汉沽双桥井曾做为唐山地震的地下水位异常的范例在国内外介绍,引起了人们的重视。现就观测条件及我们的认识介绍如下。 汉沽双桥井位于唐山断裂南侧,四周被盐滩包围,井深70米,为一浅层封存水,水的矿化度高达7克/升。含水层由浅海相沉积物组成,颗粒较细,顶板是厚达13米的粘土隔水层,因而受降水、蒸发、河渠、灌卤影响较小。底板粘土结构坚实,渗透问题可以排除。由此看来,双桥井的垂向封闭条件良好。 Shuangqiao well in Hangu was used as an example of abnormal groundwater level in Tangshan earthquake at home and abroad, arousing people’s attention. Now on the observation conditions and our understanding are as follows. Hangu Shuangqiao well is located in the south of Tangshan fault surrounded by saline beach, 70 meters deep, a shallow seal water, water salinity of up to 7 g / l. Aquifers are composed of shallow marine sediments with thinner particles. The roof is a clay aquitard with a thickness of up to 13 meters, so it is less affected by precipitation, evaporation, canals and irrigation. Floor clay structure is solid, the problem of infiltration can be ruled out. Seen in this light, double well vertical well closed conditions.