登封观星台地基超高密度背景噪声探测

许多古建筑由于地基发生形变存在倾斜、坍塌等严重安全问题,古建筑地基探测及稳定性评价是进行安全预防的重要环节.背景噪声成像方法由于不依赖人工震源的特性,对探测区域无任何损害,利用其进行文物地基探测具有不损害文物的优势.应用该方法对河南省登封观星台地基情况进行超高密度无损探测.在观星台周围布设6条测线采集24 h数据进行互...

Ultra-high-density Ambient Noise Detection on the Foundation of Dengfeng Observatory

Serious problems such as tilts and collapses are found in a large number of ancient buildings due to foundation deformation, which makes foundation detection and stability evaluation of ancient buildings become an important work for safety incident prevention. Due to its independence from artificial seismic sources, the ambient noise tomography method causes no damage to the detection area, so that foundation detection of cultural relics using the method has the advantage of not harmful to cultural relics. In this paper, the method was first applied in ultra-high density nondestructive detection of the foundation of Dengfeng Astronomical Observatory in Henan Province. Six measuring lines were set up around the Observatory to collect 24-hour data for correlation calculation to obtain the virtual seismic single-shot records with high signal-noise ratio. The S-wave velocity structure of the underground 0-10 m stratum was derived from a 10-meter 10-layer model by using the phase-shifting technique to extract the wave dispersion curves from the virtual seismic single-shot records, with the S-wave velocity of 170-340 m/s. The detection results show that the foundation of the observatory is well stratified, with no low-velocity anomalies, and the stratification is consistent with the trail trench, conjecturing that the foundation structure is solid and stable.