Trench is connected to very narrow and deep excavation filled with bentonite suspension. This paper presents estimation of its stability in cohesive soil. The stability is assessed by two calculation methods. The first involves the equilibrium of forces acting on the rigid wedge. The second one includes numerical calculations conducted in Plaxis 3D Foundations. A few examples having different dimensions (length and depth) are analyzed in uniform soil conditions. Graphs defining the dependence of length, depth and factor of safety are presented. It is found that for long trenches (L≥6m) the soil kinematics at failure coincides with the literature data. Short trenches are under a large influence of the arching effect and cohesive forces. The limit equilibrium method can be used under the condition of employing a factor, which reduces the value of the earth pressure.
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
Tel.: +1 703 830 6300
Fax: +1 703 830 2300 firstname.lastname@example.org
(Corporate matters and books only) IOS Press c/o Accucoms US, Inc.
For North America Sales and Customer Service
West Point Commons
Lansdale PA 19446
Tel.: +1 866 855 8967
Fax: +1 215 660 5042 email@example.com