江苏镇江—扬州长江公路大桥桥基断裂断层泥定量研究

本文通过断裂层泥的矿物组分特征、粒度成分结构和分形、成熟度和目前活动度、石英碎屑形貌ＳＥＭ观测来分析与评价镇江至扬州长江公路大桥桥基断裂的抗震和抗断问题，得到主要影响桥基稳定性的ＮＷ－ＮＮＷ向世业洲场区优势断裂，主要活动时间为Ｑ３－Ｑ２。该研究对断裂带上建设特大型桥梁工程的区域稳定性综合研究和论证，以及对大桥工程的合理选址、设计和确保安全具有重大实际意义。

Quantitative Research on Fault Gouge from the Base of the Zhenjiang-Yangzhou Yangtze River Highway Bridge

Baed on the characterisitcs of mineral components, granulometric structure and fractal, maturity and present activity of fault gouge, and topotaxy of quartz fragments by SEM, aseismatic problem and fault-resistance problem of the bridge foundation of the Zhengjiang-Yangzhou Yangtze river highway bridge are analyzed and evaluated. It is concluded from the quantitative study of fault gouge that the Shiyezhou fault, which has a great effect on the stability of the bridge foundation, is a preferred fault. This study has great importance and practical significance for the synthetic study and demonstration of regional stability, the rationalization of site selection and design, and the safety of the oversize Yangtze River bridge project on the fault zone.