Viscoelastic analysis of heterogeneous frozen wall in deep alluvium

ZHONG Gui-rong; ZHOU Guo-qing; WANG Jian-zhou; SHANG Xiang-yu

Abstract：A new mechanical model of heterogeneous frozen wall was created which accords with freezing sinking with several circles of freezing pipes in deep alluvium. Based on viscoelastic theory and numerical integration method of Newton-Cotes, the stresses and displacement semi-analytical formulae of heterogeneous frozen wall were derived. Heterogeneous and homogeneous frozen wall were calculated. The checking calculation results show that the radial stress of heterogeneity and homogeneous forzen wall have the same distribution pattern, the absolute value of radial stress increases nonlinearly from inside to outside. The absolute value of circumferential stress of homogeneous forzen wall decreases nonlinearly from the inside to outside, but the circumferential stress of heterogeneous wall form two mutation points at the inner and external frozen pipe circle position. Both the heterogeneity frozen wall radial displacement and the homogeneous forzen wall radial displacement decrease nonlinearly from inside to outside. The radial creep displacement rate of frozen wall increases quickly during the early stage, and it gradually turns to be stable with the time. At the same position, the radial creep displacement of heterogeneous frozen wall is greater than homogeneous frozen wall at the same time.