Abstract：Research purposes:As the new type of subgrade of passenger dedicated line has the features that there is hardening layer with graded broken stones and there is soil with unoriginal shape under the subgrade surface．It is difficult to survey，investigate and grade the hidden danger to the subgrade with the traditional drilling method or sampling method due to the limitations，the disease features and outside conference． The comprehensive geophysical exploration is the best way for the comprehensive exploration．
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．
Fu Ping． Determination of Bearing Capacity for Foundation By Using Rayleigh － wave Techniques［J］． Journal of Hebei Geology College，1992(1) : 81－87．
［4］ 铁道科学研究院． 广深线基床质量评估方法的研究［R］． 北京: 铁道科学研究院，1990．
Academy of Railway Sciences． Quality Assessment Method for Subgrade Bed of the Guangzhou － Shenzhen Railway Line ［R］． Beijing: Academy of Railway Sciences，1990．
Academy of Railway Sciences． The National “85 ” Scientific Research Project—Report of High Speed Railway， Bridge， Tunnel ’s Design Parameters " Research on High Speed Railway Subgrade Design Technology " ［R］． Beijing: Academy of Railway Sciences，1995．
Ge Shuangcheng． Application of Comprehensive Geophysical Exploration Technique to Hidden Trouble Detection of Dyke［J］． Progress in Geophiyscs，2006(1) :263－272．
［9］ 杜攀峰． 铁路路基病害的智能识别［J］． 铁道学报，2010 (3) :142－146．
Du Panfeng． Intelligent Recognition of Defects in Railway Subgrade［J］． Journal of the China Railway Society． 2010(3) : 142－146．
2013, Vol. 30 
版权所有 © 2014 《铁道工程学报》编辑部