基于TBM掘进技术的水工隧洞预制管片优化设计及稳定性评价

发布时间：2018-04-13 08:57

  本文选题：水工隧洞 + 混凝土配合比　； 参考：《甘肃农业大学》2016年硕士论文

【摘要】：我国的水工隧洞建设正处于蓬勃发展的状态,有些方面的技术已处于国际领先水平,但是在隧洞的施工及衬砌技术上,与国外相比还有些不足。近年来,我国隧洞开挖及衬砌技术发展迅猛,由于TBM掘进技术有着诸多优点,目前已成为我国隧道施工的主要方法。本文以引洮供水一期工程7#隧洞为基础建立模型,基于7#隧洞所属湿陷性黄土区及TBM全断面掘进预制管片衬砌的特性,开展TBM预制混凝土管片配合比设计与优化及衬砌管片的稳定性评价,主要进行以下几个方面的研究：(1)TBM预制混凝土管片配合比设计与优化,基于天然料场骨料质量评价,在掌握水泥、水、掺合料、外加剂理化性能的基础上,为使混凝土在经济性、工作性、强度等方面达到最优,分别利用主成分分析法和功效函数法对混凝土管片配合比进行了优化,且两种方法的优化结果相近。(2)衬砌管片受力分析,管片衬砌上的围岩压力是管片承受的主要荷载,本文对水工隧道上的围岩压力计算方式根据实际工程进行了详细的计算,并确定了其合理的取值。(3)优化后混凝土衬砌管片的稳定性评价,在有限元分析软件ANSYS中建立二维及三维隧洞、管片结构模型的基础上,模拟计算工况荷载作用下衬砌结构受力特点,得到管片衬砌内的等效应力和最大、最小主应力分布,以及管片衬砌内各点的位移变形分布,掌握该TBM掘进隧洞管片衬砌结构易发生集中应力和位移变形部位,可能会导致发生的裂缝、错台以及边角破碎现象。依据受力分析结果,评价了管片受力的稳定性。综上,以试验检测为平台,通过理论分析、室内实验、现场调查相结合的方法,来研究TBM预制混凝土管片配合比设计与优化以及衬砌管片的稳定性分析,其成果为TBM掘进技术在我省水工隧洞中的应用提供技术储备和科技支撑。本文应用主成分分析法和功效函数法优化原理,分别选取不同的评价指标,对优化C45混凝土管片配合比均能起到较好的效果。利用ANSYS有限元软件对优化后的混凝土管片衬砌结构的受力情况,进行实际工况模拟分析,得出了一些结论,对水工隧洞的施工具有一定的指导意义。
[Abstract]:The construction of hydraulic tunnel in China is in a booming state, some aspects of the technology has reached the international advanced level, but in the construction and lining of tunnel technology, compared with foreign countries has some shortcomings. In recent years, the development of tunnel excavation and lining technology in China rapidly, due to the TBM tunneling technology has many advantages, at present has become the main method of tunnel construction in China. Based on the Taohe River Water Transfer Project 7# tunnel model as the foundation, characteristics of collapsible loess and TBM TBM precast lining of 7# tunnel is carried out based on the TBM of precast concrete segments, mix design and stability evaluation and optimization of lining, the main for the following research: (1) compared with the TBM design and optimization of precast concrete segments, natural aggregates quality evaluation based on the grasp of water, cement, admixture, admixture physicochemical properties On the basis of the concrete work in the economy, and achieve the optimal strength, using principal component analysis method and efficacy coefficient method to optimize the concrete mix ratio segment, and two kinds of optimization methods, similar results. (2) stress analysis of lining and surrounding rock pressure on the lining is the main load bearing segment, the calculation of surrounding rock pressure hydraulic tunnel on the way are calculated in detail according to the actual engineering, and determine its reasonable value. (3) the stability evaluation of concrete lining after optimization, building 2D and 3D tunnel in the finite element analysis software ANSYS, based on the model of segment structure the simulation calculation, the stress characteristics of lining structure under the effect of load, the equivalent stress in the lining and the maximum and minimum principal stress distribution and displacement of each point in the lining deformation distribution, the TBM The lining structure of tunnel is prone to concentrated stress and displacement and deformation of parts, may lead to crack, dislocation and edge breakage. According to the stress analysis results, to evaluate the stability of segment stress. Therefore, in order to test the platform, through theoretical analysis, laboratory experiment method, combining the field investigation the study of TBM precast concrete segments, mix design and optimization and stability of lining segment analysis, the results provide technical reserves and technical support for the application of TBM tunneling technology in our province in the tunnel. The analysis method and effect function method optimization based on the principle of principal components were selected for different evaluation indexes, to optimize the C45 the concrete segment mix can play a better effect. By using the finite element software ANSYS stress on concrete lining structure after optimization, simulated the actual conditions In addition, some conclusions have been obtained, which have certain guiding significance for the construction of hydraulic tunnel.

【学位授予单位】：甘肃农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV554
，

本文编号：1743803