【摘要】 试验井位于汕头市衡山路,观测系统为井下宽频地震计TBG-60B和地面宽频带地震计TDV-60B,频带为60S~50 Hz,选取的地面观测数据与对应的井下观测数据都是同一时间的,使用童汪练研究员的地噪声分析软件和MATLAB绘图工具,研究台站环境地噪声随观测井深度的变化特征,得到井深与观测地噪声之间的对比关系,为井下地震台站勘选和工程建设提供基础数据。发现地噪声水平从覆盖层进入到基岩有很大变化,从强风化层进入到中微风化层也有明显变化,考虑钻井建设成本和台站建设地噪声水平要求之间的综合效益,在粤东地区典型的地质结构条件,较佳的平衡点应该是至少需要进入完整中微风化层基岩10 m。更多还原

【Abstract】 The test well located in Hengshan road of Shantou, and the pilot hole observation system consist of the model TBG-60 B bore-hole wide frequency seismometer and the model TDV-60 B surface wide frequency seismometer with the frequency band of 60 s ~50 Hz both. The authors have concluded the contrast relationship between the hole depth and the observation seismic noise through researching variation characteristics of station environment seismic noise with pilot hole depth by using the seismic noise analysis software belongs to Tong Wanglian and the MATLAB software on the premise of selecting the observation data between ground surface and underground corresponding to the same time, which supplied the basic data of seismic station exploration in underground and engineering construction. The results show that seismic noise level has significant change from overburden to bedrock and from strongly-weathered bed to intermediately-weathered bed also including weaklyweathered bed. The optimized equilibrium is to enter the whole intermediately-weathered bed and weakly-weathered bed 10 meters at least, considering the comprehensive benefit between the drilling construction cost and station construction seismic noise requirement in special geological structure conditions of east-area in Guangdong.更多还原