Study On Stability Analysis And Treatment Scheme Of WK7 Tailings Pond In Yixian Yection Of Rongwu Expressway

Rong along the highway WK7 tailings reservoir by complex geological environment condition,its position of the surrounding rock fracture,the collapse body development,and the tailings itself loose deposit and more cluttered,the dam deposit in tailings and water content is larger,with gradually deepening of highway design,construction,the stability of tailings for the influence of highway construction and running of the increasingly significant,once the tailings dam or slump,will lead to immeasurable losses.Therefore,the stability analysis and later treatment of tailings pond is particularly important.There are many factors that affect the stability of tailings pond,many of which cannot be predicted at the current level of science and technology,and it is not easy to calculate quantitatively.At present,a complete set of evaluation system and treatment scheme has not been formed.How to determine the effective treatment scheme is not only of great significance to this project,but also of guiding and constructive significance to the determination of the design and construction scheme of similar projects crossing or adjacent to tailings pond in the future.This thesis takes the highway yihsien rong period to eliminate WK7 tailings influence to highway management plan "project,designed to study the stability of the tailings and the influence on the highway,and according to the results of stability analysis,at the same time,adjust measures to local conditions,in line with safe and reliable,the technology is feasible,economic and reasonable principle of the control measures of the tailings.First,according to the research results at home and abroad combined with the actual situation of the project and the existing engineering examples,referring to the existing relatively mature stability analysis and evaluation method of tailings pond,the calculation model and the calculation condition are determined.Secondly,the generalized stratified map of engineering geology of tailings pond,engineering geological data around tailings pond,hydrogeological data and design data of expressway passing through tailings pond area are collected,including reinforcement parameters of abutment and pier,etc..According to the geological generalization and stratification of tailings reservoir area and surrounding areas,the appropriate calculation parameters and models are selected.MIDAS software is used to analyze the seepage stability,anti-slip stability and dynamic stability of the tailings pond.Numerical analysis of seepage stability of the dam body is carried out by using the finite element method under the condition of normal operation and flood operation.Dam stability against sliding of numerical analysis proposed according to the normal operation condition,the flood operation condition,special operating condition in three different conditions using recommended "limit equilibrium method" to the quality standard of status quo of the anti-sliding stability of the dam body under the condition of the static calculation and analysis on the stability of dam body seepage and stability against sliding of the minimum safety factor are given respectively different working conditions.The dynamic stability analysis of the dam body is intended to carry out nonlinear static analysis of the tailings pond before the earthquake,dynamic response of the dam body of the tailings pond during the earthquake,residual deformation of the tailings pond after the earthquake,liquefaction and stability of the tailings pond after the earthquake.Through the risk analysis of tailings pond dam break to determine the expressway should take protective measures.According to the most unfavorable situation,determine the tailings pond dam break process on the highway.In the risk analysis of dam break,the flood overtopping condition is adopted to calculate the impact and influence of tailings pond on the line after dam break.By using finite element software MIDAS to conduct numerical simulation analysis on the process of dam break of tailings pond,the influence of debris flow formed in the process of dam break on bridge piers can be analyzed more accurately,and the possible adverse impact of tailings pond on expressway can be displayed as soon as possible,so as to take corresponding prevention and control measures.Through analysis and judgment,the treatment plan of tailings pond is determined.