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王圪堵水库是在陕北无定河上待建的一项以灌溉为主的防洪、发电综合收益的水利工程,大坝高38米,考虑到该地区土料条件和吸取群众的筑坝经验,拟定以粉细砂做为该坝的坝料,并采用水力冲填方法施工,因此,这是一座均质的砂坝。由于坝料的渗透性好,浸润线相当高,坝体的绝大部分在浸润线之下,处于饱和状态。饱和的粉细砂受地震作用发生液化已引起人们的注意。王圪堵水库库址的地震烈度为七度。所以,在强度为七度的地震作用下能否液化和由于液化致使土坝产生严重破坏便成了王圪堵水库土坝设计中的一个重要技术问题。为了研究确定王圪堵水库土坝坝料的液化可能性,坝体的静应力和地震应力是不可缺少的资料。以下各节介绍应用有限元法研究计算该坝静应力和地震应力的方法,以及在DJS—21
The Wangjinggao Reservoir is a water conservancy project mainly built on irrigation-free flood control and power generation to be built on the Wuding River in northern Shaanxi. The dam is 38 meters high, taking into account the conditions of the soil in the area and the experience of building people’s dams. A powder sand was adopted as the dam material for the dam and was constructed by hydraulic filling. Therefore, this is a homogeneous sand dam. Because the permeability of the dam material is good, the saturation line is quite high, and most of the dam body is saturated under the saturation line. The liquefaction of saturated fine sands by earthquake has attracted people’s attention. The seismic intensity at the site of the Wangyaokou Reservoir is seven degrees. Therefore, whether or not liquefaction can occur under the earthquake with a strength of seven degrees and the earth dam is seriously damaged due to liquefaction has become an important technical problem in the design of the earth dam of Wangjinggdang Reservoir. In order to study and determine the liquefaction potential of Wangbaocang reservoir earth dam material, the dam static stress and seismic stress are indispensable data. The following sections describe the application of the finite element method to study the method for calculating the static and seismic stresses of the dam, as well as the DJS-21