Research On The Stability Of The High Embankment Slope Of Wu Xian Miao Deep Valley At Bazhong Airport

To promote the economic development of Bazhong, to be in Bazhong grace Yang area construction of Bazhong airport. Bazhong is a hilly area, Building airports will inevitably involve high fill problem. The southwest and central distribution in the Bazhong airport has many deep valley, high fill in this area,The stability of high filling must be taken seriously. This paper takes study on the high embankment stability of Wu Xian Miao deep valley in southwest end of Bazhong airport and stability of different filling scheme.This paper found out the engineering geological conditions of the research firstly by means of engineering geological mapping, drilling, field survey and indoor test. Analysis of the main factors that influence the stability of Wu Xian Miao gully region under different filling scheme, that is, the degree of compaction of embankment slope, and filling the body with high and steep slope of the original ground treatment. On the basis of the theory of limit equilibrium and numerical simulation method, at the same time, in order to reduce the scope of the land acquisition, reduce the amount of engineering, save costs. Study on the preliminary design of embankment slope stability, filling scheme under the filling scheme of slope ratio were discussed and optimized. Research results show:(1) In accordance with the filling of the preliminary design scheme, consider formed after the 90% degree of compaction filling high embankment slope is unstable state. With the increase of the degree of compaction of the embankment, stability gradually strengthened. When the compaction degree is 92%, the high embankment slope is in an unstable state in heavy rain conditions. When the compaction degree is 94%, the high embankment slope is in a stable state, but the safety reserve is lower. When the compaction degree is up to 96%, the high embankment slope is stable, relatively high safety reserves.(2) 96% degree of compaction as a benchmark, to explore the control effect on the filling ratio of slope embankment slope stability calculated by limit equilibrium method, and the slope rate is optimized. When the slope rate of 1:1.75 is filled, the slope is in a stable state. When the slope rate of 1:1.5 is filled, the slope is unstable under various conditions. At the same time, based on the potential sliding surface search, found out that the potential sliding surface is along the embankment and rock contact surface slip.(3) In order to ensure the stability of the contact surface of the filling body and bedrock. The effect of the excavation of the contact surface on the anti slide steps is discussed with the 1:1.5 slope ratio. By comparing before and after internal step excavation effect on stability and fill the change of stress and strain, deem that After the step excavation,the high embankment is in a stable state. The stress concentration and plastic damage zone of the contact surface of the filling body and the bedrock are obviously improved. According to the excavation step proposed to ensure the stability of the high embankment is feasible.