摘要
为满足煤矿软岩巷道支护结构高强高韧的要求,改善素混凝土的脆性高韧性差问题,提出了将高韧性合成(粗)纤维与钢纤维混杂掺加到水泥基材料中形成复合水泥基材料,通过喷射工艺使这种复合材料在软岩巷道围岩表面形成一定厚度的喷层与锚杆、锚索等组成联合支护体,完成对软岩巷道支护的方法。通过实验室对选择的混杂合成(粗)纤维混凝土进行力学性能试验,混杂改性合成(粗)纤维增强增韧效果明显。同时对掺入的比例进行了优选。用FLAC有限差分程序计算的设计软件对初选的支护参数进行支护效果模拟验算和对支护参数进行了优化选择,经过3 a试验巷道的观测,素混凝土对比段已经出现开裂和脱落修护过一次,纤维混凝土试验段巷道依然完好,取得了很好的支护效果。
For high strength and toughness of coal soft rock roadway to support structure and improve mechanical characteristics of plane concrete,a kind of composite cement-based material,that added cement-based material to high toughness polypropylene（thick） fibers and high elastic modulus of steel fiber,was sprayed in the surrounding rock surface working with bolt and cable to form supporting community.And commendable supporting effect and optimal proportion of this composite material were acquired through soil mechanics performance test.During simulation checking and selection parameter of primary support by finite difference program FLAC,the plain concrete crackled and broke down,even got repaired while fiber concrete stayed the same,which showed preferable supporting effec after 3 years roadway test observation.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第12期1969-1974,共6页
Journal of China Coal Society
基金
建设部科研研究项目(08-K4-17)
关键词
合成(粗)纤维
软岩巷道
矿山压力
支护结构
modified polypropylene（thick） fibers
soft rock roadway
mine stress
supporting structures
