基于自平衡法的红河水渡槽桩基竖向抗压静载监测研究

Research on Vertical Compressive Static Pressure Load Monitoring of Pile Foundation of Honghe Water Aqueduct based on Self-balance Method

为监测渡槽桩基竖向抗压静载能力,故设计基于自平衡法的红河水渡槽桩基竖向抗压静载监测方法。按照设计流程,对静载试验进行准备,提出合理的自平衡试验原理,确定平衡点位置。在此基础上,结合自平衡试验加载方式与桩身的受力特点,计算桩身极限抗压承载力,构建自平衡试桩荷载传递模型,以完成渡槽桩基竖向抗压静载监测。设计完成后进行验证分析,结果表明:所设计的方法能准确进行最大沉降量与位移值,且能分析桩端反力位移情况、试验桩侧阻力、端阻力分担荷载比例以及顶荷载作用下桩身轴力变化情况,满足设计要求。

In order to monitor the vertical compressive static load capacity of aqueduct pile foundation,a monitoring method of vertical compressive static load of Honghe water aqueduct pile foundation based on self-balancing method is designed.According to the design process,prepare for the static load test,put forward a reasonable self-balancing test principle,and determine the balance point position.On this basis,combined with the loading mode of self-balancing test and the stress characteristics of pile body,the ultimate compressive bearing capacity of pile body is calculated,and the load transfer model of self-balancing test pile is constructed to complete the vertical compressive static load monitoring of aqueduct pile foundation.After the design is completed,the verification analysis is carried out.The results show that the designed method can accurately calculate the maximum settlement and displacement value,and can analyze the pile end reaction displacement,the side resistance of the test pile,the load-sharing ratio of the end resistance and the axial force change of the pile shaft under the top load,which can meet the design requirements.