【正文】 of undisturbed soil strength. Reinforced earth structure from bottom to top filling layered construction, filling choice, density and intensity can be controlled。 set top of the hill, slope and the foot of the slope of the drainage system. Soilnailed lawenforcement: 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 highspeed soil surface layer and the soil in the spray created between 39。 erection of drilling soil nails, grouting, erection of connectors。 construction A soil nailing technology, concept and characteristics of 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 insitu soil the role of the three mon 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 pared, 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 topdown 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。Excavation of soil nailing Technical Analysis Abstract: The soil nailing technique is a new type of foundation pit forms in China in recent years has been widely used in foundation engineering, and achieved good economic and social benefits. In this paper, soil nailing technology, has done a brief analysis of the characteristics and discusses the construction of soil nailing and construction. Key words: soil nailing。 structure。 jet first layer of concrete。 banding steel , spray a second layer of concrete。embedded solideffect39。 reinforced pull the biggest changes in body pattern is different. In the reinforced earth structure, the general body at the bottom of the tendon force maximum. In the structure of soil nailing, the general range of the central part of the largest force of soil nail, the upper and bottom of the soil nail force small。 setting different densities. In the bolt support in the unit area on the retaining bolt set the number of generally less, for each root anchor construction accuracy and requirements are very stringent. In the soilnailing, the surface of soil nail retaining a little bit more dense arrangement of individual soil nail construction relatively low accuracy and quality requirements。 Cement: ordinary portland cement used, label , if necessary, sulfuric acid resistant cement, alumina cement should not be used. Cement should ply with the provisions of the existing cement standard requirements, there must be a single factory test reports, quality inspection orders, factory card documents, in accordance with its varieties, label, test numbers etc., and inspection and acceptance sampling inspection, by the examination results are reasonableUse. Bags of cement should be properly kept in storage and transportation, rain, moisture, stacked in a certain height from the ground heap shelves, is strictly prohibited and damage throwing throwing bags, prohibited the use of damp or different varieties of mixed cement label. Aggregate: stone and sand material (seeds film, mediumfine sand) should check report cards, the stone test methods and quality standard