Analysis On Stability Of Soilnail Support Of Some Foundation Excavation In Beijing

With the development of economic, more and more high buildings emerge, so requirements which are on the support of building foundation excavation turn to be sticker. At the same time, there are more and more supporting forms. Soilnail is a type of supporting for building foundation excavation, which has many advantages, such as good stability, less cost and easy construction. For its advantages, soil nail spreads quickly and applies in many areas in our country. But compared to foreign countries, we have not given deep and systemic study on it. So it has realism meaning to give some research on soilnail supporting.The thesis applies theory in practice, and studies on calculation theory and construction methods. At first, it reviews the development of the supporting for building construction excavation, introduces several familiar supporting forms, sums up and compares their construct techniques as well as characteristics. From this, we achieve a clear understanding of soil nail and know it is a new and better supporting form as compared to others. Secondly, it makes a design for excavation supporting according to engineering examples, uses technical specification methods to calculate soil nail force in resisting pull, and changes some parameters, which make the design better. Thirdly, it uses Sweden strip method to find the most danger slippage face, and makes checking computation on its stability after supporting. Finally, it accounts the project cost based on the price level of Beijing, brings forward the construction blue print which thinks about space-time effect, improves the safety of excavation supporting, and makes the construction more convenient.