ABSTRACT
With the rapid development of society and increase of urban population intensive of the large and mediumsized city, in order to improve the utilization of urban land, construction develop to high-rise buildings and underground space day by day, all these things make the deep foundation pit become an important research direction[1]. Deep foundation pit is the foundation pit engineering whose excavated depth is more than 5 meters, when reach a particular deep excavation, only relying on the soil itself is difficult to ensure the deformation within the scope of the security, stability, therefore, all kinds of foundation pit support modes such as soil nails and anchor pile is generally used[2].The geological features of the different regions decide the degree of difficulty or ease of the support, so support process should be selected flexibly according to the specific soil and the depth of excavation of foundation pit[3]. The feature of temporary support of foundation pit want to be considered at the same time, so that avoid to cause the consumption of material and artificial[4].
