土工基础

土工基础 ›› 2024, Vol. 38 ›› Issue (2): 209-214.

• 工程实录 • 上一篇    下一篇

厚层富水杂填土场地深层强夯和基坑支护降水

姜文富1，2，侯 芳3，付 青4，孙文来1，2   

  1. （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)
  • 收稿日期:2022-12-15 修回日期:2022-12-23 出版日期:2024-02-29 发布日期:2024-12-22
  • 作者简介:姜文富（1984-），男，高级工程师，研究方向为岩土工程。

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

JIANG Wenfu1，2, HOU Fang3, FU Qing4， SUN Wenlai1，2   

  1. (1.China National Building Materials Group Shandong Building Material & Surveying Institute Co., Ltd., Jinan 250100;
    2.Shandong Branch of China National Geological Exploration Center of Building Materials Industry, Jinan 250100;
    3.Shuifa Testing Technology Group Co. Ltd., Jinan 250100；
    4.Zhejiang Branch of China Geological Exploration Center of Building Materials Industry, Hangzhou  310000)
  • Received:2022-12-15 Revised:2022-12-23 Online:2024-02-29 Published:2024-12-22

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。

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

Abstract: 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 fill 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 down-hole 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.

Key words: Saturated Miscellaneous Fill, Down-Hole Dynamic Compaction, Impact holing Method, Dewatering Point Well, Full Casing Follow-up Rotary Excavation, Supporting Structure of Deep Excavation

中图分类号: