建筑垃圾基充填体胶结特征及力学性能分析
ANALYSIS OF MECHANICAL CHARACTERISTICS AND CEMENTATION PROPERTIES ON CONSTRUCTION WASTE FILLING SPECIMENS
姬红英 1李焕 2张东营 3高忠国 3李建林 2辛亚军4
作者信息
- 1. 河南理工大学资源环境学院,河南焦作 454000;煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作 454000
- 2. 河南理工大学资源环境学院,河南焦作 454000
- 3. 黔西金坡煤业有限公司,贵州毕节 551700
- 4. 河南理工大学能源科学与工程学院,河南焦作 454000
- 折叠
摘要
利用建筑垃圾进行煤矿采空区充填是控制地表沉陷、实现建筑垃圾资源化、减少土地占有面积的有效途径.通过对4组共12个不同水泥掺量建筑垃圾充填体表面孔洞分数计算及单轴抗压强度试验,分析了水泥掺量与充填体孔洞分数关系,探讨了水泥掺量与抗压强度、峰值应变、弹性模量的关系,提出了充填体破坏失稳模式,确定了充填体峰值强度、强度合理区间及快速提升的水泥掺量范围.结果表明:充填体孔洞分数与水泥掺量呈负相关,水泥掺量对充填体应力-应变曲线形态影响较大,水泥掺量为15％时,应力-应变曲线四阶段特征显著,水泥掺量越大(孔洞分数越少),弹性阶段越长,反之屈服阶段越长;随着水泥掺量增加(孔洞分数减小),充填体强度与弹性模量呈三次多项式增加趋势,轴向应变呈减小趋势且变缓趋于稳定;水泥掺量＜10％时,充填体失稳为多裂纹粉碎性破坏,水泥掺量为10％～15％时,为双侧反拱剪切破坏,水泥掺量＞15％时,为双侧垂直劈裂破坏;矿山建筑垃圾充填体在水泥掺量为7％～20％范围内,充填体强度为2.3647～15.7341 MPa,水泥掺量为18.6991％时,存在充填体强度峰值,充填体28 d强度提升是10 d强度的1.24倍.
Abstract
It is an effective way to control surface subsidence,realize construction waste resources,reduce land occupation area to fill the coal goaf using construction waste.Uniaxial compression mechanics tests and surface hole fraction calculation were produced on 4 groups of 12 construction waste specimens with different cement content.The relationship between cement content and hole fraction was analyzed,the relationships of cement content and compressive strength,peak strain,and elastic modulus were discussed,failure instability modes of specimens were put forward,and the cement content range of filling specimens for peak strength,the strength reasonable range and rapid strength improvement were determined.The results showed that hole fraction and cement content had an antiphase relationship,cement content had a great influence on the stress-strain curve of filling specimens,the four-phase characteristics of the stress-strain curve was significant at cement content 15％,the greater cement content(the less hole fraction),the longer the elastic phase,conversely,the longer the yield phase.As cement content increased(hole fraction decreased),the strength and elastic modulus of filling specimens were increased according to cubic polynomial,and the axial strain showed decreasing,slow,trend to stable.The instability mode of filling specimens with less than 10％cement content was a multi-crack crushing failure,the one with 10％to 15％showed double back-arch shear failure,and the one with more than 15％showed double vertical splitting failure.The cement content range of the construction waste filling body was 7％to 20％according to mine requirements,the strength range 2.3647 to 15.7341 MPa,the peak strength of the filling specimen appeared at the cement content of 18.6991％,and the strength of filling specimens on the 28th day was 1.24 times on the 10th day.
关键词
建筑垃圾/充填试件/水泥结料/孔洞分数/力学特性/失稳机制Key words
construction waste/filling specimen/cement materials/hole fraction/mechanical characteristics/instability mechanism引用本文复制引用
基金项目
国家自然科学基金(51374091)
河南省高等学校重点科研项目(22A170009)
河南省创新型科技人才队伍建设工程项目(CXTD2016053)
河南省科技攻关计划(232102320253)
出版年
2024
NETL
NSTL
万方数据