排桩-内支撑结构在深基坑支护中的应用  

Application of Row Pile-Internal Support Structure in Deep Foundation Pit Support

作　　者：李铮 Li Zheng(Huasheng Hydrogeological Exploration Co.Ltd.,CNACG,Handan,Hebei 056004)

机构地区：[1]中煤地华盛水文地质勘察有限公司,河北邯郸056004

出　　处：《中国煤炭地质》2022年第S01期129-132,165,共5页Coal Geology of China

摘　　要：基坑开挖时常受空间限制,支护难度大。为了解决这一问题,结合深基坑工程实际,在基坑开挖过程中选择排桩内支撑结构体系。在此基础上,建立计算模型,模拟开挖过程,分析排桩-内支撑结构的内力和变形,并在整个施工过程中监测支撑结构的水平位移,将仿真结果与现场实测结果进行对比。结果表明,模拟值与实测值的最小偏差为8.69%,最大偏差为14.50%,平均偏差为11.60%。模型计算的最大水平位移为18.08mm,实测最大水平位移为20.91mm,均小于报警值。由此可见,模拟计算结果与实测结果接近,误差较小,监测指标符合规范要求,保证了施工安全,达到了预期的效果。Due to space constraints,the support during foundation pit excavation is very difficult.To solve this problem,the pile row-internal support structure was selected during the excavation of the foundation pit according to the actual situation of the project.Furthermore,a calculation model was established to simulate the excavation process.Based on the model,the internal force and deformation of pile row-internal support structure were analyzed,and the simulation results were compared with the field measurements(horizontal displacement of support structure)that were monitored throughout the construction process.The results have shown that the minimum deviation between the simulated value and the measured value is 8.69%,the maximum deviation is 14.50%,and the average deviation is 11.60%.The calculated and measured maximum horizontal displacements are 18.08 mm and 20.91 mm,respectively,which are both smaller than the alarm value.It can be seen that the simulated values are close to the measured values,and the error is small.In addition,the monitoring value complies with the relevant specifications,which ensures the safety of construction and achieves the expected effect.

关 键 词：深基坑 排桩-内撑式支护结构 水平位移 

分 类 号：TU473[建筑科学—结构工程]