APPLICATION OF FRAME STRUCTURE WITH PRE-STRESSED ANCHOR ROD FOR TREATMENT OF DEEP CUTTING SLOPE ENGINEERING

摘要

Frame structure with pre-stressed anchor rod is a new supporting structure for reinforcing slope. The distributing forms of stress state in rock-soil mass will occur to change after used of pre-stressed anchor rod. Additional stress and compressive deformation of rock-soil mass based on the elastic theory are hellaful to analyzing pre-stress losses and displacements of frame structure and slope surface. The internal force expressions of the frame structure were deduced according to deformation coordination analysis among the we-stress anchor rod, rock-soil mass and frame structure. By using of the analysis of the saturated-unsaturated seepage, Fredlund's strength theory of unsaturated soil and Bishop's method, the analysis of saturated-unsaturated slope stability provides the most dangerous sliding plane. The project example is about a deep cutting slope engineering of Luoding freeway at the 16th section of contracts at Dinxi area. The results of the lengths, diameters and distances of pre-stress anchor rod, the sectional dimensions and reinforcement of frame structure showed that the method of frame structure is credible and secure to treatment of the freeway slope,which could provide a theory method for the supporting structure design.