厚层富水杂填土场地深层强夯和基坑支护降水  

The Down-Hole Dynamic Compaction and the Supporting and Dewatering of Deep Excavation in a Building Site with Thick and Saturated Miscellaneous Fill

作　　者：姜文富 侯芳[3] 付青 孙文来 JIANG Wenfu;HOU Fang;FU Qing;SUN Wenlai(China National Building Materials Group Shandong Building Material&Surveying Institute Co.,Ltd.,Jinan 250100;Shandong Branch of China National Geological Exploration Center of Building Materials Industry,Jinan 250100;Shuifa Testing Technology Group Co.Ltd.,Jinan 250100;Zhejiang Branch of China Geological Exploration Center of Building Materials Industry,Hangzhou 31o000)

机构地区：[1]中建材山东勘测设计研究院有限公司,济南250100 [2]中国建筑材料工业地质勘查中心山东总队,济南250100 [3]水发检测科技有限公司,济南250100 [4]中国建筑材料工业地质勘查中心浙江总队,杭州310000

出　　处：《土工基础》2024年第2期209-214,260,共7页Soil Engineering and Foundation

摘　　要：某厚层富水杂填土建筑场地位于济南市黄河冲积区,杂填土层最厚处达13.2 m,含有大量建筑垃圾碎块,局部看可见大块碎块和钢筋混凝土块。项目拟建五个3~7层建筑物和一个负1层地下车库,基坑开挖最大深度6.80 m。通过对场地的勘察、强夯、孔内深层强夯桩复合地基、降排水措施和基坑支护设计等方面的全面展示和分析研究,总结得出了最可行的孔内深层强夯桩的冲击成孔、管井的全护筒跟进旋挖钻孔等施工工艺和关键点,详细划分了强夯和基坑的范围,并深入探讨了管井降水系统应如何较好地配合强夯、孔内深层强夯和基坑开挖施工。以期为类似杂填土场地的建筑工程提供参考。This typical building site with saturated and thick miscellaneous fill is in a Yellow River alluvial plain in Jinan City.The site was a borrow pit for a brick kiln,which was abandoned many years ago.The maximum thickness of the miscellaneous fill is 13.2 m.This miscellaneous fll soil layer contains a large number of construction waste,some of which are large blocks and steel reinforced concrete blocks.The project includes five buildings varying 3-7 stories with one underground basement.The maximum depth of the foundation excavation is 6.80 m.This article shows the engineering investigation,the dynamic compaction,the down-hole dynamic compaction,the dewatering-draining methods and the design of the deep excavation supporting structure comprehensively.It is summarized that the impact method is the most feasible for the down-hole dynamic compaction.The full-length casing follow-up rotary excavation is the best construction technology for the installation of the dewatering point well,etc.The range of the dynamic compaction and foundation excavation are discussed in detail.The in-depth discussions also include of how the system of the dewatering point well coordinates with the dynamic compaction,the downhole dynamic compaction,the dewatering-draining methods as well as the deep excavation supporting structure.All of the above might provide some reference to the constructions with the similar miscellaneous fill sites.

关 键 词：富水杂填土 孔内深层强夯法 冲击成孔 降水管井 全护筒跟进旋挖 基坑支护 

分 类 号：TU472[建筑科学—结构工程]