Abstract：Research purposes: In the past geophysical prospecting，the P—wave velocity of terrane was obtained with shallow seismic refraction method．But with the shallow seismic refraction method，the terrane velocit)r nearby the deep buffed tunnel portal could not be obtained because of the limitations of the theory and the hypocenter energy source．In That way，there was no enough evidence to sort the surrounding rock．So，it is necessary and urgent to do the research on sorting the surrounding rock with the technology of telhffc electromagnetic sounding．
Research conclusions: There are some very big limitations for getting the P—waves of the surrounding rock of deep buffed tunnel with the shallow seismic refraction method．Therefore，the telluric electromagnetic sounding sounding has become the major method for railway geological exploration．Using the telluric electromagnetic sounding Call effectively distinguish the resistivity and its outcomes can be as the basis to judge the integffty of surrounding rock，So it is feasible to use the telluric electromagnetic sounding to sort the surrounding rock．
许广春. 大地电磁测深进行隧道围岩分级的可行性研究[J]. 铁道工程学报, 2010, 27(8): 83-86.
XU Guang—chun. Research on Feasibility of Sorting Surrounding Rock of Tunnel with Telluric Electromagnetic Sounding. 铁道工程学报, 2010, 27(8): 83-86.
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2010, Vol. 27 
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