The 3D Stability Analysis Of Bank-slope Considering Structure-soil Effect

Wharf structures linked closely with the bank. It is difficult to analysis the stability of wharf as there are many affect factors. Using the method of single factor sensitivity analysis, it was analysed different factors on the stability of wharf. And then the safe coefficient of stability is fitted by the least square method. Considered the interaction of pile-soil, based on the finite element strength reduction and established three-dimensional model by the software of ABAQUS, it was calculated the stability of the wharf for 3# comprehensive berth of a port project in Chongqing. The main conclusions are as follows:(1) Through the change rate of different factors and the variation relation curves of safety coefficient, it can be concluded the order of bank-slope stability factors basing on the sensitivity, that is value ofφ〉value of C〉heaping load of the wharf surface。(2) Used least-square cubic polynomial fitting, it was deduced the expression of the safe coefficient of stability according to variable of internal friction angle( x₁ )and slope angle of( x₂): f(x₁,x₂)=0.22-0.01x₂+0.05x₂²+2.84e^-3x₁+1.84e^-4x₁²-1.45x₁x₂+7e^-4x₁x₂²-9.39e(-6)x₁²x₂+0.45x₁²x₂²(3) By finite element three-dimensional analysis, it was concluded that the piles can afford some part of the horizontal load in the shore-slope, part the plastic zone in shore-slope and make the plastic belt not easy to transfer.(4) The bank security coefficient of the wharfs declined to the rate of around 12% because of the lateral variations of water level.(5) Basing on the finite element analysis of the shear strength reduction for bank-slope stability problem, it can be comprehensively considered the pile, the water level change, bank slope rock mass characteristics, peak load and other factors. It also can be given the instability of plastic belt and slope surface displacement etc.