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随着我国城市交通压力的不断加大,越来越多的城市都开始修建地铁,以解决城市交通拥堵的问题。昆明作为我国主要的旅游城市,建立城市轨道交通体系是城市发展所必须的。该地区含有一层较厚的黑灰色的泥炭质土,这种土具有含水量高、孔隙比大、压缩性大、渗透性弱、抗剪强度低、灵敏度高等工程特性,有机质含量平均15%~50%,局部地方甚至达到60%以上。这些特性对于基坑工程的稳定性是十分不利的。本文以昆明轨道交通某深基坑作为研究对象,根据现场的实测数据分析了昆明地区特殊土质条件下基坑支护结构的变形规律,通过这些规律认识昆明地区深基坑工程的特点,为该地区以后的类似工程提供一些经验。
As the pressure of urban traffic in our country continues to increase, more and more cities are beginning to construct the subway to solve the problem of urban traffic congestion. Kunming, as one of the major tourist cities in China, is necessary for the development of cities because of the establishment of an urban rail transit system. The area contains a thick layer of dark gray peat soil, this soil has a high water content, porosity ratio, compressibility, permeability, low shear strength, high sensitivity and other engineering properties, the average organic content of 15% ~ 50%, even in some places more than 60%. These characteristics of the stability of the pit project is very unfavorable. In this paper, a deep foundation pit of Kunming rail transit is taken as the research object. Based on the measured data, the deformation laws of the foundation pit supporting structure under special soil conditions in Kunming area are analyzed. By these rules, the characteristics of the deep foundation pit project in Kunming area are analyzed. Similar projects in the area provide some experience.