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Study on wetting deformation characteristics of coarse granular materials and its simulation in core‐wall rockfill dams
International Journal for Numerical and Analytical Methods in Geomechanics ( IF 4 ) Pub Date : 2020-01-10 , DOI: 10.1002/nag.3042
Xiongxiong Zhou 1, 2 , Shichun Chi 1, 2 , Maohua Wang 1, 2 , Yufeng Jia 1, 2
Affiliation  

The wetting deformation of coarse granular materials is often considered to be an important cause of the core wall rockfill dam cracks during impounding. By analyzing existing research results, this paper proposes a hyperbolic relationship between the wetting axial strain and wetting stress level and puts forwards a warped surface relationship among spherical stress, shear stress, and the ratio of wetting volumetric strain to wetting axial strain. To illustrate its practicability, the wetting strain model's parameter determination process is introduced and the rockfill materials wetting parameters are determined using the triaxial wetting test data. Moreover, the collapse settlement of Guanyinyan rockfill dam during first impounding is numerically simulated using the proposed method to calculate rockfill wetting deformation and verified by field measurements and monitoring data. The results show that the calculative method of wetting deformation proposed in this paper is reasonable and practical; the wetting deformation of upstream rockfill materials would cause an adverse deformation trend, which may lead to crack occurrence at the upstream slope and dam crest; and the Guanyinyan rockfill dam cracks on the top of junction mainly caused by the wetting deformation of upstream rockfill.

中文翻译:

心墙堆石坝粗粒料的湿润变形特性及其模拟研究。

粗粒料的润湿变形通常被认为是蓄水过程中岩心墙堆石坝裂缝的重要原因。通过分析已有的研究成果,提出了湿润轴向应变与湿润应力水平之间的双曲线关系,并提出了球形应力,剪切应力与湿润体积应变与湿润轴向应变之比之间的翘曲表面关系。为了说明其实用性,介绍了润湿应变模型的参数确定过程,并使用三轴润湿测试数据确定了堆石料的润湿参数。此外,利用提出的方法对观音岩堆石坝初次塌方沉降进行数值模拟,计算堆石的湿润变形量,并通过现场实测和监测数据进行验证。结果表明,本文提出的润湿变形的计算方法是合理可行的。上游堆石料的湿润变形会引起不利的变形趋势,可能导致上游边坡和坝顶出现裂缝。交汇处顶部的观音岩堆石坝裂缝主要是上游堆石的湿润变形引起的。上游堆石料的湿润变形会引起不利的变形趋势,可能导致上游边坡和坝顶出现裂缝。交汇处顶部的观音岩堆石坝裂缝主要是上游堆石的湿润变形引起的。上游堆石料的湿润变形会引起不利的变形趋势,可能导致上游边坡和坝顶出现裂缝。交汇处顶部的观音岩堆石坝裂缝主要是上游堆石的湿润变形引起的。
更新日期:2020-01-10
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