| According to the national "13th Five-Year" planning,urban construction land demand will greatly increase.During the construction of mountain towns,due to the special environmental landforms,high filling and deep digging will often occur,which is easy to cause debris flow and other geological disasters.Thet seriously affect people’s lives and property safety.Therefore,it is of great significance to study the stability evaluation of urban construction site and comprehensive site remediation technology.This paper is based on the national science and technology support project of Ministry of science and Technology(2012BAJ22806-04),which is based on ecological security assessment of rural area development and construction.Combine with Yuan Chiling land Chengkou county of Chongqing city land reclamation,three dimensional stability analysis and comprehensive control techniques of site slope have been developed.The main contents of this paper are as follows:This paper firstly analyzes the engineering geological conditions of Chengkou high fill ground and summarizes the features of the engineering site,topography,geology,hydrology and surrounding environment.According to the characteristics of the high embankment slope of Chengkou space complex shape,a simplified calculation model of V trough section was established.This paper analyzes factors affecting the stability of fill slope and a three-dimensional limit equilibrium method for asymmetric slopes of V valley fill sites is proposed.The analytical method is verified by the calculation example of a semi elliptical asymmetrical sliding body.Through the survey plan of Chengkou high filling engineering,the elevation point coordinate information is extracted.This paper established a three-dimensional calculation model of Chengkou embankment slope by the program of Midas GTS NX.The bar column is divided,and the 3D coordinate information of the corner point of the column is extracted.According to the formula of three-dimensional limit equilibrium for asymmetric slopes proposed in this paper,the matlab program is compiled.The angle coordinate value of the bar column obtained by reading.Then,this paper calculates the stability of Chengkou fill site,local stability coefficient,slip direction and overall stability coefficient of the fill site are obtained.This paper calculates the overall stability of the embankment slope of Chengkou by two dimensional unbalanced thrust transfer method and strength reduction method.The calculation results are compared with the method presented in this paper.The feasibility of the method is analyzed by the results of three kinds of stability analysis methods,and this paper discusses the difference between calculation and 3D stability calculation of two-dimensional stability of embankment slope of Chengkou.The comparative analysis shows that the two-dimensional stability analysis is more secure than the three-dimensional analysis method.This paper discusses various factors that should be taken into consideration in site planning and design,analyzes the Chengkou fill site of the natural and human conditions and a preliminary fill grading scheme considering various factors of site planning and design is designed.Combined with the three-dimensional stability analysis results of filling site,a comprehensive control technique based on multi factor analysis of town site planning is proposed.At last,this paper puts forward a comprehensive treatment of Chengkou embankment slope which contains engineering and ecological measuresIn summary,this paper established the V model of valley city,proposed an improved three-dimensional limit equilibrium method for asymmetric slopes and carried on the overall analysis on the stability of high embankment slope of Chengkou.Combined with stability evaluation and multi factor analysis method for site planning,a comprehensive control technique based on multi factor analysis of town site planning is put forward.The research results have certain reference value for the high fill site regulation project. |
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