堆石颗粒浸水破碎引起堆石料湿化变形研究

doi:10.12068/j.issn.1005-3026.2023.11.017

摘要/Abstract

摘要： 为研究堆石料的湿化变形，首先通过室内颗粒破碎试验分析了粒径对岩石颗粒强度和软化系数的影响；然后依据散粒集合体应力与应变张量表达式和岩石颗粒的软化系数，建立了饱和与干燥试样的应力-应变转换关系，结合双线法预测了堆石料的湿化变形；最后通过算例分析了该方法的有效性.结果表明:浸水湿化会降低岩石颗粒的强度，饱和与干燥玄武岩颗粒的强度均服从Weibull分布；颗粒特征强度随粒径的增加而降低，但是Weibull模量和颗粒的软化系数没有明显的粒径相关性.堆石料饱和与干燥试样的应力-应变关系可通过岩石颗粒软化系数进行变换；由饱和试样的应力-应变关系和岩石颗粒软化系数可估算堆石料浸水后因颗粒破碎引起的湿化变形.算例中预测结果与试验结果整体比较接近，表明岩石颗粒浸水后强度降低导致的颗粒破碎是堆石料产生湿化变形的主要原因.

关键词: 堆石料；湿化变形；软化系数；颗粒破碎；应力-应变曲线

Abstract: To study the wetting deformation of rockfill materials， the effect of particle size on the strength and softening coefficient of rock particles was first analyzed by laboratory single-particle crushing tests. Then the stress-strain transformation relation between saturated and dry specimens was established by using stress and strain tensor expressions of granular aggregate and the softening coefficient of rock particles， and the wetting deformation of the rockfill materials was predicted using the double-line method. Finally， the effectiveness of the method was evaluated based on the example analysis. The results show that wetting reduces the strength of the rock particles， and the crushing strength of both saturated and dry basalt particles conforms to a Weibull distribution. The characteristic strength of the particles decreases with increasing particle size， although the Weibull modulus and the softening coefficient of the particles are minimally affected by particle size. The stress-strain relationship between saturated and dry specimens of rockfill materials can be converted by the softening coefficient of the particle. The wetting deformation caused by particle breakage can be estimated by the stress-strain relationship of the saturated specimen and the particle softening coefficient. The predicted results are consistent with the test results overall， indicating that particle breakage due to the reduction of particle strength after water immersion is the main reason for the wetting deformation of rockfill materials.

Key words: rockfill materials; wetting deformation; softening coefficient; particle crushing; stress-strain curve

中图分类号:

TU41

王晋伟，迟世春，邵晓泉. 堆石颗粒浸水破碎引起堆石料湿化变形研究[J]. 东北大学学报（自然科学版）, 2023, 44(11): 1638-1646.

WANG Jin-wei， CHI Shi-chun， SHAO Xiao-quan. Study on Wetting Deformation of Rockfill Materials Caused by Particle Water-Immersed Crushing[J]. Journal of Northeastern University(Natural Science), 2023, 44(11): 1638-1646.

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