JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2020, Vol. 37 ›› Issue (2): 147-152.DOI: 10.11988/ckyyb.20180978

• ROCK SOIL ENGINEERING • Previous Articles     Next Articles

Stability Analysis of Slurry Trench of Irregular Shaped Diaphragm Wall in Cohesive/Frictional Soils

ZHOU Yang1, LIU Wei1, SHI Pei-xin1, ZHU Ning2, HOU Guan-fei3   

  1. 1.School of Rail Transportation, Soochow University, Suzhou 215000, China;
    2.Suzhou Rail Transit Group, Suzhou 215000, China;
    3.China Railway 17th Bureau Group Co., Ltd., Taiyuan 030000, China
  • Received:2018-09-10 Online:2020-02-01 Published:2020-04-09

Abstract: The L-shaped diaphragm wall is broadly used to form an enclosed retaining structure underground. Due to the complicated stress condition during trenching construction, the stability of L-shaped trench is lower than that of regular rectangular trench. In this paper the instability mechanism of irregular-shaped diaphragm wall during the excavation of L-shaped slurry trench is revealed based on upper bound analysis. A 3D kinematically admissible mechanism defining the failure of the L-shaped trench is constructed. The safety factor of the trench and corresponding failure pattern are obtained through upper bound analysis. Moreover, the influences of trench geometries and soil properties on the trench stability are discussed through parameter analysis. The calculation result of a case study is consistent with the field ultrasonic inspection result.

Key words: L-shaped diaphragm wall, stability, trenching, upper bound analysis, safety factor

CLC Number: