Abstract：Research purposes: The stability of foundation pit of high building relates closely to the deformation of exterior—protected construction，soil condition and hydrographic condition．The surface subsidence and wall displacement can be controlled effectively if the deformation，soil and hydrographical conditions are treated well．This paper analyzes the distribution regulation and influence factors of the displacement of the foundation pit during excavation through optimal distribution of the measurement spots based on the mathematical statistical principle and with the help of the simulation calculation result of the excavation with finite element，and offers the optimal program for distribution of measurement spots based on the principle of reducing the measurement error for providing the basis for the construction．
Research conclusions: Through the analyses the deformation of strip exterior—protected construction for foundation pit，optimum of measurement spots and analyses of the measured data，the followings are concluded：(1)The horizontal displacement of the exterior—protected construction depends on the excavation depth，width of foundation pit，soil nature，wall rigidity and embedded depth．(2)The measurement spots for the displacement of the wall top should be installed from the span center to both sides evenly，and the measurement spots for the wall should be installed at the supporting place of slightly higher than the deep excavation place with the beginning from the center and from top to bottom．(3)The real—time monitoring should be done in the course of the excavation for predicting the deformation regulation，taking preventive measures in time，lowering the deformation speed and guaranteeing the optimum of measurement spots and the construction safety．
李凤超. 高层建筑基坑变形内力分析及量测点优化[J]. 铁道工程学报, 2009, 26(5): 8-11.
LI Feng—chao. Analyses of Internal Force for the Deformation of Foundation Pit of High Building and Optimum of Measurement Spot. 铁道工程学报, 2009, 26(5): 8-11.
2009, Vol. 26 
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