采矿与安全工程学报2015，Vol.32Issue(4)：537-543,7.DOI:10.13545/j.cnki.jmse.2015.04.003
早强混凝土实验与极软岩巷道钢管混凝土支架应用研究
Early strength concrete experiment and applied research of early strength concrete-filled steel tubular supports in extremely soft rock roadways
摘要
Abstract
When ordinary concrete-filled steel tubular supports (CFST supports) are used in extremely soft rock roadway, they are likely to be destroyed before the core concrete forms a larger strength. To solve this problem, the mixing experiment of early strength concrete has been carried out at first and then researchers have developed the early strength CFST supports based on previous experimental re-sults. Further more, early supporting counter-force of early strength CFST supports and ordinary CFST supports have been contrastively analyzed by using theoretical calculation. At last, composite supports scheme based on early strength CFST supports has been designed and simulated with Beizao mine roof roadway as the engineering background, which has been used in engineering practice ultimately. Re-search results have indicated that the initial slump surpasses 220 mm, and the retarding time surpasses 3 h, and its 1 d compressive strength after final set surpasses 40 MPa, and that 3 d compressive strength surpasses 49.9 MPa,which have met pumping and early strength requirements; the 1 d,3 d and 7 d supporting counter-force of early strength CFST supports are 1.68 times,1.4 times and 1.26 times of the ordinary CFST supports, and it can still grow slowly in the late stage; numerical simulation and engi-neering application have sufficiently proved that the composite supports based on early strength CFST supports can effectively inhibit the convergence deformation of the extremely soft rock roadway in the early time and ensure the long-term stability of the roadway.关键词
钢管混凝土支架/极软岩巷道/早强混凝土/配合比/复合支护Key words
concrete-filled steel tubular supports (CFST supports)/extremely soft rock roadway/early strength concrete/mix proportion/composite support分类
矿业与冶金引用本文复制引用
高延法,刘珂铭,冯绍伟,赵伟,曲广龙,谢浩..早强混凝土实验与极软岩巷道钢管混凝土支架应用研究[J].采矿与安全工程学报,2015,32(4):537-543,7.基金项目
国家自然科学基金项目(51474218,51134025) （51474218,51134025）
