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粉细砂层在高层建筑基坑开挖中岩土工程问题探讨:结合南京地区工程实例分析

郑庆怀 闫长虹 何长鸣   

  1. 南京大学地球科学系
  • 收稿日期:1998-03-20 修回日期:1998-03-20 出版日期:1998-03-20 发布日期:1998-03-20

GEOTECHNICAL PROBLEM IN FOUNDATION PIT EXCAVATION OF SKYSCRAPER IN THE FINE SILT BED OF NANJING DISTRICT

Zheng Qing-huai, Yon Chang-hong, He Chang-ming   

  1. Department of Earth Sciences, Nanjing University, Nanjing, 210093
  • Received:1998-03-20 Revised:1998-03-20 Online:1998-03-20 Published:1998-03-20

摘要: 本文从土体结构、力学性质、水文地质条件和由工程活动所引起的地质环境变化等方面,分析了古河道区二元结构地层的粉细砂层深基坑开挖中易出现的岩土工程问题,如:地面下沉、流土、管涌、基坑边坡失稳和坑底隆起等,提出了设置合理降水、止水、回灌系统、构筑挡土止水设备、加强施工地质与检测工作等防治与解决问题的对策,并在南京某工程深基坑开挖中险情分析和处理措施中得以实践且收到较好的效果。

Abstract: The ancient stream channel of Qinhuai river is characterized by its binary structure of sand and clay,and is also art important aquifer.Based on the analysis of its particular engineering geology, hydrogeology and surrounding conditions, this paper discussed the geotechnical problem in the foundation pit excavation of skyscrapers and its settlement, which can be used in the design and construction of deep foundation in this areas.