Research on Wall Rock Modified Hardening Technology of Grouting Material
zhang qi-zhong1; li guo-fu2; xu cheng-fu3; hao jing-di2(1.yongcheng coal-electricity group; yongcheng; 466700; china; 2.xuzhou institute of technology; xuzhou; 221008; china; 3.jiaozuo coal mining group; jiaozuo 454100; china)