Analysis Of Soil-Nail Based On Gray System Theory

Based on finite-difference theory and calculation procedure of FLAC, numerical simulation in reinforcement for deep foundation pit with soil nailing is carried out. When the deep foundation pit with soil nailing is excavated, the supporting mechanics of soil nailing is analyzed. At the same time, the influence of the soil nail's parameters and soil indicators is analyzed. And the change of the soil nail's internal force is analyzed.The scheme of numerical simulation is designed with the theory of uniform design. After the scheme is carried out, we can get much testing data. Then the data is analyzed with the Grey System Theory, we can get the relevant parameter of the soil nail's parameters and the displacement of deep foundation. Then the influence to the displacement of deep foundation is analyzed. The relevant parameter of the soil nail's parameters and the most stress is accounted. Then the influence to the stress concentration is analyzed. We can obviously reduce the change of the deep foundation's form and the stress concentration when we consider the marked ingredient firstly. Relating to grey relation analysis, the GM(0,N) of soil nail system is given.In this thesis some research results on the soil-nail have been obtained. The influence of designed parameters of soil-nail and the soil indicator is different evidently. 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 most influencing factors of the stress concentration are soil-nail's length, interval, inclination, soil weight, cohesive strength and internal friction angle. Via the study in this paper, the grey system analysis methods are applied to the study of soil nail system, a little field survey data is handled, and so the one another relations between the change of the deep foundation's form and factors affecting deep foundation stability. All above jobs can provide the helpful information for the practical project, and supply the warrant about the reasonable precautions in the progress of the soil nail engineering design.