摘要
为了将人工冻结技术应用于大型深基坑支护工程中,利用自行设计加工的大型深基坑冻结模拟试验台,进行了大直径圆形冻土帷幕受力与变形的物理模拟试验,获得了深基坑开挖过程中圆形冻土帷幕水平位移随基坑开挖深度、开挖半径、冻土平均温度等影响因素的变化规律.结果表明:冻土帷幕水平位移随基坑开挖深度和开挖半径的增大而增大,随冻土的平均温度降低而减小;冻土帷幕最大水平位移位置均出现在开挖面以下,一般出现在帷幕全深的0.7-0.8倍深度范围内;冻土帷幕水平变形的主要影响因素是基坑半径和开挖深度.
In order to apply the artificial freezing technology to the deep foundation pit, a physical model test of the stress and deformation of large diameter circular frozen wall were carried out on a self designed large test rig. The changing laws were obtained between the horizontal displacement of the wall and factors of the excavation depth, wall diameter and the average of temperature of frozen soil. The results show that the wall horizontal displacement increases with the increasing of the excavating depth and diameter, but decreases with the decreasing of the temperature. The maximum horizontal displacement occurs below the excavated surface with the depth of 0.7-0.8 times of the pit depth. The diameter and depth of a pit are the major factors that affect horizontal displacement of the frozen wall.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2007年第2期137-141,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金重点项目(50534040)
关键词
深基坑
冻土帷幕
变形性能
试验研究
deep foundation pit
frozen wall
deformation feature
experimental research
