[1]韩华强,陈生水,王占军,等.母岩变形特性差异对堆石料力学性质的影响[J].郑州大学学报(工学版),2020,41(03):67-71.
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母岩变形特性差异对堆石料力学性质的影响()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
41卷
期数:
2020年03期
页码:
67-71
栏目:
出版日期:
2020-07-29

文章信息/Info

Title:
Influence of deformation characteristics of mother rock on mechanical properties of rockfill materials
作者:
韩华强; 陈生水; 王占军; 郑澄锋; 傅华
文献标志码:
A
摘要:
强度及变形特性是反映母岩力学性质的两个基本指标，针对当前研究中很少甚至忽略母岩变形特性对堆石料力学性质的影响，采用大型静力三轴仪及大型渗透仪，分别进行了2种堆石料三轴试验和渗透试验，得到了不同岩性堆石料强度、变形和渗透特性的变化规律，初步分析了母岩变形特性差异对堆石料力学性质的影响机制。试验结果表明：母岩单轴抗压强度相同条件下不同堆石料的强度并不相同，母岩的变形特性对堆石料的力学特性同样具有重要影响，主要表现在强度及变形特性，对于堆石料渗透特性的影响则相对较小；影响机制主要体现在颗粒破碎和剪缩两个方面；堆石料的初始变形指标与母岩的变形指标具有正相关的关系，在剪切起始阶段，母岩变形指标越大，堆石料的强度增长越迅速，同等应变条件下，堆石料的强度也越大，但累积体积变形量及颗粒破碎量均相对较小；随着应变发展，当达到一定应力水平时，母岩变形指标相对较小的堆石料由于剪缩作用而累积了相对较大的体积变形，堆石料强度增长变缓的趋势相对较小，而变形指标大的堆石料颗粒破碎量显著增加，堆石料的强度增长相对变缓，母岩变形指标低反而有可能获得较大的峰值强度。建议应从母岩强度和变形特性两个方面研究母岩对堆石料力学特性的影响。
Abstract:
Strength and deformation characteristics are two basic indexes that reflect the mechanical properties of mother rock. But the influence of mother rock deformation on the mechanical properties of rockfill is seldom or even neglected in present studies. Based on the large-scale static three axis instrument and the large permeability apparatus, the triaxial tests and permeability tests were carried on two kinds of rockfill materials. Finally, the variations of strength, deformation and permeability characteristics with different lithological rockfill materials were obtained, and the influence mechanisms of deformation characteristics of mother rock on mechanical properties of rockfill materials were preliminary analyzed. The result shows that the deformation characteristics of mother rock also play an important role in the mechanical properties of rockfill materials, namely, the influence of mother rock on the mechanical properties of rockfill materials mainly lies in the strength and deformation characteristics, while the influence on permeability characteristics of rockfill is relatively small. The strength of different rockfill materials is not the same even though the mother rocks under the same uniaxial compressive strength. The influence mechanism of deformation characteristics of mother rock on the mechanical properties of rockfill materials is mainly reflected in two aspects: particle crushing and shear shrinkage. The initial deformation index of rockfill materials has a positive correlation with the deformation index of the mother rock, and in the initial stage of shearing, the more the deformation index of mother rock, the faster and the greater the strength of rockfill materials under the same strain condition, while the cumulative volume deformation and particle breakage are relatively small. With the development of rockfill strain, when a certain stress level is reached, rockfill materials with relatively small deformation index of the mother rock accumulated a relatively large volume deformation due to the shear shrinkage, which lead a slow tendency of rockfill materials strength growth is relatively small. While the crushing amount of rockfill materials with large deformation index increases significantly, and lead a relatively slow growth of rockfill strength. It is possible to obtain a larger peak strength even the deformation index of mother rock is low. Research conclusions indicate that the influence of mother rock on the mechanical properties of rockfill should be studied from two aspects of strength and deformation characteristics
更新日期/Last Update: 2020-07-29