Deep Foundation Pit Slope Reinforced With Piles Of Minimum Potential Energy Analysis Method

At present, the more application of slope stability analysis method in deep foundation pit is still the limit equilibrium method. This method applies widely, but there are also inadequate. Therefore, slope stability analysis methods are still developing, the minimum potential energy analysis is a recent development of the slope stability analysis. And then based on the principle that potential is the minimum of the balance and stability system, it obtains a displacement whose potential is the minimum from potential changes of whole slope, which makes a normal stress distribution of slip surface obtained directly. Finally, using the balance conditions and Moore-Coulomb strength criterion, it can get the safety factor directly. The concept of this method is simple and clear, and error compared to the traditional limit equilibrium method is in the accepted range, which makes the results credible. Based on the previous research work, it further considers minimum potential method of reinforcement of slope with anti-slide pile.First of all, this paper presents a simple introduction of the rock prism model proposed by Mauldon and Ureta and the two-dimensional model of a cylinder proposed by Li Xiaoqiang. Moreover, it proposes a slope stability analysis method considering shear potential bolt reinforcement measures. On the basis, this paper does the following work:1,Further considering minimum potential method of slide plane for any shape, it constructs the calculation formula of related safety factor.2,It analyses impact which common reinforcement measures of deep mixing pile (anti-slide pile) of foundation pit engineering on potential of slip mass, and constructs improved model of minimum potential method. Then, it deduces the calculation theoretical formulas.3,Numerical construction examples show that results of the method are rather close to the calculation results with other commonly used method, which expands the application scope of traditional minimum potential method. Checking the actual construction in this paper, it provides a detailed comparison to the minimum potential method without consideration of reinforcement measures and limit equilibrium method, which shows the feasibility of the method.Finally the minimum potential energy methods applied to the analysis of governance reinforcement of Shanghai Xintiandi Square's foundation pit slope project shows engineering applications of minimum potential method.