EVALUATION ON ENGINEERING GEOLOGICAL CONDITIONS OF LINGXIAO CAVERNS AMONG CHANGYUDONGTIAN LARGE ANCIENT UNDERGROUND QUARRY AT WENLING,ZHEJIANG PROVINCE

Changyudongtian World Geological Park,an ancient underground quarry cavern group,is located at Wenling City,Zhejiang Province. Based on the field investigation,the quarry were excavated by the ancients,which can be traced back to 1500 years ago,in a hill with the coverage of 16 square kilometers. Among of 28 large underground cavern groups in the underground quarry,Lingxiao cavern group is one typical example,with the height and span more than 55m and 28m respectively,for its main cavern. To clarify the reasons of long-term stability of these ancient caverns,the authors have carried out the study on the engineering geological conditions of the caverns,taking Lingxiao cavern group as an example. The achievements also accumulate the important geological documents for the protection of Changyudongtian ancient underground cavern groups and the safety guarantee of the tourists.