水灰比对钻孔护孔泡沫混凝土性能影响研究  

Effect of Water-to-Cement Ratio on the Properties of Foam Oncrete for Drill Hole Protection

作　　者：凌伟[1,2] 刘超 杨坦[3,4] LING Wei;LIU Chao;YANG Tan(Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an,China 710054;College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an,China 710054;Key Laboratory of Building Structure of Anhui Higher Education Institutes,Anhui Xinhua University,Hefei,China 230088;State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei,China 230026)

机构地区：[1]教育部西部矿井开采及灾害防治重点实验室,陕西西安710054 [2]西安科技大学安全与科学工程学院,陕西西安710054 [3]安徽新华学院建筑结构安徽省普通高校重点实验室,安徽合肥230088 [4]中国科技大学火灾科学国家重点实验室,安徽合肥230026

出　　处：《温州大学学报（自然科学版）》2020年第4期49-54,共6页Journal of Wenzhou University(Natural Science Edition)

基　　金：国家自然科学基金项目(51674189,51874233);建筑结构安徽省普通高校重点实验室(安徽新华学院)开放研究项目(KLBSZD201904)。

摘　　要：为了解决松软煤层钻孔易塌孔的问题,从利用泡沫混凝土支护钻孔孔壁角度,以5组不同水灰比为试验变量,研究了水灰比对泡沫混凝土性能的影响,分析了水灰比与泡沫混凝土抗压强度和连通孔隙率之间的关系.结果表明:改变水灰比对泡沫混凝土的抗压强度和孔隙率均有较大影响,随着水灰比的降低,抗压强度和孔隙率均呈增加趋势,其中水灰比为1.5时三天抗压强度为0.58 MPa、连通孔隙率为47.66%;水灰比为0.5时三天抗压强度为2.27 MPa、连通孔隙率为59.81%.对比各组试验,发现钻孔护孔泡沫混凝土的最佳水灰比为0.5.In order to solve the problem of hole collapse in soft coal seam,this paper,from the view of foam concrete as the support materials for drill holes,set up five different water-to-cement ratios as experimental variables to study the effect of water-to-cement ratio on the properties of foam concrete and analyze the relations between the water-to-cement ratio and the compressive strength and the connected porosity of foam concrete.The results showed that changing the water-to-cement ratio has a great impact on the compressive strength and connected porosity of foam concrete.Compressive strength and connected porosity increase as the water-to-cement ratio decreases.When the water-to-cement ratio is 1.5,compressive strength in three day maintenance period and connected porosity are 0.58 MPa and 47.66%respectively;when the water-to-cement ratio is 0.5,compressive strength in three day maintenance period and connected porosity are 2.27MPa and 59.81%respectively.A comparison of different groups showed that the optimal water-to-cement ratio of foam concrete for drill holes is 0.5.

关 键 词：钻孔护孔 泡沫混凝土 抗压强度 连通孔隙率 

分 类 号：TU528.55[建筑科学—建筑技术科学]