Experimental Study On The Earth Pressure Distribution Of Pit Wall Retained By Anchored-Pile Structure

The research on distribution of the earth pressure is an ancient but still not satisfactorily resolved difficult problem in Geotechnical Engineering. Earth pressure has three forms, exists as static, active and passive, and contains two kinds of the method of calculating as the limit state calculation of earth pressure and non-limit state calculation of earth pressure. Combined with the measured earth pressure at different depths of the pile-anchor retaining structure, this paper mainly studies the non-limit state of four earth pressure models, these are Zai JinMin model, and Xu RiQing model, Chen YeKai model and Lu GuoSheng model, compares the applicability and distribution characteristics, and gives some recommendations to determine earth pressure of the actual project.Combined with the monitoring of the third bid of Jing-Sha speediness channel in Zhengzhou City, using Microsoft Visual Basic6.0Programming the four models algorithm were calculated, the static earth pressure and the active and passive earth pressure results under limit state, and finally drawing comparison with the measured earth pressure, the main conclusions are as follows:(1) Under good engineering geological conditions in Zhengzhou, the measured displacement values of pile anchor foundation pit are less than3mm.(2) Calculate the four theoretical models, quasi active displacement and small case, Zai JinMin model, Xu RiQing model and Chen YeKai model are basically equal to the static earth pressure; the results of Lu Guosheng model are too small. In case of quasi passive displacement is very small, the model of Xu RiQing and Chen YeKai model are basically equal to the earth pressure at rest, Zai JinMin model due to the passive earth pressure correction coefficient is approximately equal to1.3times the earth pressure at rest, increases with the increase of displacement, Lu Guosheng model calculations are relatively large, and the displacement is proportional to the faster growth.(3) Using the method of hanging cloth install earth pressure cells, it must be strictly in accordance with the provisions operate to ensure that the exact location of the earth pressure cells and in the process of pouring concrete, earth pressure cells is not concrete or mortar parceled. Recommended that the pocket used to put the earth pressure cell can be a little on shift from100to200mm, should not be located at the center of the hanging cloth (1000mm x1500mm). In future monitoring process, the earth pressure cells must be protected patiently to improve the survival rate and accuracy.(4) The measured values of earth pressure cells increase with increasing temperature, the temperature increases10℃, the pressure only increases2.61kPa, and the change in uniform.(5) The relationship between the earth pressure and depth is roughly triangular linear.(6) Under excellent engineering geological conditions, deep horizontal displacement values of row piles are less than3mm, the value of earth pressure can be considered as earth pressure at rest in engineering design and construction process for security.