承压水对水泥粉煤灰碎石桩施工质量的影响及对策  

Influence of confined water on the bearing capacity of cement-fly ash-gravel piles and its countermeasures

作　　者：夏长华 江宁 唐君 李鹏 王闻[4] Xia Changhua;Jiang Ning;Tang Jun;Li Peng;Wang Wen(State Key Laboratory of Building Safety and Built Environment,Beijing 100013,China;China Academy of Building Research Foundation Institute,Beijing 100013,China;Beijing Engineering Technology Research Center of Foundation and City Underground Space Development and Utilization,Beijing 100013,China;China Institute of Water Resoures and Hydropower Research,Beijing 100038,China)

机构地区：[1]建筑安全与环境国家重点实验室,北京100013 [2]中国建筑科学研究院有限公司地基基础研究所,北京100013 [3]北京市地基基础与地下空间开发利用工程技术研究中心,北京100013 [4]中国水利水电科学研究院,北京100038

出　　处：《建筑科学》2021年第11期153-158,164,共7页Building Science

摘　　要：在地质勘探过程中,受工艺措施影响,一方面地下承压水情况无法查明,另一方面往往忽视地下承压水对工程基础建设的影响甚至危害。在地基处理尤其是在深基础处理工程的施工过程中,要加强对地下承压水的勘探。施工时条件适宜时,应该优先考虑其他施工工艺,如泥浆护壁成孔水下灌注商品混凝土工艺减轻承压水对承载力的影响;采用CFG桩进行地基处理时需采取降低承压水水头的辅助措施;加强施工过程控制,采用大功率长螺旋钻机,放慢提钻速度,商品混凝土能确保单桩灌注量,考虑超灌混凝土等综合预防措施减轻或避免承压水对工程质量的影响。In the process of geological exploration, on the one hand, the confined water can’t be ascertained affected by technical measures, on the other hand, the influence and harm of confined water on engineering infrastructure is often neglected. In the process of foundation treatment, especially in the construction of deep foundation treatment, the exploration of confined water should be strengthened. When the construction conditions are suitable, other construction techniques should be given priority, such as slurry wall drilling and underwater pouring of ready-mixed concrete to reduce the bearing capacity of confined water, auxiliary measures for reducing the head of confined water, and in strengthening construction process control: adopting high-power long spiral drill, slowing down drilling speed, ensuring single pile pouring quantity of ready-mixed concrete, considering over-pouring concrete and other comprehensive preventive measures to reduce or avoid the influence of confined water on engineering quality.

关 键 词：承压水 CFG桩 长螺旋 完整性 

分 类 号：TU473.1[建筑科学—结构工程]