Study On The Mechanism Of Slope Stability Of Heaping Mountain Engineering In Soft Soil Area And Engineering Countermeasures

In recent years,with the pace of urban construction is accelerating,the urban land is becoming increasingly tense situation,many domestic cities have carried out the heaping mountain project.The artificial heaping mountain making landscaping project not only beautifies the surrounding living environment,but also saves a lot of land resources.Meanwhile,it provides a way to use construction waste effectively.However,large area and high strength concentrated loading not only has higher requirements on the foundation strength,but also needs to verify the stability of the slope.In this paper,the stability of different slopes are analyzed according to a heaping mountain project of Tianjin City,analyzes the failure mode,and puts forward suggestions for modifying the section which does not meet the requirements of specifications.In addition,the action mechanism of the factors affecting the slope stability are analyzed,and the corresponding engineering countermeasures are put forward.The innovation and research results of this paper are as follows:(1)Firstly,the failure mode of artificial heaping mountain is studied.The results show that,in order to reduce the deformation and increase the bearing capacity of the foundation,it is generally necessary to reinforce the mountain foundation before the mountain is heaped,and the appropriate treatment at the same time will make the whole foundation stability is guaranteed,thus the mountain stability becomes the control factor.(2)The stability of the mountain itself is mainly related to the shear strength of the main material of the heaping mountain-construction waste,while the construction mainly controls the quality of the project by controlling the compaction degree of the material.In this paper,the mechanical properties of heaping mountain soil are measured through laboratory tests,and the relationship between the shear strength index and moisture content,compaction degree of the construction waste soil are discussed.Finally,the corresponding relationship between compaction degree and safety factor of slope is determined.(3)Different reinforcement methods have a great influence on the stability of the mountain.This paper compares the results of different analysis methods of slope stability,verifying the overall stability of the foundation of the heaping mountain project and calculating the slope stability of different sections under various treatment measures,the modification suggestions for the sections which don't meet the specification requirements are put forward,and determination the setting range of anti-slide pile.(4)The relationship between slope stability and slope shape,soil shear strength index and the setting range of anti-slide pile are discussed,and the construction method which is the most favorable to slope stability is proposed.(5)Laying geogrids in the mountain can improve its stability.This paper through the slope stability analysis software researches the influence of different factors such as laying mode,geogrid strength,quantity,location,spacing on the stability of the slope,and through the finite element analysis the effect of different geogrid position on the plastic zone,find out the most conducive to improve safety performance and economical geogrid laying method.