Study on the Design of Soil-Nailing in Loess Zone
|School||Lanzhou University of Technology|
|Keywords||Soil Nailing Lateral earth pressure Surface Nailhead Numerical Analysis|
With China's rapid economic development , infrastructure has become a major economic pillar of the national economy , the construction of the city , construction of roads and railways will be encountered slope excavation and backfill , in order to prevent the occurrence of landslides and debris flows bound to supports. Soil nailing technique is the most widely used in supporting projects of deep foundation and slope of urban architecture in recent years developed a support technology to overcome the traditional the supporting technical defects , has broad application prospects . At present, China is not deep enough soil nailing technique , generally chosen supporting structure in the form of a single old, generally on the project will lead to a greater waste and the use of unsafe . So we need permanent flexible retaining structure design study earthquakes and occasional role , and must be taken into account , but also consider issues such as durability . Based on the the loess region supporting structure design theory , research soil nailing design and build three-dimensional finite element model , a more comprehensive analysis of soil nailing structure , further reveal the whole process of excavation of soil nailing Internal Force and Deformation characteristics in an attempt to soil nailing a wider application of technology in the country to provide a more scientific basis . This study : (1) discussed the formation, development and research status of soil nailing technology , the characteristics of the soil nailing , type, range of applications , development and research status were introduced ; ( 2 ) analysis of the shortcomings of existing lateral earth pressure distribution model , introduced a new side of the earth pressure distribution model ; ( 3 ) to draw on existing literature on the basis of nailing surface layer and the nail head to be unearthed force checking formulas ; (4) for permanent soil nailing , introduced a number of measures designed to deformation control and durability ; ( 5 ) combined with a deep foundation pit soil nailing instances of structural engineering , finite element analysis software ADINA its overall three-dimensional finite element numerical simulation , considering the friction between the soil nails and soil , consider the element stiffness changes linearly between the real stiffness and zero unit of life and death process to make it more in line with the actual engineering analysis of the construction process pit displacement field and soil nail axial force of the change process and the maximum horizontal displacement of the surface layer and the nail head checking .