieve the purpose of application in engineering, this paper, based on a hidden excavation section of No. 1 railway line of Hefei, is studied theoretically. The method of numerical simulation and field test. The specific research contents are as follows: (1) the deformation mechanism of surrounding rock during excavation of shallow buried tunnel face in city is studied systematically. In order to reveal the formation, the deformation characteristics and its influencing factors are discussed in detail, and the mechanism of the pre-reinforcement of the subsurface excavation working face is discussed in detail in order to reveal the formation. The mechanical mechanism of interaction between the supporting structure and the pre-strengthened structure is generally used in shallow tunneling with small ducts in advance grouting pre-reinforcement technology in the absence of grouting, In this paper, a unified mechanical model is established under the condition of non-plump grouting and full grouting. Midas GTS NX finite element software is used to simulate the construction process of the tunneling under the condition of no pre-reinforcement and no advance reinforcement. The feasibility and practical utility of pre-reinforcement technology with feedback small pipe grouting combined with field monitoring.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

【相似文献】