Application of Soil Nail Retaining Structure in Stability Analysis of Subway Foundation Pit Slope
A foundation pit of Wuhan Metro Line 12 adopts the construction method of slope excavation.In view of the safety problems of slope soil mass self-stability reduction and landslide and collapse risk after foundation pit excavation,according to the mechanical balance and numerical simulation theory,the plane sliding method and Swedish arc method are used to calculate the safety factor of slope under natural conditions and soil nail retaining conditions respectively.The midas GTS NX numerical simulation was used to ana-lyze the slope displacement changes under natural and soil nailing conditions,and the supporting parameters such as rod diameter and shotcrete thickness were optimized.The results show that the safety factor of the slope is increased to 1.39 by using the soil nail retai-ning structure with the diameter of the rod body is 22 mm and the thickness of the slope concrete injection is 150 mm,the safety factor of the slope is increased to 1.39,which is greater than 0.495 under the natural condition.The vertical displacement of the slope is con-trolled at 1.8 mm,which is less than the natural condition of 5.7 mm,indicating that the soil nail retaining structure improves the sta-bility of the slope and increases the anti-sliding force of the soil sliding surface.
slope stabilitysoil nail supportmechanical equilibriumnumerical simulation
NETL
NSTL
万方数据
维普
