深长桩基础施工期岩溶处置实时效果无损检测方法研究

在理论分析基础上,结合京沪高速铁路桥桩基础岩溶处置工程,开展检测分析桥桩桩孔施工过程中冲击破岩地震波传播特征现场试验;研究岩溶空洞及其充填处置后不同地震波传播特征;明确岩溶及其处置效果典型特征。在相同试验点进行地震反射探测岩溶及其处置后状态试验,并在地表已知覆盖型岩溶地区进行地震反应特征试验。在3类测试试验基础上,处理试验数据,从反射波信号特征、同相轴等方面,总结典型岩溶及其处置后地震波现场实时无损检测方法与判别特征。

Study on Real-time NDT Method Applied in Evaluating the Performance of Karst Cave Treatment in the Course of Construction of Deep Bridge Piles Foundation

On the basis of theoretical analysis,combined with construction of the Beijing-Shanghai High Speed Railway bridge pile foundations in the karst area,tests of the seismic wave propagation characteristics were carried out on site.The seismic waves were generated in the course of breaking rocks.By these test data,the seismic wave propagation characteristics of karst caves before and after grouting were researched.The typical features of the karst caves and effect of treatment were found.Seismic reflection tests were made with ground surface seismic wave sources at the same test points.The karst cave known as shallows buried ground surface seismic source was also tested to explore the typical features of the karst cave and grounting effect.On the basis of the three kinds of tests,the test data,such as the characteristics of reflected wave signals,and phase axes,etc,were processed,and the real-time NDT method and indices for discrimination were summarized.