Dynamic Stability Test Of Soil Arching And Study Of Earth Pressure Theory On Anti-slide Piles

In China, there are over 65% mountain area, especially in China’s southwestern region. In the process of the western development of China, a large number of anti-slide piles were used in the construction of railway and highway in mountainous area, the construction of water conservancy project, in the excavation of deep foundation pit. Our country is located between a plurality of plates and has always been an earthquake prone country. So the dynamic stability of the anti-slide piles under the seismic load become an urgent problem now. The baffle between cantilever piles accounted for a large part of the total cost, it can effectively reduce the cost of the baffle between piles if we take soil arching into consideration.In this passage, theoretical analysis, indoor model test and theory deduction were used to study the factors that affecting the dynamic stability of soil between piles and the way to calculate earth pressure on anti-slide piles and baffle between piles. The detailed work is as follows:1) A mechanical analysis model of soil arching effect between piles was built to derive the reasonable arch axis equation of soil arch between piles. Then based on stabilized soil arching and the Mohr-Coulomb strength theory, we get the the calculation formula of reasonable pile spacing. According to the formula, we discuss the influence of pile width, landslide thrust, soil cohesion and internal friction angle on the pile spacing.2) Through the self-designed model box and the structure vibration table, we take orthogonal testing method to carry out soil dynamic stability model test. Through the analysis of the failure limit acceleration, we discuss the influence of the limit height,limit width, the parameters of soil.3) Based on soil arching effect theory, the calculation model of baffle between piles were built to calculate the earth pressure on the baffle. The result was compared with the current norms of Chongqing city.4) Draw lessons from the displacement method of structural mechanics, we add a virtual pile in the system, then based on the force balance equation, the force on virtual pile was transfer to the actual anti-slide pile, then we built up equations to calculate the force on the anti-slide piles, the result was compared with the formula in technical code for building slope engineering.5) According to the results of the shaking table model test and theoretical analysis,summarizes the cantilever anti-slide pile design theory in earthquake zones.