桥梁桩基在岩溶地区的施工技术探究

发布时间：2018-02-25 23:36

本文关键词： 岩溶桩基础稳定性施工技术质量事故　出处：《安徽理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国岩溶的分布相当广泛,在国民经济建设中,随着交通建设的飞速发展,岩溶的存在,常常给在岩溶地区桥梁基础的设计和施工带来了很大的影响。因此,对岩溶地区桥梁桩基础的施工进行系统的研究具有非常重要的实际意义。本文采用弹性力学理论对岩溶地区的桥桩梁基础稳定性进行了分析；采用极限平衡理论对在桥梁桩基础的作用下覆盖在岩溶临空面上的稳定性展开了研究。据此归纳总结几种常见的制约桩基稳定性的因素,推导出了基桩作用下覆盖在岩溶临空面的安全系数公式。同时,通过工程实例,对岩溶地区桥梁桩基础施工过程中经常出现的问题、产生的原因及预防措施、处理方法等进行分析,提出了在岩溶地区桥梁桩基础适宜的施工方法有人工挖孔灌注桩、钻成孔灌注桩以及冲击成孔灌注桩等,具体的处理措施有优先采用人工挖孔桩,钢护筒要紧贴着不透水层,抛粘土块和片石,钻具要安装得当,导向架的增设,控制合理的进尺。在分析岩研究溶地区桥梁桩基成孔选型制约因素的基础上,得出了桩基成孔施工在对应各种岩溶形态时的选型。论文研究成果为在岩溶地区桥梁桩基础施工方法的选择、质量的控制以及施工工序的制定提供了有益参考。
[Abstract]:Is widely distributed in China karst, in the construction of national economy. With the rapid development of traffic construction, the existence of karst, often to the design and construction of bridge foundation in karst area has brought great influence. Therefore, it has very important practical significance to study the construction of bridge pile foundation in karst area of the system.
In this paper, using the theory of elasticity of karst pile foundation beam stability analysis; using limit equilibrium theory to investigate the stability of the bridge pile foundation under the effect of cover on the karst surface. According to summarize several common factors restricting the stability of pile foundation, pile foundation is derived under the action of covering the safety factor karst of the formula. At the same time, through the project, often appear on the construction process of bridge pile foundation in karst area of problems, causes and preventive measures of the treatment methods were analyzed, put forward the construction method of bridge pile foundation in karst area for artificial dig hole pile and drilling hole pile the impact of cast-in-place pile, concrete treatment measures have the priority of using artificial dig hole pile, steel tube to cling to the impermeable layer, throwing Clay Lumps and rubble, drill to install Well, adding the guide frame, reasonable control. In the analysis of rock dissolution of footage in bridge pile hole selection constraints on the basis of the selection of the pile hole construction in Karst form corresponding to the various.
The research results of the paper provide useful reference for the selection of the construction method of bridge pile foundation in karst area, the control of the quality and the formulation of the construction procedure.

【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.551

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