Application of Composite Soil Nailing Structure

At the present one of the important concerns in urban constructions includes the safety of adjacent buildings next to the excavation sites. Composite soil-nailing combined soil nails with other forms of supporting measures has avoided the soil-nailing technology from excessive dependence on the soil and expanded its application field. Among the different kinds of composite soil-nailing forms, the anchor composite soil-nailing support method is widely applied for its powerful location adaptability and easy construction. Soil nailing as a method of soil reinforcement in situ has been increasingly used to stabilize steep slopes in open deep excavations. There are several methods, based on the limit equilibrium approach, available for the analysis and design of nailed soil structures. A prestressed grouted ground anchor is a structural element installed in soil or rock that is used to transmit an applied tensile load into the ground. Grouted ground anchors, referenced simply as ground anchors, are installed in grout filled drill holes. The prestress was applied in prestressed anchor cables of composite soil nailing supporting structure.To a certain extent, the effect of stress releasing was offsetted for the slope of the soil excavated, the soil was compressed, shear strength of the soil improved, and the soil deformation was limitted effectively. The aim of the present study is paying attention to this new concept. In the present article, after a brief introduction for both methods of nailing and anchorage, and also some primary discussion on the combinatory method, then the results of our present analyses on the different types of combinations are presented and discussed. Horizontal displacement of composite soil nailing supporting structure with prestressed anchor cable was reduce, without apparent instantaneous excavation effect, it was more helpful to reduce deformation of foundation pit slop for closer to anchor cable.

کلیدواژه ها:

nailing method ، anchorage method ، the composit soil nailing method ، optimization