Model Test And Mechanism Research Of Soil Nailing

Along with a great deal of high buildings set up lately and the city underground space of development, make the problem of the deep pit of foundation dig and protect rise to a very important position. The research for protect of deep pit of foundation involve the soil mechanics to flow the topic in the strength, stability and leakage of the typical model, also involving the problem of interaction of the protect structure, the soil body and close by buildings. The technique of protect deep pit of foundation is complicate, the influence factor is numerous, so the deep pit of foundation pays the research for protect is one of the point and a little bit difficult topics of the current rock soil engineering course.The method for protect to the pit of foundation is divided into: The passive protects method, active protects method and hybrid protects method. The soil-nailed and soil-anchored bracing is economy, fast and valid technique method in these methods. It is not only used for the temporary or permanent bracing for foundation pit of high buildings, but also used for the permanent bracing of dike side of railroad and the highway road. This kind of method has already produced the huge economic and social performances.This passage elaborated the development of the soil-nailed and soil-anchored. Totally induced work mechanism and basic principle, the work function and some basic designs calculation methods of the soil-nail and soil-anchor bracing. Also introduced some applied engineering examples of soil-nailed and soil-anchored bracing.For reflecting the work function of soil-nail and soil-anchor under different environment factor influence, author experiment through five indoors models to detect:1. Under various soil quality condition, the perfect arrangement of soil nails and soil anchor:2. Under the dissimilarly arrange way, the deliver and distribute regulation of shear the dint and curved that the soil-nail and soil-anchor be subjected to, and with the mechanism of the soil body interact function:3. Under the dissimilarly arrange way, the variety regulation of the field of displacement, strain and stress of the soil-nail and soil-anchor:4. Considering the influence of groundwater and the earth's surface water's permeates to the deformation of foundation pit, the time and space effect etc.