采矿与安全工程学报2025，Vol.42Issue(2)：418-429,12.DOI:10.13545／j.cnki.jmse.2024.0208
风积沙胶结充填体力学特性与破坏特征研究
Study on mechanical properties and failure characteristics of cemented aeolian sand backfill
摘要
Abstract
The mechanical properties of cemented aeolian sand backfill(CASB)have an important in-fluence on the filling effect.These properties exhibit a size effect,and a layered structure tends to e-merge during the filling process.In this study,the mechanical properties of CASB were investigated from both internal factors(material ratio)and external factors(size and number of layers).In addition,the influence of the aeolian sand substitution ratio(the mass ratio of aeolian sand substituting for gangue)on the performance of gangue-aeolian sand cemented materials was analyzed.On the basis of substitution rate test,the response surface method(RSM)was employed to reveal the effects of cement content,ratio of fly ash to aeolian sand,and mass concentration on the strength of CASB from three lev-els of"single-factor action,two-factor interaction,and three-factor coupling".The results demonstrate that the strength of CASB increases with the enhancement of these three factors,in the interaction,the enhancement of one factor promotes the effect of another.The mechanical properties of CASB decreases as the height-width ratio and the number of layers grow.As the height-width ratio grows,the failure mode of CASB transitions from"multiple cracks"to"a single crack"and then to"no cracks penetrating the upper and lower surfaces of CASB",with cracks gradually concentrating in the middle and lower parts of CASB.CASB with a larger height-width ratio loses its load-bearing capacity under the action of cracks.For layered CASB,cracks first appear at the layered surface and then extends into the matrix on both sides of the interfaces.The findings of this study provide a theoretical basis and guidance for selec-ting reasonable material ratio and filling structures in the CASB process.关键词
风积沙充填/力学特性/破坏特征/尺寸效应/分层结构Key words
aeolian sand backfilling/mechanical properties/failure characteristics/size effect/layered structure分类
矿业与冶金引用本文复制引用
王树帅,杨仁树,李永亮,岳中文..风积沙胶结充填体力学特性与破坏特征研究[J].采矿与安全工程学报,2025,42(2):418-429,12.基金项目
国家自然科学基金面上项目(52174095) （52174095）
