The Study Of The Reasonable Rate About The Cutting Slope In Subtropical Rainy Region Of Yunna

In recent years, in order to enhance the transport efficiency of low-grade highways in Yunnan, the low-grade trunk roads transformed is the important task of the road industry in Yunnan. It rains intensively and earthquake occurs frequently in the Sub-tropical regions in of Yunnan Province, and the two factors seriously affect the stability of the cutting slope in the trunk highway upgrade. So how to account the economic and determine a reasonable slope ratio of the cutting slope in the stable coindition is the the outstanding technical issues that the Yunnan low grade trunk roads faces.This article relies on the highway expansion projecet of Si Mao to Jiangcheng road in the Sub-tropical regions,and research the reasonable slope rate of the cutting slope on the basis of summing up the results of previous studies.①It this paper analyse and mastered the failure characteristics of the cutting slope by through on-site surveys, and it classifies the cutting slope in accordance with the relevant standard. It also concluses the characteristics of the slope failure which shows the three situations: slope erosion, surface slip collapse and the overall instability.The cutting slope can be divided into stable slope,basically stable slope, less stable slope and unstable slope.②According to the survey results, it analyzes the characteristics of the cutting slope in different steady state.And it conclusions that the slope stability and the ratio shows a greater difference according to the different geotechnical compositong.i③It analyzes the stability of the slopes in different height which lie in normal conditions、rainfall conditions or seismic conditions by the way of limit equilibrium method, and come up with the reasonable excavation slope ratio combining with the engineering practice.It the results and conclusions of this paper plays a improtant part in the slope reinforcement and the protection of the highway expansion projecet of the Simao to Jiangcheng Road, and it also works to the similar areas of the road reconstruction as a reference.