当前位置:主页 > 科技论文 > 交通工程论文 >

钻爆法施工下穿既有隧道的影响研究

发布时间:2018-04-04 02:13

  本文选题:钻爆法 切入点:岩石爆破 出处:《中南大学》2014年硕士论文


【摘要】:钻爆法是硬岩隧道、短隧道等掘进施工的主要手段,主要由于其经济、施工方便灵活,但是其也可能会引起围岩、地表的强烈震动,这个问题在围岩软弱、衬砌质量差等情形中更显突出。同时,近年来随着我国交通基础设施建设的发展,平行、交叉小间距隧道工程增多,当两隧道距离较近时,由于爆破施工的振动影响,新建隧道在施工时可能导致既有隧道围岩与衬砌结构的变形甚至损坏从而危及行车安全。研究工程爆破影响的参数规律并依此制定相应的施工对策可以保证工程的安全性及其顺利完成。因此,本文采用数值模拟手段对典型的钻爆法正交下穿既有隧道情形进行参数影响分析并结合青岛地铁二号线斜交下穿的工程实例提出相应的施工对策。本文所做的主要工作: 1.本文以岩石爆破与应力波传播理论为基础,采用有限元软件Abaqus建立了钻爆施工下穿既有隧道的三维典型数值模型,详细讨论了模型建立涉及的材料模型以及材料的动力参数使用、体系阻尼设置、荷载施加、动力边界条件以及单元选择与网格划分等问题。对直交下穿情形的数值计算结果从能量角度并参考已有的类似情形实测结果讨论了可靠性。 2.参考大量文献,对交通隧道的爆破安全评价指标进行归纳,以衬砌的最大振速以及主拉应力值作为文中判断既有隧道安全性的指标。对直交隧道情形水平距、竖向距以及围岩级别进行了参数研究,讨论了这三种参数变化时既有隧道衬砌的最大振速、最大主拉应力的出现部位以及值的变化规律。 3.对青岛地铁二号线工程中新建隧道贴近下穿既有隧道的斜交情形进行了数值计算,提出此种紧贴下穿的施工对策,得出全断面爆破施工时的两个极限距离。
[Abstract]:Drilling and blasting method is the main means of hard rock tunnel, short tunnel and other tunneling construction, mainly because of its economy, convenient and flexible construction, but it may also cause strong vibration of surrounding rock and surface, this problem is weak in surrounding rock.The lining is more prominent in the case of poor quality.At the same time, with the development of traffic infrastructure construction in China in recent years, the number of parallel and cross-spaced tunnel projects increases. When the distance between the two tunnels is close, because of the vibration of blasting construction,The construction of new tunnel may lead to the deformation and even damage of surrounding rock and lining structure of existing tunnel, thus endangering the traffic safety.Studying the parameter law of engineering blasting effect and making corresponding construction countermeasures can ensure the safety and smooth completion of the project.Therefore, the numerical simulation method is used to analyze the influence of parameters on the typical drilling and blasting method in the case of the existing tunnel, and the corresponding construction countermeasures are put forward in the light of the engineering example of the oblique underpass of Qingdao Metro Line 2.The main work of this paper is as follows:1.Based on the theory of rock blasting and stress wave propagation, a typical three-dimensional numerical model of tunnel under drilling and blasting construction is established by using finite element software Abaqus.The material model, the use of material dynamic parameters, the system damping, the load application, the dynamic boundary conditions, the element selection and meshing are discussed in detail.The reliability is discussed from the point of view of energy and referring to the experimental results of similar cases.2.Referring to a large number of literatures, the blasting safety evaluation indexes of traffic tunnels are summarized, and the maximum vibration velocity and main tensile stress of lining are taken as the indexes to judge the safety of existing tunnels in this paper.In this paper, the horizontal distance, vertical distance and surrounding rock level of the straight intersection tunnel are studied. The maximum vibration velocity, the position of the maximum main tensile stress and the variation law of the value of the existing tunnel lining are discussed when the three parameters change.3.In this paper, the oblique intersection of the new tunnel passing through the existing tunnel close to the existing tunnel in Qingdao Metro Line 2 is numerically calculated, and the construction countermeasures are put forward, and the two limit distances in the construction of full section blasting are obtained.
【学位授予单位】:中南大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U455.41

【参考文献】

相关期刊论文 前10条

1 刘慧;邻近爆破对隧道影响的研究进展[J];爆破;1999年01期

2 李云鹏;艾传志;韩常领;霍明;;小间距隧道爆破开挖动力效应数值模拟研究[J];爆炸与冲击;2007年01期

3 鞠杨;环小丰;宋振铎;田鹭璐;毛彦U,

本文编号:1707918


资料下载
论文发表

本文链接:https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/1707918.html


Copyright(c)文论论文网All Rights Reserved | 网站地图 |

版权申明:资料由用户b4544***提供,本站仅收录摘要或目录,作者需要删除请E-mail邮箱bigeng88@qq.com