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本文以两个水中填土坝——A 水库土坝(高60米)、B 水库土坝(高46米)作为实例,用有效应力法进行了施工期和施工完毕时坝坡的稳定分析.主要内容分为坝体土料物理、力学性质指标的选择,包括士料的试验方法和指标的整理步骤,特别是孔隙压力系数和消散系数的确定;施工期及土坝刚建成时坝体孔隙压力消散的几个计算方法和步骤,即三相二元、三相一元,二相二元问题和孔隙压力不消散等四种计算方法;并结合有效应力稳定分析方法,提出了各种计算方法所得成果的比较.最后根据坝体的大小,推荐采用三相二元或三相一元问题的解答,确定施工期的孔隙压力大小.
In this paper, two earth fill dams—A reservoir earth dam (60m high) and B reservoir earth dam (46m high) are taken as examples. The stability analysis of the dam slope during the construction period and the completion of construction is carried out by the effective stress method. The main contents are divided into the selection of the physical and mechanical properties of the dam earth material, including the testing methods of the materials and the finishing steps of the indicators, especially the determination of the pore pressure coefficient and the dissipation coefficient; the pores of the dam during the construction period and when the earth dam is just completed. Several calculation methods and steps of pressure dissipation, namely, three-phase binary, three-phase one-element, two-phase binary problems and pore pressure do not dissipate, and four calculation methods; combined with effective stress stability analysis methods, various calculation methods are proposed. Comparison of the results obtained. Finally, according to the size of the dam, it is recommended to use the solution of the three-phase binary or three-phase one-dimensional problem to determine the pore pressure during the construction period.