Slope Mountain Reservoir Bank Collapse Prediction Of Soil

Recent years, with large-scale development and utilization of water resources, the size of the reservoir within the country also will be built and put into operation. Currently, only the Yangtze River Basin has built a large reservoir reached 113, with a total storage capacity of 104.8 billion m3.After impoundment, due to changes in the hydrogeological conditions of the reservoir area will inevitably cause some engineering geological problems. In these engineering geological problems and especially the reservoir bank collapse in the most obvious. Reservoir Bank refers to the original slope after impoundment Reservoir water soak in the library, libraries, water transfers, alternating wet and dry, water erosion, storms(row boat waves) under the influence of shock, leading to its physical and mechanical properties of rock and soil variations poor, increasing the rate of rock weathering- erosion erosion, collapse, slippage re deformed so that the library is continuously receding shoreline bad geological phenomenon. Reservoir Bank Collapse developed to a certain extent give socio-economic development and people's lives and property safety of the reservoir area to bring greater harm.Currently collapse prediction fruitful research on existing and construction methods can be summed up in two categories, one for the engineering geological analogy, the other for the search limit equilibrium method. Engineering geological analogy method is based on analysis of reservoir bank collapse in the investigation on the basis of which the representatives of the forecasting methods Zuoluo Ta Liao Fu prediction method, the manual method(three-stage method), Sec law and River Bank Structure Method. Conditions of use of these methods Jie restrictions, which apply to our Western Mountain Gorge Reservoir Bank forecasts are still some deficiencies: the bank collapse in China's western region of coarse particles land less than forecast actual width width. the more fine-grained soil particle size, uniformity as possible, the forecast is relatively accurate, the greater the soil particle size, the greater the uniformity of the worse the prediction error.In this paper, for example Longkaikou reservoir collapse prediction, choose three typical sections as a long-term monitoring section. According to the geological conditions of topography, structure Reservoir, covering the use of soil particles and other similar geometry, material composition similar dynamic is similar movement similar to the external conditions(rain, waves, etc.) similar to the principles of the use of orthogonal experimental design methods 9 times multivariate experiment and 13 groups of single factor experiments.Finishing Multivariate analysis results, the sensitivity analysis of the impact of various factors on the bank collapse in the use range method. Changes in slope angle slope get the biggest impact on bank collapse in width, followed by material composition changes slightly larger than the waves change, the impact of changes in the water level of the minimum.The single factor test results obtained under the same conditions, convex slope biggest bank collapse width, followed by straight slope and concave slope, stepped sloping bank collapse in the minimum width and a series of conclusions.According Longkaikou reservoir bank collapse in the feature, select West Sancha Lake Reservoir(Sichuan), Gong Tsui reservoir(Sichuan), Baiyun reservoir(Hunan), Granville Creek Reservoir(Hunan) investigated the bank collapse in its characteristics, combined with physical simulation test soil banks get hilly reservoir bank collapse in a series of laws.For example, mountain reservoir bank collapse lasts for a long time, most of the reservoir in reservoir bank after 40 years in a stable or relatively stable state. Bank collapse pattern mainly to collapse and erosion abrasion, collapse collapse can be divided into back again and wave type, flushing, etc.Classical graphic method, including Zuoluo Ta Korolyov, analogy graphical method, two-stage process, BANK structure analysis method applicability? Choose more appropriate Western Mountain Reservoir Bank Collapse Prediction graphic method- "three-stage method, " a revision in its collapse prediction parameters? The main amendments include: Bank Collapse in the analysis features, genetic mechanism, on the basis of factors, from which the three points and a slope correction? Its collapse prediction parameters before the water year round low water level as a starting point for the annual flood level correction; the design of low water levels and high water level design as the starting and ending point with a fluctuating water level in the reservoir is corrected to the long-running low-level and high-level long-term operation; the bulk of underwater slope angle as the underwater stable slope angle correction for underwater soil under hydrostatic conditions stable slope angle ? According to the authors investigated parameters Collapse Prediction Collapse Prediction binding parameters previous scholars, the proposed reservoir bank collapse prediction parameters constitute common mountain soil coarse particles.According to section Longkaikou site monitoring data, the use of cross-sectional collapse prediction correction "three-stage method" and Reservoir Structure Method. Results are as follows:(1) The amended "three stage process' collapse prediction can be better used Tankeng Dam library.(2) The amended "three stage process' is too large relative to the reservoir bank structure method, mainly due to the amendments "three-stage process" starting point for the original forecast annual river flood level, after taking into account the dead water level below the water slope collapse, predicted start reservoir construction method is dead after water storage, water level did not involve dead soil collapse situation, leading to predictions too small. According to group a large number of reservoirs field investigation that the dead water level slope after impoundment damage will occur more realistic.(3) After the dead water level slope water does not destroy or damage a small slope, consistent correction "three-stage method" and Reservoir structure prediction methods, such as a-a 'cross-section.(4) According to the site investigation stage monitoring BANK COLLAPSE sectional width smaller, generally a few meters to ten meters, mainly Tankeng impoundment short time, is in the early evolution of the reservoir bank reconstruction, so the actual value of Bank Collapse the relative predictive value smaller?...