望东长江大桥软土地基处理工艺研究

发布时间：2018-03-18 14:23

本文选题：软土地基　切入点：土工格栅　出处：《吉林大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于地质形成的复杂性、特殊性，在道路沿线路基下常常存在着很厚的软土层，软土层具有含水量高、压缩性强、孔隙比大等缺点，会直接影响到道路的稳定和安全。在这样的地基上修筑道路时，如果对路基采取的处理方式不符合要求，那么在这种情况下，就会因为道路地基沉降或差异沉降过大而危害到道路的使用功能。对道路软土地基的处理合适与否，会对路基的基础承载能力产生直接影响，另外这也是道路在运营阶段能否高效和安全运营的关键。因此，为了得到好的经济效益及社会效益，就要设计出正确合理的软土地基处理方案，并要保证能够迅速实施。本文对道路工程软土地基处理方案的选择进行了研究，本文在对多种软基处理方法进行了综述的基础上，，对各种软基处理方法进行了比较和分析，然后结合安徽望东长江大桥引桥段软土地基处理工程案例，主要对特定地质条件下和施工条件下的双向水泥搅拌桩、干振复合桩等软基处理技术进行了研究，提出了以上两种技术详细的施工工艺、工艺参数和材料参数，另外还介绍了本工程综合应用的挖除换填、土工格栅、土工格室、土工布、欠载预压等处理方案的施工工艺和材料参数。本论文结合安徽望东长江大桥引桥段道路软土地基处理实际工程进行的研究，提出的施工工艺和材料参数，经试验桩静载荷试验验证，效果良好，达到150kpa设计要求。研究结果对相似地质条件下的道路软基处理可提供有益参考。
[Abstract]:Due to the complexity and particularity of geological formation, there are many disadvantages under the roadbed along the road, such as high water content, strong compressibility, large porosity ratio and so on. It will directly affect the stability and safety of the road. If the treatment of the roadbed does not meet the requirements when building a road on such a foundation, then in this case, Because the settlement of the road foundation or the differential settlement is too large, it will endanger the function of the use of the road. Whether the treatment of the soft soil foundation of the road is appropriate or not will have a direct impact on the bearing capacity of the foundation of the roadbed. In addition, this is also the key to the efficient and safe operation of the road in the operation stage. Therefore, in order to obtain good economic and social benefits, we should design a correct and reasonable treatment scheme for soft soil foundation and ensure that it can be implemented quickly. In this paper, the selection of soft foundation treatment schemes for road engineering is studied. On the basis of summarizing various soft foundation treatment methods, various soft foundation treatment methods are compared and analyzed in this paper. Then combining with the soft foundation treatment project of the approach bridge section of Wangdong Yangtze River Bridge in Anhui Province, the paper mainly studies the soft foundation treatment technology of two-way cement mixing pile and dry vibration composite pile under specific geological conditions and construction conditions. The detailed construction technology, process parameters and material parameters of the above two technologies are put forward. In addition, the excavation replacement, geogrid, geogrid, geogrid, geotextile, geotextile and geotextile are also introduced. Construction technology and material parameters of underloading preloading and other treatment schemes. Based on the research of the actual engineering of soft soil foundation treatment in the approach section of Wangdong Yangtze River Bridge in Anhui Province, the construction technology and material parameters proposed are verified by the static load test of the test pile, and the results are satisfactory. The results of the study can provide a useful reference for the treatment of road soft foundation under similar geological conditions.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.55

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