圆梁山隧道毛坝向斜段岩溶洞穴的发育深度探讨

在剖析岩溶发育深度控制模式的基础上 ,分析了毛坝向斜岩溶发育的控制性基准面 ,认为毛家院子以南 ,向斜核部及东翼 ,岩溶洞穴发育深度在海拔 90 0 m以上 ;向斜西翼及毛家院子以北的核部及东翼 ,岩溶洞穴发育深度应在海拔 85 0 m以上。

A RESEARCH INTO THE DEVELOPING DEPTH OF KARST CAVES OF YUANLIANGSHAN TUNNEL IN THE MAOBA SYNCLINE

Encircled by the Silurian shale and argillite layers which is almost 2000 m thickness and relatively water resisting, the Maoba syncline is a full hydrologic unit mainly consisting of soluble rocks. The developing depth of karst is controlled by multilevel outflows in this zone. Big karst springs and outlets of underground rivers, which are distributed along the borderline between the Lower Permian limestone and the Devonian and Silurian thick shale and argillite , control the maximum developing depth of karst. The main big springs and underground rivers developing in this zone are Maojiayuanzi (altitude is 923.98 m), Xiniudong (altitude 931.67 m ), Xiangshuidong (altitude 876 m), Feishuiya (altitude 772.075 m) and S 67 spring (altitude 1112.5 m ). Based on the above analysis of the control mode of karst's developing depth, this paper discusses the basal level that controls the karst's development in the Maoba syncline. The paper concludes that the developing depth of the karst cave is more than 900 m in the south of Maojiayuanzi, syncline kernel and its east leg, more than 850 m in the syncline's west leg and its kernel north to Maojiayuanzi and its east leg.