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珠海市的锦绣四季花园及横琴新区澳门大学排洪渠两个基坑,建设场地皆处于深厚淤泥的软弱地层之上,开挖深度5 m以下,在开挖过程中先后出现工程事故。通过对上面两事故实例进行分析,发现原因虽不尽相同但均为深层滑移破坏;并利用各自场地较宽裕条件,按业主要求及时提出针对性处置措施:锦绣四季花园基坑采取放坡及坡面加固方式进行处理,澳大排洪渠则在渠内抛石反压,对墙后淤泥用塑料排水板与分层堆载预压的方式对进行处理;分层堆载在监测变形可控情况下进行,采用本身仍需填至设计标高的新增填土,较好适应工期要求。按上述处理后成功稳定了失稳基坑边坡;事后总结出几点该类工程事故预防与措施方法,供同行在设计、施工参考。
Zhuhai Jinxiu Four Seasons Garden and Hongqinqu of Hong Kong University in Hengqin New District have two excavations and construction sites all above the weak silt with deep silt. Excavation depths below 5 m have resulted in engineering accidents in the excavation process. Through the analysis of the above two accident examples, it is found that although the causes are not the same, they are all deep slip damage; and make use of the more comfortable conditions of their own sites, put forward targeted disposal measures in time according to the owner’s requirements: Slope reinforcement method to deal with the Australian flood drainage ditches in the canal back pressure on the wall after the plastic sludge drainage dregs and stratified preloading method for processing; stratified stacking in the monitoring of deformation can be Under the control of the situation, the use of fill itself still need to fill the design elevation, better meet the requirements of the construction period. After the above-mentioned treatment, the stability of the unstable pit slope has been successfully stabilized; afterwards, several methods for preventing and treating such kind of engineering accidents are summarized for reference of counterparts in the design and construction.