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对溇水上游河湾岩溶渗漏研究中,在湘鄂交界的溇水河谷,发现了大型古滑坡体和堰塞湖沉积粘土层并对其进行了研究。对古滑坡体和堰塞湖作了简要介绍,对一些主要问题进行初步讨论和分析。古滑坡体约2 000×104m3,进入河道长度大于1 000 m;湖相沉积层厚度大于48 m,最大出露高程284.1 m,根据14C测试,古堰塞湖形成于10 760±130~16 880±250 a BP。通过分析认为堰塞湖水位大于285 m,堰塞湖沉积粘土层中出露的高硫酸盐地下水与当时沉积环境和粘土层本身无直接联系,沿河两岸粘土层产状变化可能与再次滑坡有关联;该研究成果对当前水电工程建设和研究溇水河流发育史、现代江河灾难性地质灾害的形成演化具有一定参考价值。
In the study of karst seepage on the upper reaches of Lishui River, large-scale ancient landslide bodies and sedimentary clay layers of dammed lakes were found and studied in the Huangshui River valley at the border of Hunan and Hubei. The article briefly introduces the ancient landslide body and dammed lake, and discusses and analyzes some major problems. The ancient landslide body is about 2 000 × 10 4 m 3 and the length of the waterway is more than 1 000 m. The sedimentary layer thickness of the lake facies is more than 48 m and the maximum exposure height is 284.1 m. Based on the 14C test, the ancient dammed lake formed at 10 760 ± 130 ~ 16 880 ± 250 a BP. By analyzing that the water level of dammed lake is more than 285 m, there is no direct relation between the high sulfate groundwater exposed in the sedimentary clay layer of the dammed lake and the then sedimentary environment and the clay layer itself. The occurrence of clay layer changes along the banks may be related to the landslide The results of this research have certain reference value to the current hydropower project construction and research on the history of the Huangshui River and the formation and evolution of the modern river catastrophic geological disasters.