摘要
基坑围护结构上实测的内力常常远比用经典土力学理论计算的数值小,基坑内侧被动土压力的计算值偏小是造成该情况的原因之一。根据基坑开挖工况,认为开挖后土体有效上覆压力是从原地面算起的自重应力与开挖卸载引起的“负附加应力”的叠加,并采用超固结强度指标计算坑内侧被动土压力。
The measured internal force in bracing of foundation pit is always larger than that calculated with the classical earth pressure theory. One of the important reasons is the decrease of the amount of passive earth pressures inside pits. Based on the excavation, a new method to calculate the effective vertical stress of excavated soils was proposed. The after-excavated vertical stress was the same as the self weight of soils before excavation added the minus stress superimposed stress caused by excavation, at the same time, the over-consolidation strength index was used to calculate passive earth pressure.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2006年第B11期1493-1496,共4页
Chinese Journal of Geotechnical Engineering
关键词
基坑围护结构
被动土压力
有效上覆压力
超固结
bracing of foundation pit
passive earth pressure
effective vertical pressure
over-consolidation
