Abstract：Research purposes: During construction of Yuanliangshan tunnel it has been found that 3 infrequent great deep buried caves exists near Yuanliang tunnel at core and eastern wing of Maoba carbonate rock syncline. In 2# cave of them occurred gushing water and sand many times. In 3# cave occurred even bursting eruption of clayey soil. After integrated analysis and research is performed of the filling characteristics of the said 3 caves and disaster pattern and description has been made for their formation mechanism and the geological basis will be given to the disposal design of the potential geological disaster.
Research methods: The geophysical prospecting on ground surface and in tunnel horizontal drilling and incline drilling in tunnel , test of fillings in cave，theoretical analysis are applied.
Research results: Through integrated prospecting and theoretical analysis，the basic features and disaster features of 3 caves developing and filling are found out. The formation mechanism of the caves has been defined preliminarily. The potential geological disasters of the 3 infilled caves have been disposed.
Research conclusions: Bedding detachment and longitudinal tension fractures located at core and eastern wing of the Maoba syncline cutting by transverse tension fractures（NW~NWW)，form the initial space and route way , which are the passage the deep cycle of karst aquifer. A type of deep flow cycle named inverse siphon cycle forms. The flow water dissolves the carbonate rocks along the route way. Conduits are formed by perennial corrosion of the water. The great cave forms due to corrosion and collapse of ceiling the cave. The cave is filled by clayey soil，which deposits due to the changes of the flow.
蒋良文,易勇进,贾中明. 圆梁山隧道毛坝向斜深埋大型充填溶洞及其形成机制分析[J]. 铁道工程学报, 2007, 24(4): 53-60.
JIANG Liang-wen,YI Yong-jin,JIA Zhong-ming. Research on Characteristics and Formation Mechanism of Great Deep Buried Infilled Caves at Maoba Syncline in the Yuanliangshan Railway Tunnel. 铁道工程学报, 2007, 24(4): 53-60.
2007, Vol. 24 
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