为研究相似材料的合理养护时间、缩短物理相似模型试验周期、加快模型试验进度，对4种不同配比的胶结砂相似材料试件实施3种养护时间下的静态单轴压缩试验，并采用分离式Hopkinson压杆装置进行相应养护时间下的单轴冲击压缩试验。研究表明，随着相似材料中胶结材料水化反应的进行，4种配比胶结砂相似材料的静、动态单轴抗压强度和纵波波速均随养护时间的延长而增加；且7d到14d增长速率较快，14d到21d增长速率较慢，合理的模型材料养护时间为14d。在本次试验应变率条件下，胶结砂相似材料抗压强度动态增长因子和动态峰值应变随养护时间的延长而逐渐降低。砂灰比越小，相似材料中胶结材料越多，其静、动态单轴抗压强度越高，其抗压强度动态增长因子越小。
Abstract
In order to investigate the reasonable curing time of similar material, reduce the cycle time and accelerate the progress of physical similar model test, static uniaxial compression test was conducted for cemented sand similar material with 4 kinds of proportions in 3 kinds of curing times. Moreover, impact uniaxial compression test was also carried out by split Hopkinson pressure bar apparatus. The research shows that with the hydration reaction of cemented material in similar material proceeding, both static and dynamic uniaxial compressive strength for 4 kinds of cemented sand similar material increases with curing time growing. And the increase rate from 7d to 14d is fast, while the increase rate from 14d to 21d is slow. So the reasonable curing time for cemented sand similar material is 14d. Under the condition of test strain rate, both the dynamic increase factor for compressive strength and dynamic peak strain of cemented sand similar material decrease gradually with curing time growing. The smaller the sand-cement ratio, the more the cemented material in similar material is, then the bigger the static and dynamic uniaxial compressive strength is and the smaller the dynamic increase factor for compressive strength is.
关键词
相似材料 /
胶结砂 /
养护时间 /
分离式Hopkinson压杆(SHPB) /
抗压性能
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Key words
similar material /
cemented sand /
curing time /
split Hopkinson pressure bar(SHPB) /
compressive properties
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