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中文摘要：
自密实混凝土在重力坝施工过程中受施工工艺、施工质量及施工环境等因素的影响,砂土颗粒间的胶结强度可能各不相同。为研究不同胶结强度的胶结砂土的力学特性,借助PFC3D自带的微观胶结模型,将胶结砂土中的胶结强度的分布定义为正态分布,并系统地分析了在不同方差和胶结含量下胶结砂土的力学特性。研究表明,胶结试样在数值试验中表现出应力应变软化特性及体变剪胀性,且随着胶结含量的增大,软化及剪胀程度提高;当偏应力达到峰值时,随着轴向应变的增大,体变由剪缩变化为剪胀。在假定的胶结砂样的胶结强度服从正态分布的情况下,峰值应力随着胶结含量成线性增大,但正态分布方差的变化对胶结砂样强度的影响不大。
英文摘要：
Influenced by construction technology, quality and environment in the construction process of rock-fill concrete gravity dam, natural cementation sands may have different cementation strengths between the sand particles. By using the microscopic model BPM of PFC3D, the distribution of the bond strength in cemented sand is defined as the normal distribution to study the mechanical properties of cemented soil with different bond strengths. The mechanical properties of cemented sands under different contents and variances are analyzed. The results show the strain softening and shear dilatation characteristics. And with the increase of cement contents, softening and dilatancy increase. When the deviatoric stress reaches the peak value, with the increase of the axial strain, the change of the volume is reduced by the shear contraction. The volumetric strain is changed from the shear shrinkage to dilatancy. With the assumption that the cementing of sample under the normal distribution cementation strength, the peak stress linearly grows with cement content, but charge of the normal distribution variances has a little influence on the cementation of strength.
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