基坑支护外文文献 (2).doc

中文3700字 Soil nail wall, also known as soil nailing technology, which is installed in situ soil with a relatively dense soil nails, and soil slope surface of sprayed concrete to build a steel mesh surface layer, through the soil nails, the surface layer and in-situ soil the role of the three common slope or retaining wall side. Soil nail walls but also poses a similar gravity in situ reinforced earth retaining structures. And supporting a variety of methods have been compared, it has the construction easy, simple equipment, require little space, excavation and supporting jobs can be parallel, the overall progress of the fast, low cost, as well as pollution, low noise, stable and reliable, social and economic good, and many other advantages, and therefore at home and abroad with the foundation pit slope reinforcement has been widely applied rapidly. ????????Soil nail wall construction technology is a top-down step by step build process, according to the following order: According to design requirements for excavation face, trimmed slope, planted sprayed concrete thickness control signs; jet first layer of concrete; erection of drilling soil nails, grouting, erection of connectors; banding steel net, spray a second layer of concrete; set top of the hill, slope and the foot of the slope of the drainage system. ????????Soil-nailed law-enforcement: keep as much as possible, significantly higher maximum use of pit wall side of inherent mechanical strength of soil, changing soil structure and system load as part of the bracing. Sprayed concrete under the effect of high pressure gas flow, wherein high-speed soil surface layer and the soil in the spray created between embedded solid-effect, and gradually form a completely closed with the excavation shoring systems, spray layer and mounted with a protective layer of and reinforcement of topsoil, so that to avoid exposure to wind and rain erosion, shallow collapse, local spalling, as well as the role of impermeable impermeab