Research on factors influence of deep foundation structured by soil nailing based on grey system theory

摘要

Deep foundation pit was affected by several factors, and has become the focus of the geotechnical engineering. The deformation must be controlled rigorous according to the surrounding environment condition and safety level of the building. According to the Grey Incidence Analysis method of grey system theory, a new grey relationship theory model is applied in analyzing of the characteristics of deep foundation engineering supported with soil nail wall, to attain the relativity affected extent of the factors. After analysis of several practical engineering examples, to attain the most influencing factors of the displacement of deep foundation are soil-nail's interval, length, inclination, internal friction angle, cohesive strength and soil weight. The role of factors is classified in order to define the extent of the impact and provide guidance for construction design. After analyzing the data of the information of the field, utilized Grey Incidence Analysis method to make prediction about the deformation of underground structure and guaranteed the deep foundation pit safety. The security state of slope can be controlled effectively by predicting deformation using gray model. It shows that gray system theory can be effectively and practically adopted in the slope stability analysis of deep foundation excavation and that has a good prospect.