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In recent years, with the rapid development of China's economic construction , the city 's high-rise buildings have mushroomed in large numbers , to the high-altitude development and the development and utilization of underground space become the inevitable choice for sustainable development in the process of urbanization , and the resulting pit the rapid growth of the project . In the excavation engineering practice , there is the one hand, practice ahead of the theory , on the other hand , the theory can not correctly reflect the actual construction process and environmental effects . Therefore , the foundation supporting research and improvement of the theory is bound to generate tremendous role in promoting economic development and social progress , has a profound practical significance . Pit Supporting research progress in the field of design theory and calculation methods, models and field tests and numerical simulation are reviewed and summed up the inadequacies of the existing research , theory and practice of touch and common the role and field trial research , conventional methods can not accurately calculate the soil displacement and pit the top of fewer additional load on the case studies . Secondly, the use of existing pit design and calculation method , application management is geotechnical software deep foundation pit pile-anchor retaining structure design calculations to establish the scale field tests and numerical simulation results . Again , relying on Northeastern University at Qinhuangdao laboratory building excavation engineering from four earth pressure , pile internal forces , bolt deformation , the bolt axial force to expand field trials to test the conventional design calculation methods and numerical simulation the accuracy of the calculation reference . Since then, the use of engineering numerical simulation of a professional geotechnical program FLAC3D model unbalanced force , soil vertical stress , horizontal and vertical displacement of the soil supporting pile bending moment , the bolt axial force increases the distribution of time and length changes were analyzed , and in a different anchor prestressed soil under the horizontal displacement the different pit at the top of the additional loads , the bolt axial force variation analysis research . Finally, to obtain the benefit pit design research , and provide the basis for the safe, economical design and construction of the foundation pit support engineering .
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