水中钻孔桩遇溶洞复杂地质处理施工技术研究

发布时间：2018-04-12 06:48

本文选题：溶洞地段 + 钻孔灌注桩　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：目前,随着国民经济的蓬勃发展,钻孔灌注桩作为公路、铁路、市政等桥梁基础的首选,其设计理论和施工工艺日臻完善。但由于钻孔灌注桩的施工具有高度的隐蔽性,其过程控制往往比上部结构更为复杂,更容易造成质量隐患。影响成桩质量的原因很多,其中溶洞处理就是一项很重要的工作。如若处理不当,就会产生各种质量事故,可能对国家财产造成重大损失。很久以来,在处理桥梁桩基钻孔施工溶洞方面,大多采用抛填片石加粘土、下钢护筒、注浆、灌注低标号混凝土等处理措施。然而,由于地区的差异性、地质的复杂性,若仅采用上述处理方法中的某一种往往是不足以有效解决复杂地质溶洞问题的,尤其是上层为淤泥质粘土,下层为灰岩地质的溶洞地质状况。本案例钻孔桩在钻孔过程中采用下钢护筒和抛填片石、黏土相结合的方式堵塞溶洞,达到稳固孔壁、保证成孔的目的。本文结合江西九江赛城湖跨湖大桥对水中钻孔灌注桩遇溶洞地段工程实例桩基施工工艺进行了研究,提出了一套完整的施工质量控制系统。溶洞地段钻孔桩施工的难点在于工程地质条件的连续性遭到了岩溶地貌特征的破坏,与普通地质条件相比,技术难度更为复杂,病害类型较多,常见的施工病害有漏浆、漏混凝土、卡钻、埋钻及偏孔等。本文结合施工实践,对水中钻孔灌注桩遇溶洞复杂地质处理段技术进行了总结,并有针对性地提出了适于不同类型溶洞的处理方法,以及常见施工问题的处理措施。对于岩溶地段水中钻孔灌注桩施工工艺的技术研究,可以更好地指导类似工程项目的建设,加快建设进程,以确保过程的安全性,减少质量事故,提高社会效益和经济效益。
[Abstract]:At present, with the rapid development of the national economy, as the highway, railway and municipal bored pile, bridge foundation for its design theory and construction technology to improve it. But due to the high concealment of the construction of bored piles, the process control more often than the upper structure is more complex, more easily lead to quality problems. The effect of pile quality of many reasons, the karst treatment is a very important work. If handled improperly, it will produce a variety of quality accidents, may cause serious damage to national property. For a long time, in the treatment of pile foundation construction of bridge drilling, used mostly filled with clay under the rubble, steel tube, grouting. In low grade concrete treatment measures. However, due to the difference of the area, the geological complexity, if only by this method in a certain is often not sufficient to effectively solve the complex geology Karst problem, especially the upper silty clay, lower karst geological conditions of limestone. The case of bored pile in drilling process using steel tube and rubble stone, clay combination block cave, stabilize the hole wall, ensure drilling purposes. This paper combined with the Jiangxi Jiujiang Lake City cross Lake Bridge were studied on water bored pile in Karst Section of engineering pile foundation construction technology, puts forward a complete set of construction quality control system. Lots of difficulties in the construction of bored pile in karst engineering geological conditions of the continuity was the feature of karst landform damage, compared with the general geological conditions, technology the difficulty is more complex, more types of diseases are common diseases, construction leakage, leakage of concrete, drill, drill and partial holes. This paper combined with the construction practice, the water bored pile in karst cave complex geological process Some techniques are summarized, and puts forward the treatment method for different types of karst, treatment measures and common construction. The construction technology of bored pile in karst area of water technology, can better guide the construction of similar projects, speed up the construction process, to ensure the safety of the process, reduce the quality accident, to improve the social and economic benefits.

【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.551

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