Research On Stabilizing Structure Of Slope Reinforcement

Landslide is a kind of widely distributed harmful disaster. With the further economic growth, many slope problems appear in the construction of hydroelectric, railway, highway and mine etc. in our country. Slope reinforcement becomes a hot and difficult topic in infrastructure construction of our country. The technique of anti-sliding pile and retaining wall is an effective measure in slope reinforcement, which has a wide application in the field. However studies on theory of these structure are delayed greatly than their applications. In this thesis, the design and calculation method of anti-sliding pile and retaining wall is studied based on landslide investigation on pishihang irrigation area ,which optimize engineering design and is convenient to engineering application. Major research work is summarized as follows:1. Based on sliding plane hypothesis of Coulumb earth pressure theory ,Coulumb accurate solution of active earth pressure to cohesive soil is improved which considers the cohesion force on sliding surface and the adhesive force on interface of retaining wall. Propose Coulumb accurate solution of active earth pressure on retaining wall with multiple layer of cohesive soil and with unsaturated expansive soil. Propose Coulumb numerical solution of passive earth pressure on retaining wall with cohesive soil.2. With consideration of groundwater and seepage flow influence, based on a new method considering water pressure and water weight of soil strip periphery, four kinds of commonly used calculation method of landslide thrust are improved using elementary properties of flow net.3. The calculation formulas of cantilever-pile and foundation coefficient method are derived to analyze internal forces of rigid anti-sliding piles. These formulas are shown in table so that they are applied. Based on elementary properties of foundation coefficient method, the counterforce load method is presented to calculate the internal forces of a elastic anti-sliding pile and the calculation program is designed.4. A elastic-plastic Finite element model with analyzing internal forces of anti-sliding pile is established. Internal forces of anti-sliding pile are calculated by FEM and traditional method and results of the two methods are analyzed.5. Making use of improvement Coulumb accurate solution, the overall stability reliability of gravity retaining wall and sensibility of the influential parameters related to the overall stability are analyzed.6. With consideration of the slope project classification and other influential factors, the calculation formulas for determining the anchorage depth of anti-sliding piles are rigorously derived using strength reduction , which are rational and convenient to engineering application. Making using of the methods , the reliability of the anchorage depth and sensibility of the influential parameters related to the anchorage depth are analyzed.7. Considering arch effect between adjacent anti-slide piles the rational model for pile spacing is established .Based on strength reduction, the calculation formulas for determining the anti-sliding pile spacing are proposed with consideration of the slope project classification and adhesive force between the side of piles and slope soil, etc. Making using of the methods the reliability of the pile spacing and sensibility of the influential parameters related to the pile spacing are analyzed.