Study On Stability Of The Houzi-Slope In The Right Atomization Slope Of Jinping Ⅰ Hydro Power Station

In railway, highway, water conservancy and hydropower, mining and other basic construction engineering fields, there are lots of high, steep and rocky slope. Instability of high steep slopes caused heavy casualties of ongoing event. It is important to ensure these high slopes stable during in construction and operation that can make sure these basic construction projects carry out smoothly and give full play.Based on the project (Jinping I hydro power station during right slope determining dynamic stability and monitoring feedback analysis),the paper analyzed the stability of Houzi-Slope in the right atomization slope.(1) Based on field geological data for hydropower station, many geological data are collected and analyzed at the right atomization area of Houzi-Slope. Trough the analysis of the complex geological structures such as fault, interlayer compressive belt, unloading cranny in the region which the slope locals in, combined with the potential failure mode, the slider combination is determined that may lead to whole and local instability on the slope.(2) According to the hydropower spray in the Houzi-Slope, a typical profiles is analyzed about the seepage, and the effect that caused by atomized rain on the stability of the slope is also analyzed. The analysis results show that the atomized rain has a great influence on the slope. The infiltration of the atomized rain and slope drainage should be paid attention to.(3)In terms of the overall, local potential instability mode, all blocks which may be unstable are searched and their failure modes are analyzed. According to four conditions (self-reverence, atomized rain, earthquake, atomized rain+earthquake), safety coefficients of the slope are calculated by rigid body limit equilibrium method and the conclusion of slope stability is drawled. The calculation results show that the slope may be unstable when there is no supporting existing. Some support measures that the slope needs are put forward.(4) The 3d elastic-plastic numerical analysis on the Houz-Slope is carried out, considering the stress-strain field analysis respectively in natural state, the atomization state after flood, the atomization state after supporting. Analysis results show that the slope may be unstable in the atomization state after flood when there are no supports. The displacement of the slope is controlled effectively and the stress state also is improved while the slope can maintain overall stability after the prestressed anchor cables being used. (5)Based on the above analysis results, we take some measures to reinforce the slope according to the current domestic common rocky slope reinforcement measures.