关键词: 等厚度水泥土搅拌墙, TRD工法, 小应变本构模型, 有限元

Abstract: Constant thickness cement-soil wall technique, namely trench crtting and re-mixing deep wall method(TRD) construction method, has been widely used in deep excavations in recent years. This paper presents a numerical analysis of a 0.7 m thick, 8 m wide, and 56.7 m deep trial wall panel constructed by the TRD method. The trail wall was constructed at the site of Shanghai International Financial Center Project. Based on the small strain constitutive model of soils, the computed results of lateral soil displacements and ground settlements are compared with monitoring results. It is observed that computed lateral soil displacements of 5 meters away from the wall agree fairly with monitoring data; while the one which is 1.4 meters away from the wall is a little smaller than the field data when the wall depth exceed 20 m. It can also found that the maximum ground settlements are near the wall and it decrease with the increase distance to the wall. Parametric analysis has been carried out to investigate the influence of wall depth on the lateral soil displacement and ground settlement. The results show that both of them are increased with wall depth.It can also be seen from the normalized curve of ground settlement that ,the maximum ground surface settlement induced by TRD method is approximately 0.05%H(H is the depth of wall panel)and the settlement influence distance is about 1.8H.

Key words: constant thickness cement-soil wall, trench cutting and re-mixing deep wall method(TRD) construction method, small strain constitutive model, finite elements