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The Research to the Long-Term Stability of the Yanziping Slope of Jiudianxia in Tao River

Author: HaoFei
Tutor: RenGuangMing
School: Chengdu University of Technology
Course: Geotechnical Engineering
Keywords: slope mechanism of forming the anti-analysis of the date creep factors stability numerical simulation
CLC: P642.22
Type: Master's thesis
Year: 2009
Downloads: 125
Quote: 1
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Abstract

The slope of Yanziping is in the range of the reservoir of the Jiudianxia hydroelectric power station in Tao river.for the needs of the engineering,it must be excavated in the front of the slope and in the place about 2240m height in the middle of the slope;the rear of the slope is the high and steep brae made up of super thick limestone,the durative apearing collapse which it bring will load the slope.The tectonic effect ,water effect by the faultage of F2 upside the slope and the rainfall all have infection to the stability of the slope.we can gained that the piles creep along the face of the bedrock from the date of the monitoring and analyse of the slope’s structure. In spite of these factors ,the long-term stability of the Yanziping slope will influence the safe of the highroad ,the building of Jiu company and the working order of the station,so it has large meaning to research the long-term stability of the slope .Basing the investigation, the date of the monitoring and the experimentation in the room;beginning from the geological and engineering conditions;after carefully analysing the structure ,the metamorphose of the slope and the date of the monitoring,it researchs the long-term stability and the creep characteristic of the slope:through the creep experimentation in room,getting the creep factors and long-term shear strength factors of the sliding belt soil,getting the creep factors too from the anti-analysis of the date of the monitoring.Then contrasting the displacement vs time curves from FLAC3D which uses the creep factors we have got with the displacement vs time from the date of the monitoring to validate whether the creep factors we have got is right,so it will make the foretell of the slope’s transfiguration more easily.In addition through the long-term shear strength factors of the sliding belt soil from the experimentation in the room, computing the stability of the slope in the condition of various water levels and getting the measure of the slope. Summarizing this article it can get these researching harvests(1) Ping landslide swallows belonging to the accumulation of large-scale landslides, collapse of the post-edge body limestone, sandstone and rock rubble page soil, slope sediments, landslides Alluvial front objects constitute slag heap construction.(2) The formation mechanism of the landslide: the mountain after the edge collapse on the landslide continued to load, rainfall, groundwater, reduce intensity and landslide slip surface anti-slide, and the artificial anti-slide on the foot of the slope above the excavation caused the decrease of anti-sliding force along the base to the accumulation of body creep of rock deformation.(3) Through the monitoring data analysis shows that: the decline over the past 20 years has been in a stage of creep deformation during the impact due to continuous rainfall and many mutations, the specific performance for the trailing edge surface fault rupture from the obvious through the cracks, the Ministry of sliding disintegration of the body surface signs of significant deformation, crack-intensive. Displacement monitoring changes in size over time, although susceptible to external factors and has fluctuated, but generally are uniform creep stage; displacement size from the monitoring points can be in the upper part of the larger displacement, the lower part of a small "over-type characteristics, atmospheric rainfall and its impact on humanity the most sensitive projects.(4) FLAC3D software through the establishment of three-dimensional geological model and the interior of the basis of rheological tests demonstrated that the use of back analysis of monitoring data can also be slippery with the correct soil creep parameters.(5) Through long-term strength parameters obtained under the condition of the water level decline of long-term stability coefficient, but also provide the basis for management of post-landslide.(6) Stability analysis based on the evaluation and forecasting, project management focus on stability augmentation site is: after the office building located in the slope of the B Zone and A District 1 profile control in the upper reaches of the landslide site. Take into account the topography of the site geological conditions, structural characteristics of slope, deformation of the evolution of trends, as well as treatment effect, it is recommended to take two parts at cut sides of retaining control of the project measures.

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