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圆梁山深埋特长隧道是重庆至怀化铁路干线的关键性控制工程.在圆梁山向斜核部上二叠统吴家坪组(P3w)和向斜东翼中二叠统茅口组(P2m)碳酸盐岩中,揭露的3个特大型充填溶洞,有异于过去对于深部水循环缓流带只有溶孔和溶蚀裂隙的认识.运用USGS开放式PHREEQC软件,依据各钻孔中地下水水化学、水动力资料对圆梁山隧道毛坝向斜段进行了岩溶作用强度的模拟计算.模拟结果表明,从地层上来看,P3w的岩溶作用强于P2m,T1d(大冶组)的岩溶作用相对较弱;从岩溶发育的位置来看,向斜核部岩溶发育强度明显强于向斜翼部.毛坝向斜地下水系统中岩溶地下水的径流主要受控于断裂的影响,而不是由向斜的一翼径流至核部向另一翼排泄.
The Yuanliangshan deep-buried super-long tunnel is a key control project from Chongqing to Huaihua Railway.At the middle of the Permian Wujiaping Formation (P3w) and the Middle Permian Maokou Formation (P2m) carbon In the salt rock, the three large-scale filling caverns are different from those in the past for only the dissolved pores and the dissolution cracks in the buffer zone of the deep water circulation.Based on the open-source PHREEQC software of USGS, The karst action intensity of Yuanliangshan tunnel was calculated by dynamic data.The simulation results show that the karstification of P3w is stronger than that of P2m, and the karstification of T1d (Daye Formation) is relatively weak. In terms of karst development, the karst development strength in the syncline core is obviously stronger than that in the syncline wing. The runoff of karst groundwater in the maoba syncline groundwater system is mainly controlled by faults rather than by a syncline one-wing runoff To the core to the other wing excretion.