室内模拟水岩作用对砒砂岩风化侵蚀的影响

Indoor Modeling the Effect of Water-Rock Interaction on the Weathering and Erosion of Pi-sandstone

针对取自内蒙古东胜至准格尔旗一带的砒砂岩,进行了室内水岩作用模拟试验,通过对初始水、溶滤水成分变化的分析,探讨了水对砒砂岩风化侵蚀的影响。结果表明:试验溶滤水的Ca2+、Mg2+及HCO3-的浓度普遍降低,Na+、K+的浓度普遍升高,SO24-、Cl-的浓度在模拟试验后未明显变化。对水样测试结果的逆向模拟表明:矿物转化量越大,其溶解的矿物量就越多,产生的次生矿物量就越大,导致岩体的抗侵蚀性降低;8组岩样的初始差异性,造成差异性水岩化学作用,加剧了砒砂岩风化侵蚀。

Using the Pi-sandstone, which were got from Dongsheng to Zhungeer region in the Inner-Mongolia, we conducted the indoor water-rock interaction simulating. By using water composition changes of the initial water and infiltration, the impact of water on the erosion of rock weathering was analyzed. Ion content change of lixiviated water of the simulation experiment is as below ： concentration of Ca2 ＋ , Mg2＋ and HCO3- are general- ly lower; concentrations of Na ＋ , K ＋ are generally increased ; concentrations of SO2-4 , Cl - have not changed before and ＇after the simulation. In- verse modeling of water sample test results show that： the water-rock interaction changes the mineral composition of the Pi-Sandstone, rock resist- ance to erosion reduces. The initial differences of 8 series of rock samples, result in differences in water-rock chemical reaction, which exacerbates the sandstone weathering and erosion; Inter-Mongdia.