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通过对东北大学秦皇岛分校综合实验楼深基坑桩锚支护工程现场试验,研究分析了深基坑开挖过程中桩身土压力、钢筋应力及弯矩的分布和变化规律。研究表明:基坑开挖和锚杆及其预应力施加是桩身内力变化的主要因素,预应力锚杆施加的影响较大;通过桩身钢筋应力反算土压力的大小与实测土压力大小及分布基本一致;实测土压力的大小介于朗金土压力和静止土压力之间。
Through the field test of the pile-anchor supporting project of the deep foundation pit of the Comprehensive Experimental Building of Qinhuangdao University, the distribution and variation regularity of the earth pressure, the stress and bending moment of the steel bar during the excavation of the deep foundation pit are analyzed. The research shows that the excavation of foundation pit and the application of anchor rod and its prestressing are the main factors for the change of internal force of pile body. The influence of prestressed anchor is greater. By comparing the earth pressure of pile reinforcement with the measured earth pressure And the distribution is basically the same; the measured earth pressure is between Lang King earth pressure and the rest earth pressure.