Trench stability analysis

Jiin-Song Tsai, Jia Chyi Chang

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A three-dimensional limit equilibrium analytical method for the stability analysis of slurry-filled diaphragm-wall-trench in sand is presented. A critical shell-shaped slip surface for the soil mass flanking the trench is chosen according to the minor soil arch principle. Arching effect is considered for determining both the slip surface and soil pressure. Base on force equilibrium, the safety factor is computed by iteration for the agreement of two ratios, including the ratio of the slurry pressure to the required lateral pressure and the ratio of the internal frictional angle of soil to the mobilized frictional angle. Parametric studies on trench length, internal frictional angle of soil, ground water level and slurry level were performed. Analytical results indicate that shallow depth within three meters below grade is the most critical part. It is observed that the hydrostatic pressure of slurry is the most important factor to the trench stability.

Original languageEnglish
Title of host publicationProceedings of the International Offshore and Polar Engineering Conference
Number of pages8
Publication statusPublished - 1996
EventProceedings of the 1996 6th International Offshore and Polar Engineering Conference. Part 1 (of 4) - Los Angeles, CA, USA
Duration: 1996 May 261996 May 31


OtherProceedings of the 1996 6th International Offshore and Polar Engineering Conference. Part 1 (of 4)
CityLos Angeles, CA, USA

All Science Journal Classification (ASJC) codes

  • Ocean Engineering


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