红层段地下水侵蚀性及岩层中石膏对某山区铁路的影响分析

结合某山区铁路红层区域地质勘探调查结果，对该段石膏盐岩层分布状况、环境水侵蚀性进行了统计分析、评价。结果表明:石膏盐岩层为层状分布，厚度以毫米计，地下水侵蚀性作用等级较低；石膏岩盐层并未带来硫酸根侵蚀性的显著增加；由于地下水通道的差别，侏罗系地层侵蚀性强于白垩系地层。根据施工揭示:该红层内薄层石膏的膨胀性对工程影响很小；堵塞排水管道的结晶物并非石膏；石膏层岩体的切割作用对隧道围岩整体稳定性影响很大，小进尺开挖、及时初喷初支可以很好地解决该问题。

Analysis on Ground Water Erosivity in Red Bed Zone and Influence of Gypsum in Rock Layer on a Mountain Railway

Combined with the results of geological exploration in the red bed zone of a mountain railway, distribution of gypsum salt beds and the environmental water erosivity in this section are analyzed statistically and evaluated. The results show that the gypsum-salt bed is layered, the thickness is mm, and the erosive effect of groundwater is lower, the gypsum layer does not bring a significant increase in the erosivity of sulfate, and the erosivity of the Jurassic stratum is higher than that in the Cretaceous stratum because of the difference of the groundwater passage. According to the construction situations revealed that it is considered that the expansibility of the thin gypsum in the red bed of the mountain railway has little influence on the project. The crystals that clogged the drainage pipes were not gypsum. The cutting action of gypsum layer to the rock mass has a great influence on the stability of tunnel surrounding rock mass. The problem can be solved by excavating with small footage and primary support in time.