| By rapid development of economy and increasing of traffic volume, the original low grade road needs to be widened, the existed way of widening mountain road, such as excavating slop, filling soil, masonry and cable retaining wall, may either cost a lot or do bad to the environment.Under the conditions of precipitous slope, a new structure of widening mountain road with integral cantilever (ICS) is suggested. On the premise of doing no harm to original environment, the design principle is to widen the road with cantilever structure, making full use of exiting stable roadbed, which can be carried out easily,cheaply, and protect the ecology.Taking k1274+855~895 of 214 State Road as experimental project,the calculation model is proposed for analyzing the interaction between ICS and rock-soil which based on appropriate assumptions, and synthesized stiffness matrix of the column, the anchor rod and the ground after the stress mechanism of ICS is analyzed,the interaction between the ICS and the rock-soil is carried on the finite-element analysis by using variable bedding value and the foundation flexibility matrix to obtain the interaction equation in this paper.To simplify the calculation, simplified calculation model is proposed for analyzing the interaction between ICS and rock-soil, and the force method equation is derived for the calculation of the plane structure and the spatial structure,the solution of anchor end under different geological conditions is discussed, the stability of ICS is also analyzed.Using ANSYS, the finite element model is established to reflect actual situation, the coordinated working performance of ICS under a variety of ground conditions is analyzed,such as dense old-filling soil,gravel soil,rock,local soft ground.the calculations indicated that the calculation method proposed in this article is able to react the interaction performance better between ICS and rock-soil, and verified that the simplified calculation model used to design ICS is prone to safety.
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