【摘要】 基于真空预压理论和遮帘效应提出软弱土深基坑开挖新工法—真空帷幕止水与大气压力支护深基坑开挖工法。本工法将软弱土地基处理和基坑开挖及支护有效的结合在一起,具有垂直开挖、无内支撑、干作业、节省工期、节约造价等突出优点。新工法的理论基础是利用真空预压中真空区域土体所受的负压球应力作用和刚性结构对侧向土压力的遮帘作用,即由基坑侧壁所受的大气压力和基坑外侧刚性结构对土体的遮帘作用来代替传统的基坑内支护,同时,基坑外真空预压还起到降水和场区地基处理的作用。工程实例表明新工法的可行性和实用性,为深基坑工程技术的发展提供了新的设计理念与方向。更多还原

【Abstract】 A new method for excavation of soft soil deep foundation pit is introduced, that is the excavation method for deep foundation pit based on the vacuum water proof curtain and atmospheric pressure support. This method combines soft soil foundation treatment with excavation of foundation pit effectively, which has advantages such as vertical excavation, no inner support, dry operation, time-saving and cost-saving. The theoretical foundation of this technology is the negative pressure ball stress of vacuum preloading and the barrier function of rigid structure to the lateral earth pressure. In other words, the atmospheric pressure acting on the side wall of foundation pit and the barrier function of rigid structure to its lateral soils are used to replace the traditional support for foundation pit. At the same time, the vacuum preloading also has the effects of precipitation and ground foundation treatment. Engineering example shows the new construction method is feasibe and practical, and it provides a new design concept and direction for the development of pit engineering technology of deep foundation.更多还原