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考虑孔隙比影响的堆石料湿化试验及湿化模型

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对某堆石坝的坝壳料进行了不同密实状态下的单线法三轴湿化试验,分析了湿化变形随围压、应力水平以及初始孔隙比的变化规律.结果表明:在围压和应力水平相同条件下,随着初始孔隙比的减小,堆石料湿化轴向应变和体积应变均明显降低;初始孔隙比对湿化应力剪胀规律影响不大,采用对数形式的湿化剪胀方程可对不同初始孔隙比条件下的湿化应力剪胀关系进行统一描述.对指数形式的湿化轴向应变经验模型进行修正,构建了考虑初始孔隙比及应力状态影响的湿化轴向应变计算模型,并联立湿化剪胀方程推导了湿化体积应变的计算公式,通过对三轴湿化试验结果进行模拟验证了该公式的合理性.
Wetting deformation test and wetting model of rockfill materials considering effect of void ratio
The triaxial wetting test in single line method of rockfill materials with different initial void ratio was carried out,and the varies of wetting deformation with the confining pressure,stress level and initial void ratio were analyzed.The test results show that the axial and volumetric wetting deformation decreases with the decrease of the initial void ratio under the same confining pressure and stress state.Based on the test results,it can be found that the initial void ratio has little influence on the dilatancy law of wetting stress,and the logarithmic wetting dilatancy equation can be used to describe the wetting stress dilatancy relationship under different initial pore ratio conditions.In addition,the model for the axial wetting deformation with the consideration of initial void ratio and stress state was proposed by modifying the empirical exponential model.After that,the equation for the volumetric wetting deformation was derived by the stress-dilatancy equation.Finally,the rationality of the proposed model was validated according to the comparison with test results.

rockfill materialswetting deformation testinitial void ratiostress-dilatancy equationwetting deformation model

王柳江、毛航宇、刘斯宏、傅中志、韩华强、沈超敏

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河海大学水利水电学院,江苏南京 210098

河海大学土木与交通学院,江苏南京 210098

南京水利科学研究院岩土工程研究所,江苏南京 210029

堆石料 湿化试验 初始孔隙比 应力剪胀方程 湿化模型

国家重点研发计划项目国家自然科学基金青年科学基金项目国家自然科学基金青年科学基金项目江苏省卓越博士后计划项目国家自然科学基金面上项目

2022YFE010500052209160520090362022ZB18651979091

2024

10.3876/j.issn.1000-1980.2024.01.004

河海大学学报(自然科学版)
河海大学

河海大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.803
ISSN：1000-1980
年,卷(期)：2024.52(1)
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