摘要
用土石坝静力学模型试验不仅能以高精度测出模型坝体内各点的垂直位移w、水平位移u,还能根据u、w值推算出坝体内各点的应力水平,找出剪切破坏区,从而评价坝体稳定性。在试验中不仅可以考虑非线性应力应变,也可以在模型中实现渗流和地震荷载的模拟。目前已能初步形成一套较完整的模型试验和成果分析方法。笔者以我国某大型水电站上游堆石围堰模型试验得出的u、w实测数值为基础,运用本文介绍的分析方法给出了坝体在各个阶段的应力水平等值线图。这些图显示出该坝体在原设计中的薄弱环节。文中还提出了相应的工程措施。
In statical model test of earth and rockfill dams, not only can the vert;cal displacement w and horizontal displacement u at each point in a dam be measured precisely, but also the stress levels can be calculated, thus finding out the shear failure zones, we can evaluate the stability of the dam. The nonlinear relation of stress and strain can be considered, and seepage and earthquake's load can be simulated in the model test too. A set of rather complete method of modcl test and result analysis have boon formed originally. The authors have drawn the stress level iso-grams, vhich are based on the measured values of u,w in the rockfill coffer-dam model in the upper reaches of a big hydroelectric power station in China. Tbese isograms have shown the weakness of the original design of the dam, therefore the engineering countermeasures have been put forward.
出处
《水力发电学报》
EI
CSCD
北大核心
1993年第3期28-37,共10页
Journal of Hydroelectric Engineering
