Effect Of Deformation Of Soil Nailing Wall On The Surrounding Environment

This paper takes Kunming City Pan Xing Bo Da foundation pit in the soil nailing wall section as the research object,soil is established by Midas/GTS finite element software,the three-dimensional finite element model of interaction between supporting structure and surrounding environment of soil nailing wall.Based on the analysis of soil nail length,inclination,layout,density and influence soft soil in foundation pit in the position of the soil nail wall deformation and surrounding environment,finally on the bottom for soft soil,increase soil nail length and different prestress of prestressed anchor soil nail under the improvement of support deformation of soil nailing wall and the surrounding environment.The main work and research results are as follows:(1)On the basis of engineering examples of soil nailing wall model is built by Midas/GTS finite element software,the construction process simulation of soil nailing wall.It shows that the simulation results verified the model and monitoring value through the simulation results,the soil nailing wall and the surrounding environment,the results of deformation analysis.(2)Soil nailing inclination from 10 degrees to 30 degrees interval,the smaller the angle the more favorable for deformation control;increase of 4m in the original supporting structure of the nail length,the average length of soil nail is 1.15 times the depth of excavation,reached a critical length,if we increase the length of the internal force of soil nailing is almost no nail change,to control the deformation of little significance;the total length of soil nail and soil in the same well,the length of phase arrangement on the deformation control of the most favorable time,longer in the middle,causing deformation is the biggest short arrangement on long;considering the requirements and economical deformation control,soil nailing the distance is about 1.5m when the best nail spacing is 0.5m,the effect of group nails,nail density is too high and the deformation control is very unfavorable.(3)The thickness of soft soil 2m in the pit in the position on the deformation control under the more adverse,the physical and mechanical parameters of soft soil by using typical peat soil parameters in Kunming area.When the soft soil is located in the bottom of the pit,no deformation effect simply by increasing the length of soil nailing to control the effects of soil nailing wall the prestressed anchor composite soil nailing wall soil nailing support.In a certain range with the prestress value of prestress increases,the deformation control has a positive meaning,when the large prestressed anchor,will increase the upper soil deformation,unfavorable for deformation control.