The exploration of urban underground spaces is of great significance to urban planning,geological disaster prevention,resource exploration and environmental monitoring.However,due to the existing of severe interferenc...The exploration of urban underground spaces is of great significance to urban planning,geological disaster prevention,resource exploration and environmental monitoring.However,due to the existing of severe interferences,conventional seismic methods cannot adapt to the complex urban environment well.Since adopting the single-node data acquisition method and taking the seismic ambient noise as the signal,the microtremor horizontal-to-vertical spectral ratio(HVSR)method can effectively avoid the strong interference problems caused by the complex urban environment,which could obtain information such as S-wave velocity and thickness of underground formations by fitting the microtremor HVSR curve.Nevertheless,HVSR curve inversion is a multi-parameter curve fitting process.And conventional inversion methods can easily converge to the local minimum,which will directly affect the reliability of the inversion results.Thus,the authors propose a HVSR inversion method based on the multimodal forest optimization algorithm,which uses the efficient clustering technique and locates the global optimum quickly.Tests on synthetic data show that the inversion results of the proposed method are consistent with the forward model.Both the adaption and stability to the abnormal layer velocity model are demonstrated.The results of the real field data are also verified by the drilling information.展开更多
微动HVSR(Horizontal to Vertical Spectral Ratio)谱比法是分辨第四系覆盖层、松散层、尾矿堆积物厚度较为有效的方法,且工作方便快捷,利于施工。柳州市融水县多个矿区急需查明矿区内尾矿堆场储量,为更加清楚地获得矿区内尾矿堆场储量...微动HVSR(Horizontal to Vertical Spectral Ratio)谱比法是分辨第四系覆盖层、松散层、尾矿堆积物厚度较为有效的方法,且工作方便快捷,利于施工。柳州市融水县多个矿区急需查明矿区内尾矿堆场储量,为更加清楚地获得矿区内尾矿堆场储量情况,本文开展微动HVSR谱比法测量,结合矿区相关资料,划分了尾矿堆积物与基岩的分界线并分析其起伏情况,对尾矿堆积场厚度进行推断,并估算其储量。通过多个钻孔验证,钻孔揭露的尾矿堆积物厚度与物探异常推断的成果基本一致,取得了比较良好的物探勘查效果,为下一步尾矿库的处理及下一步工作提供了物探依据,该法可为划分尾矿库堆积物厚度工作提供参考。展开更多
基金Supported by projects of National Natural Science Foundation of China(No.42074150)National Key Research and Development Program of China(No.2023YFC3707901)Futian District Integrated Ground Collapse Monitoring and Early Warning System Construction Project(No.FTCG2023000209).
文摘The exploration of urban underground spaces is of great significance to urban planning,geological disaster prevention,resource exploration and environmental monitoring.However,due to the existing of severe interferences,conventional seismic methods cannot adapt to the complex urban environment well.Since adopting the single-node data acquisition method and taking the seismic ambient noise as the signal,the microtremor horizontal-to-vertical spectral ratio(HVSR)method can effectively avoid the strong interference problems caused by the complex urban environment,which could obtain information such as S-wave velocity and thickness of underground formations by fitting the microtremor HVSR curve.Nevertheless,HVSR curve inversion is a multi-parameter curve fitting process.And conventional inversion methods can easily converge to the local minimum,which will directly affect the reliability of the inversion results.Thus,the authors propose a HVSR inversion method based on the multimodal forest optimization algorithm,which uses the efficient clustering technique and locates the global optimum quickly.Tests on synthetic data show that the inversion results of the proposed method are consistent with the forward model.Both the adaption and stability to the abnormal layer velocity model are demonstrated.The results of the real field data are also verified by the drilling information.
文摘微动HVSR(Horizontal to Vertical Spectral Ratio)谱比法是分辨第四系覆盖层、松散层、尾矿堆积物厚度较为有效的方法,且工作方便快捷,利于施工。柳州市融水县多个矿区急需查明矿区内尾矿堆场储量,为更加清楚地获得矿区内尾矿堆场储量情况,本文开展微动HVSR谱比法测量,结合矿区相关资料,划分了尾矿堆积物与基岩的分界线并分析其起伏情况,对尾矿堆积场厚度进行推断,并估算其储量。通过多个钻孔验证,钻孔揭露的尾矿堆积物厚度与物探异常推断的成果基本一致,取得了比较良好的物探勘查效果,为下一步尾矿库的处理及下一步工作提供了物探依据,该法可为划分尾矿库堆积物厚度工作提供参考。
