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土石坝的液化稳定性评价一般都是基于Biot理论的。对于大型复杂问题,特别是当孔隙流体难以压缩或者土骨架的渗透性很低的情况下,采用耦合方法对Biot方程中的孔隙流体场和固体场同时进行求解往往是不经济甚至不可靠的。而对每个子场进行解耦求解是一种有效的方法。为了充分利用程序资源,着眼于能够应用于现有热–力学耦合场分析软件二次开发的解耦方法。首先对Biot方程和热–力学耦合场控制方程进行了对比研究,然后提出了一种多步迭代分割算法。该算法采用微分形式,对二维或三维问题、静力或动力问题都适用,能应用于各种单元类型。随后,应用这种新方法对上海青草沙水库围堤地基进行了液化分析,并得到了有价值的结论。
The evaluation of liquefaction stability of earth-rock dams is generally based on the Biot theory. For large and complex problems, especially when the pore fluid is difficult to compress or the permeability of the soil skeleton is very low, it is not always economical or even reliable to adopt the coupling method to solve simultaneously the pore fluid field and the solid field in the Biot equation. It is an effective method to decouple each sub-field. In order to make full use of the program resources, we focus on the decoupling method which can be applied to the secondary development of the existing thermo-mechanical coupling field analysis software. First, the Biot equation and thermo-mechanical coupling field governing equations were compared, and then a multi-step iterative segmentation algorithm was proposed. This algorithm takes the form of differential and is applicable to two-dimensional or three-dimensional problems, static or dynamic problems, and can be applied to various unit types. Subsequently, this new method was used to liquefy the embankment foundation of the Qingcaosha Reservoir in Shanghai and valuable conclusions were obtained.