The Optimization Research On Roadbed Style Of Road Passing Old Landslide

In recent years,many roads in plan have to pass through the old landslide due to heavy construction tasks combined with space constraints.Thus we need to consider the impact of landslide stability brought by road construction before we design it.It has important theoretical and practical value for understanding old landslide correctly and choosing the right roadbed style passing old landslide.Taking Chongqing Jialing Road Reconstruction Project Liziba area for example,literature retrieval method and finite element numerical simulation method combined with cost analysis are adopted to the optimization research on roadbed style passing old landslide.The main results are as follows:(1)Concerning Chongqing Jialing Road Reconstruction Project Liziba area Chongqing Meter Factory old landslide,proposed four basic types of roadbed forms passing old landslide,namely: embankment combined friction pile,cutting combined friction pile,long-span bridges and frame bridges;On the basis of 3 representative cross-section of the landslide stability checking,combined with the roadbed landslide by specific location,selecting 2-2?sectional using ANSYS finite element analysis software for the next four kinds of forms and roadbed landslide stability under unstructured simulated sexual conduct.(2)After we analysis of the results,found that the use of four basic types of roadbed forms passing old landslide did not affect the stability of the old landslide,on the contrary,to a certain extent,improves the stability of old landslide,and it is relatively obvious when using embankment combined friction pile passing old landslide for improving the stability of old landslide,mainly in the horizontal direction displacement on upper surface and the size and distribution of inside main stresses in landslide.(3)Referring to project cost related knowledge,we calculated the corresponding amount of engineering and construction costs for the four basic types of roadbed forms passing the old landslide,found that the form of frame bridges passing old landslide costs the lowest at rmb29692000 while the form of long-span bridges passing old landslide costs the highest at rmb39493600.Therefore,to ensure the stability of the landslide,maximize the use of low construction cost roadbed style passing the landslide,which means frame bridges crossing the old landslide is more economical and appropriate.(4)Combined with specific examples of projects and numerical simulation analysis,we studied the innovative use of small span frame bridge in mountain city road when crossing the landslide trailing edge,it has some kind of reference value for the optimization select of road embankment structure across old landslide.