摘要
为探索剪切过程中粗粒土能量演化与强度参数间关系,采用直剪试验对粗粒土的能量演化过程及强度特性进行分析,根据能量守恒原理,结合Mohr-Coulomb强度准则,推导能量与强度参数能量平衡方程,建立了理论模型与适用模型并对模型进行论证与分析,探讨粗粒土能量与强度参数的定量关联,结合MATLAB分析函数,对模型应用进行探讨。研究结果表明:因棱角型颗粒能量演化过程剧烈,棱角型接触颗粒强度参数取值大于圆型,达到应力峰值临界状态外力做功能量大;不同法向应力下,最后一阶段外力做功F(c,φ)与强度参数值呈线性关系,随强度参数值增加而增大,其偏微分方程将无限收敛于定值f(cα,φβ)。研究结果可用于分析路基填料受剪情况与能量演化过程,反演满足工程需要的强度参数值。
In order to explore the relationship between the energy evolution and the strength parameters of coarsegrained soils during shearing,a direct-shear test was conducted to analyze the energy evolution process and strength characteristics of coarse-grained soils.According to the principle of conservation of energy,the Mohr-Coulomb strength criterion was used to derive the balance equation between energy and strength parameters.A theoretical model and an applicable model were established,demonstrated and analyzed,to explore the quantitative correlation between energy and strength parameters of coarse-grained soils.Combined with MATLAB analysis function,the application of the models was discussed.The results have shown that:due to the intense energy evolution process of angular particles,the strength parameters of angular contact particles were larger than that of circular particles,with greater energy of the work done by external force to reach the critical peak stress;under different normal stresses,at the final phase,the work done by external force—F(c,φ)was linearly dependent on strength parameter values,and increased with the increase of the strength parameter values.Furthermore,its partial differential equation converged infinitely to the fixed value—f(cα,φβ).The research results can be used to analyze the shearing condition and energy evolution process of the roadbed filler,and to invert the strength parameter values that meet the engineering needs.
作者
荀晓慧
何亮
贺晓东
XUN Xiaohui;HE Liang;HE Xiaodong(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu 610059,China;Chelbi Engineering Consultants,Inc,Beijing 100029,China)
出处
《工程地质学报》
CSCD
北大核心
2021年第5期1331-1341,共11页
Journal of Engineering Geology
基金
国家重点研发计划项目(资助号:2017YFC1501000)
国家自然科学基金项目(资助号:42072303)
四川省教育厅科研计划重点项目(资助号:18ZA0045)。
关键词
粗粒土
直剪试验
强度参数
能量演化
能量守恒
Coarse-grained soil
Direct shear test
Strength parameter
Energy evolution
Conservation of energy
