基坑开挖对单桩及群桩回弹位移的影响分析     

卫凌云  秦胜伍  陈慧娥 《吉林大学学报(地球科学版)》2014,44(2):584-590

基坑开挖后坑底土体回弹,将会带动坑内基桩回弹,并在桩侧产生侧摩阻力。为了分析基坑开挖条件下单桩及群桩的受力变形特性,采用三维有限元方法对单桩及群桩在基坑开挖条件下的回弹位移进行了分析。分析结果表明,基桩在基坑开挖条件下的回弹位移分为桩侧土体回弹而引起的基桩回弹和下卧层回弹导致的基桩回弹两部分。由于群桩外侧桩的遮帘效应,中心桩的回弹位移小于外侧桩,中心桩桩侧摩阻力的发挥量也小于外侧桩。随下卧层相对刚度E_b/E_c变大,5×5群桩回弹位移相对减小量W_r变大,且W_r的变化与桩位置有关。3种不同构形群桩的对比分析结果表明:群桩桩数越多,遮帘效应越明显;W_r受桩数的影响大于受桩间距的影响。  相似文献   

Study of elastic-plastic damage model of cement consolidated soil with high organic content          下载免费PDF全文

CHEN Huie  WANG Qing  CAI Keyi 《世界地质(英文版)》2009,12(1):17-21

On the basis of elastic-plastic damage model of cement consolidated soil, the authors took organic contents into reasonable damage variable evolution equation in order to seek relation between the organic contents and parameters in the equation, and established the elastic-plastic damage model of cement consolidated soil considering organic contents. The results show that the parameters change correspondingly with difference of the organic contents. The higher the organic contents are, the less the valves of the parameters such as elastic modulus (E), material parameters (K, n) and damage evolution parameter (ε) become, but the larger strain damage threshold value (εd) of the sample is. Meanwhile, the calculation results obtained from established model are compared with the test data in the condition of common indoors test, which is testified with reliability.  相似文献   

Influence of stress conditions on shear behavior of slip zone soil in ring shear test: an experimental study and numerical simulation     

Chen  Huie  Ma  Wenliang  Yuan  Xiaoqing  Niu  Cencen  Shi  Bin  Tian  Guili 《Natural Hazards》2022,110(2):1179-1197

Natural Hazards - Hurricanes and tropical storms pose a significant threat to developed coastal regions around the world. In the United States, hurricanes cause billions of dollars in damage each...  相似文献