Practice of Slip Surface Depth of Highway Slope Determined by Synthetic Survey Method

摘要

The excavation roadbed was used in K29+450~900 sections of secondary highway from Gengma to Qingshui River. The design roadbed width was 12m, and after an excavation, the inclination of side slope was between 27 to 50 °. It is Nanting River below bed and the vertical distance is 20m between them. Under actions of external load, mountain slipping and river scouring, there appears an instable phenomenon in slope. The pile board wall had inclined which is located in the central section of one side of roadbed and close to K29+900 section after construction. The inclining range was larger and the inclination that was serious at pile head at the top reached about 2m. The research was focused on a side slope engineering in K29+450-900 sections and through site survey, the topography and geological features of slope were known and mastered. By drilling, high-density electric method and numerical simulation method, the depth and scope of slip surface were determined to provide a basis for governance programme of engineering reinforcement.