考虑颗粒破碎的堆石料蠕变特性研究

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王峰,迟世春,王振兴.考虑颗粒破碎的堆石料蠕变特性研究[J].,2017,57(6):577-584

考虑颗粒破碎的堆石料蠕变特性研究

Research on creep behavior of rockfill materials considering particle breakage

DOI：10.7511/dllgxb201706005

中文关键词:堆石料单粒强度试验 Weibull分布颗粒级配演化

英文关键词:rockfill materials single-particle strength test Weibull distribution evolution of particle grading

基金项目:国家自然科学基金资助项目(51379029).

作者	单位
王峰,迟世春,王振兴

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中文摘要:

高土石坝竣工之后，坝体内堆石颗粒会不断发生破碎和重组，这在宏观上表现为堆石体不断产生蠕变变形．过大的堆石体蠕变变形会使得大坝防渗体发生破坏，从而危害大坝的安全运行．颗粒破碎是导致堆石体蠕变的主要因素之一，为研究颗粒破碎效应对堆石料蠕变特性的影响，在堆石料单粒强度的Weibull分布和颗粒分形破碎理论的基础上，引入了考虑时间效应的颗粒延迟破坏强度公式，并推求了蠕变条件下堆石料的级配演化过程．之后通过建立蠕变和破碎参量的关系，实现了对三轴试样蠕变变形的计算．最后通过堆石料三轴蠕变试验验证了方法的有效性．新提出的方法不仅能合理预测堆石料的蠕变变形，而且可以较好地反映蠕变过程中试样级配曲线的演化．

英文摘要:

After the completion of high rockfill dams, particle breakage and reorganization occurred continuously in the dam cause the significant creep deformation of rockfill materials (RFMs). Oversize deformation of RFMs will lead to impervious system failure and affect safety operation of the dams. Particle breakage is one of the main factors that lead to the creep of RFMs. To research the effect of the particle breakage on the creep, based on the Weibull distribution of the particle strength and particle fractal crushing theory, a time-dependent particle delayed failure strength formula is introduced and a method for the prediction of particle grading evolution during the creep process is proposed. Then, by building the relationship between the creep and relative breakage parameters, the creep deformation of the triaxial sample is calculated. Finally, the validity of the method is verified by the triaxial creep tests. The new method can not only well predict the creep deformation of RFMs, but also well reflect the evolution of the particle grading curve during the creep process.

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