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为有效评价青荣城际铁路桃村跨线断裂带的地基稳定性,提出采用断层测龄、地基加固处理和路基沉降变形监测等技术,来保障铁路工程设计建设。通过对桃村断层泥中石英形貌测龄和宏观特征研究,判断其最晚活动时间分布在更新世早、中期,是非活动断层。采用强夯施工对断裂带地基进行加固处理,检测结果显示,1 200 k N·m的强夯夯击能明显提高断裂带5 m以内地基的压实程度和力学性能,消除跨线断裂带地基的不均匀沉降。对跨线断裂带上路基沉降变形的长期监控结果表明,断裂带线下工程的沉降趋于稳定,具备铺轨条件。
In order to effectively evaluate the foundation stability of the Taocun over-line fault zone of Qingrong Intercity Railway, the authors propose that the technologies of fault age measurement, foundation reinforcement and subsidence deformation monitoring should be adopted to ensure the design and construction of railway engineering. Through the study of quartz topography age and macroscopic features in the fault mud of the Taocun fault, it is judged that the latest activity time distribution is in the early and middle Pleistocene, and is an inactive fault. Dynamic compaction is used to reinforce the foundation of the fault zone. The test results show that the compaction of 1 200 kN · m can significantly improve the compaction and mechanical properties of the foundation within 5 m of the fault zone, and eliminate the foundation of the overlying fault zone Uneven settlement. The long-term monitoring results of subgrade settlement and deformation on the cross-fault zone show that the settlement of the sub-line project in the fault line tends to be stable with the laying conditions.