客运专线路基隐患的综合物探研究

Research on Comprehensive Geophysical Exploration for Hidden Danger to Subgrade of Passenger Dedicated Line

研究目的:新型客运专线路基具有新增级配碎石硬层及路基面以下非原状土的特点,使用传统钻探和取样等勘察方法受到限制,对隐患路基进行准确探测、排查及分类难度极大;同时,由于病害自身特点及其他外界因素干扰,技术难度风险极大。如何全面进行勘察,综合物探技术是最首要的选择。研究结论:通过研究总结了运营路基勘察综合物探技术:(1)含水量高的软弱路堑采用密点距电测深法或高密度电法为主;(2)压实度低的软弱路堑采用瞬态瑞雷波法为主;(3)路堑、路堤接触部分采用瞬态瑞雷波法、地质雷达法、轻型动力触探法;(4)遭受水浸或水害路基段以地质雷达法、瞬态瑞雷波法为主。可准确地揭示出路基现状和病害位置、规模及延展范围,使既有隐患路基得到及时、有效地整治,为高速铁路正常运营打下坚实基础。

Research purposes： As the new type of subgrade hardening layer with graded broken stones and there is soil difficult to survey, investigate and grade the hidden danger sampling method due to the limitations, the disease features exploration is the best way for the comprehensive exploration. of passenger dedicated line has the features that there is with unoriginal shape under the subgrade surface. It is to the subgrade with the traditional drilling method or and outside conference. The comprehensive geophysical Research conclusions： From the study and summarization on the comprehensive geophysical exploration for the subgrade, it is concluded： （1） The high density electrical sounding or high density resistivity methods should be used for the weak cutting with high water content. （2） The transient rayleigh - wave method should be used for the weak cutting with low compactness. （3） The GPR, transient rayleigh -wave and CPT methods can be used for the contacting parts of the cutting and embankment. （4） The GPR and transient rayleigh - wave methods are available for the water logging or water damaged subgrade. By using these methods, the subgrade status and its disease location, size and range can be revealed accurately, and therefore the hidden danger to the subgrade can be detected accurately and controlled timely to lay a solid foundation for the normal operation of the high - speed railway.