新意法在富水砂层的适用性研究

发布时间：2018-10-12 17:45

【摘要】：青岛地铁一期工程保河区间富水砂层段为典型的"上软下硬"地层,施工中采用了适合中国国情的"新意法",即"环向水平旋喷桩+超前注浆管"对富水砂层进行了加固。文章通过现场取样观测分析,研究了各种砂层中水平旋喷桩成桩效果及存在的问题;并通过现场监测结果针对采用"新意法"施工对工程及周边环境的影响进行了分析。研究结果表明:"新意法"在富水砂层应用中控制沉降效果明显,但施工中也存在桩间咬合不良导致的渗漏水及注浆压力控制不当引起地层隆起等问题;通过对桩体角度从水平和垂直两个方面进行控制和对注浆施工过程进行跟踪监测等方法,克服了"新意法"在富水砂层施工中存在的问题,施工结果表明"新意法"在富水砂层中具有良好的适用性。
[Abstract]:The section of water-rich sand bed in Baohe section of the first phase project of Qingdao Metro is a typical "upper soft and lower hard" stratum. The "new method" suitable for China's national conditions is adopted in the construction, that is, "horizontal rotary grouting pile advance grouting pipe" to reinforce the water-rich sand bed. Through field sampling observation and analysis, this paper studies the effect of horizontal rotary jet grouting pile in various sand layers and the existing problems, and analyzes the influence of the construction of "Xinyi method" on the engineering and its surrounding environment through the field monitoring results. The results show that the effect of "Xinyi method" on controlling settlement is obvious in the application of water-rich sand bed, but there are some problems in construction, such as leaking water caused by poor occlusion between piles and improper control of grouting pressure, etc. By controlling the angle of pile from horizontal and vertical aspects and monitoring the grouting construction process, the problems of "Xinyi method" in the construction of water-rich sand layer are overcome. The construction results show that Xinyi method has good applicability in water-rich sand beds.
【作者单位】：青岛地铁集团有限公司;中国海洋大学;北京城建设计研究总院有限责任公司;
【基金】：国家自然科学基金资助项目(41202204) 岩土及地下工程教育部重点实验室开发基金(KLE-TJGE-B1107) 青岛地铁科研课题(SDSITC-0108310)
【分类号】：U455.49

【参考文献】