| Region of loess plateau of longdong in Gansu,the loess distribution area of about 120000 km~2.Which has been a problem of collapsibility of loess,the loess region of a typical engineering geological proble ms of loess collapsibility can cause a lot of problems,the process of engineering construction in common engineering problems such as uneven settlement of foundation,construction subsidence,roadbed subsidence and pavement cracking is caused by collapsib ility loess,the serious influence the development of the construction.In order to solve this problem,people will often choose soil and lime soil cushion layer,soil pile and lime soil pile and dynamic compaction method,the heavy hammer compaction metho d,pile foundation and ground treatment methods,such as the immersion method to prevent the foundation uneven settlement and deformation is too large.In qingyang region,mainly adopt the method of lime soil cushion or lime soil compaction process,but du e to the requirements of environmental protection,lime due to dust pollution by restrictions on the use of gradually,and with the development of social economy,more and more waste tires,handling of waste tires has become a big problem of the society.However,scrap tire has a strong heat resistance,resistance to mechanical characteristics.Therefore,this article will waste tires into use in the fly ash and lime two dust,will be reinforced its improvement,formed two dust,waste tires and its physical and mechanical properties were studied.The main research work is as follows:(1)Refer to a large number of literature,on the basis of analyzing the qingyang region facing the collapsibility of loess and the excess of waste tires two big problems,as well as the processing method of the two major problems at present stage and the insufficiency.According to the actual situation of qingyang district,summarizes the foundation soil reinforcement principle of fly ash and lime soil,puts forward the applications of waste tires to fly ash and lime in the two dust,will be reinforced its improvement,forming two dust,waste tires to improve collapsibility of loess?(2)In order to define the physical and mechanical parameters of soil,this paper at first analyzes the collapsible loess in longdong region climate condition,hydrogeological condition and regional tectonic and geological conditions,and the static sounding field test,standard penetration and collapsibility laboratory test including compaction test and experiment.Analyzes the cohesive force and internal friction Angle of changing with the depth changing with the moisture content,dry density,cone resistance and side resistance,foundation bearing capacity and compression modulus,moisture content,saturation,and collapsibility coefficient changing with the depth?(3)In order to understand the effect of collapsible loess of waste tyre two dust treatment,by and a real estate company to coordinate,a lime soil compaction in qingyang city xifeng district foundation made 7 root waste tyre particles in two lime soil compaction pile,studied the collapsibility two dust particles to eliminate waste tires,and primarily validate the results of laboratory experiments.The effect of the treatment of collapsibility loess and unprocessed and 3-7 soil compacting piles was compared and analyzed?(4)Refer to specification,found that the two dust particles treated waste tires collapsibility of the foundation meet the design requirements,therefore,two dust particles can waste tires in collapsible loess foundation treatment in the popularization and application.This not only solves the problem of solid waste and dust pollution in waste tires,but also provides new ideas and new methods for engineering practice in the loess area?... |
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