![]() Many of the formulas obtained are preliminary and not comprehensive. Previous studies on the deformation of the foundation pit mainly focus on the estimation of the maximum deformation, but the dynamic description of the deformation process is relatively deficient. ![]() (2) The understanding of the ground deformation law and mechanism caused by deep foundation pit excavation is not clear enough, and it is difficult to achieve refined design and construction. Because of the characteristics of the deep foundation pit and the diversity of geological conditions, the guidance function of the system theory is less than that of other technical fields, so that the design of the deep foundation pit is too conservative under some conditions and causes waste, while in other cases, there are greater safety risks to the construction and safe use of the deep foundation pit. At present, the experience based engineering analogy method is widely used in deep foundation pit design in our country. As far as the research and engineering practice at home and abroad are concerned, there are four problems in this field: (1) The design of the deep foundation pit based on deformation control lacks reliable theoretical guidance, and it is difficult to achieve the scientific design. ![]() The research of the deep foundation pit design based on deformation control starts late. Based on the practice of the railway logistics center yard, the deformation characteristics of the deep foundation pit of the railway logistics center yard are studied deeply and systematically, and the deformation control method is put forward. The AHP method is used to determine the weights of the factors in each stage, and the fuzzy set method is used to determine the degree of membership and to sort the risks. Based on the hierarchical structure of these factors, a three-stage fuzzy comprehensive evaluation model is proposed. Through analyzing the factors affecting the construction of metro stations, the comprehensive evaluation index system of the construction risk of a metro station foundation pit is established. However, due to the high complexity and regional characteristics of the city railway logistics center yard foundation strengthening project, although there are a lot of railway logistics center yard foundation strengthening project practices, there is no systematic understanding of its deformation characteristics of theoretical research, coupled with the foundation pit itself is a theory seriously lagging behind the practice of the subject, design, to be more accurate and reliable to predict its deformation is often more difficult. If the deformation of the retaining structure caused by deep foundation pit excavation and its influence on the surrounding environment can be predicted comprehensively and accurately, economic and reasonable retaining scheme and construction measures can be adopted, accidents of a deep foundation pit can be reduced, or resources can be avoided effectively. Introductionĭeformation control is one of the core contents in the design of deformation control for the foundation reinforcement project of a railway logistics center. The experimental results show that this method can use the least tamping pit filler under the same conditions, with a minimum of 7.34 m 3 to realize foundation reinforcement, the maximum ground settlement is only 5.98 mm, and the maximum lateral displacement of pile top is only 6 mm, which can meet the actual requirements and has high practical value. ![]() Based on the analysis of the engineering geology and hydrogeological conditions of the site, the deformation of the site is calculated, the bearing capacity of the surrounding environment of the foundation pit to the additional deformation is analyzed, and the reinforcement mechanism of the yard foundation in the railway logistics center is proposed to realize the reinforcement of the yard foundation. The basic principle of thermodynamics is introduced, and the influence of temperature on the soil properties of foundation is analyzed. In view of the existing methods of foundation reinforcement considering the deformation of the site and the poor effect of the foundation reinforcement, a method of the foundation reinforcement of a railway logistics center station based on deformation control and thermodynamics is proposed.
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