综合勘探技术在公路桥梁活动断裂地震危险性评估中的应用——以西宁高速天久大桥为例  

Application of Integrated Exploration Technology in Seismic Risk Assessment of Active Faults of Highway Bridges:Taking Xining Expressway Tianjiu Bridge as an Example

作　　者：严成明 赵敏[2] 陈华 YAN Chengming;ZHAO Min;CHEN Hua(Sichuan Communication Surveying and Design Institute,Chengdu 610017,China;Sichuan Earthquake Agency,Chengdu 610041,China)

机构地区：[1]四川省交通勘察设计研究院有限公司,成都610017 [2]四川省地震局,成都610041

出　　处：《科技和产业》2024年第23期309-315,共7页Science Technology and Industry

基　　金：国家重点研发计划(2020YFA0710603-01)。

摘　　要：则木河断裂与拟建西宁高速为同一走廊带,对拟建西宁高速影响极大。在断裂隐伏地段,首先利用高密度电法对断裂进行定位,然后利用浅层地震反射波法进一步追踪断层并利用反射波同相轴追踪确定错断层位,结合近场区地震地质调查综合分析判断断层活动性质。最后利用钻探工程验证综合推断解释结论,最终确定则木河断裂(塘河-八家村段)为一条全新世活动断裂。评价了工程场地地震稳定性,为高速公路桥梁设计提供了可靠资料。研究表明通过地质调查结合综合物探技术对断层进行定位后采用钻探验证的综合勘探技术是进行公路桥梁活动断裂地震危险性评估的一种有效方法。The Zemuhe Fault and the proposed Xining Expressway are located in the same corridor,which has a significant impact on the proposed Xining Expressway.In the concealed section of the fault,high-density electrical method was used to locate the fault,and then shallow seismic reflection wave method was used to further track the fault and determine the faulted layer using reflection wave phase axis tracking.Combined with near-field seismic geological survey,the activity nature of the fault was comprehensively analyzed and judged.Finally,drilling engineering was used to verify the comprehensive inference and interpretation conclusion,and it was finally determined that the Muhe fault(Tanghe Bajiacun section)was a Holocene active fault.The seismic stability of the engineering site was evaluated,providing reliable information for the design of highway bridges.Research has shown that using geological surveys combined with comprehensive geophysical techniques to locate faults and then verifying them through drilling is an effective method for assessing the seismic risk of active faults in highway bridges.

关 键 词：断裂勘察 则木河断裂带 高密度电法 浅层地震 钻探 

分 类 号：P31[天文地球—固体地球物理学]