摘要
分析认为,基坑支护外侧的土体有可能产生侧向卸载和加载两种应力路径,因此进行了侧向卸载、加载的应力路径试验,并根据邓肯-张模型的思路和试验结果,推导了侧向卸载、加载的切线弹性模量公式。通过实例计算发现,用推导的切线弹性模量公式,可以得到很好的计算结果,这说明考虑侧向卸载、加载的应力路径的模量公式能够更好地模拟基坑问题。
Based on a preliminary analysis, it is estimated that the soil layer at outer of the retaining structure could produce lateral unloading and loading stress paths. Therefore, a series of tests were performed with different lateral unloading and loading stress paths. Based on Duncan-Chang model and result of experiments, formulas to calculate tangent elastic modulus were developed for lateral unloading and loading conditions. A good agreement was observed between test data and results from finite element analyses using the previously mentioned tangent modulus model. These results show that excavation of foundation pit can be better simulated on condition that lateral unloading and loading stress paths are considered.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第11期2421-2425,共5页
Rock and Soil Mechanics
基金
河海大学科技创新基金项目(No.2006407911)
关键词
侧向卸载
加载
应力路径
切线弹性模量
lateral unloading and loading
stress paths
tangent elastic modulus
