摘要
粗粒料湿化变形特性对土石坝静力稳定有着显著影响。目前开展的三轴试验和直剪试验研究,一般只能进行干样和饱和样的试验,而对于非饱和情况研究较少。基于粗粒料不同围压下湿化变形试验研究成果开展数值模拟研究,结果表明:湿化变形的影响可以通过改变细观剪切模量和细观摩擦系数来实现;随着颗粒破碎随饱和度和围压的增加,湿化后粗粒料的强度低、内聚力降低,但摩擦角变化不大。
Wetting deformation, which has significant effect on the stability of rock-filling dams, has been studied mainly by triaxial tests and direct shear tests. The indoor test is widely used to study the wetting deformation of dry samples and saturated sample, but few researches focus on unsaturated materials. Based on the test results of coarse aggregate materials under different confining pressures, the wetting de- formation was studied by numerical simulations. The results indicate that the influence of the wetting de- formation can be obtained by changing the micro shear modulus and friction coefficient. Particle breakage of coarse aggregate is increased with the increase of saturability and confining pressure. The shear strength and cohesion of the coarse aggregate materials decrease after wetting deformation, and the friction angle basically remains unchanged.
出处
《防灾减灾工程学报》
CSCD
北大核心
2012年第5期535-538,551,共5页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家杰出青年科学基金项目(50825901)
国家自然科学基金项目(51109068)资助
关键词
粗粒料
颗粒流
湿化变形
抗剪强度
coarse aggregate material
particle flow
wetting deformation
shear strength
