Deformation and failure mechanism of large cross-section semi coal rock roadway and control technology
Aiming at the difficulty of surrounding rock deformation control in large section semi coal rock roadway,taking the Xiaobaodang No.1 Mine as the research background,the distribution of rock layers,in-situ stress distribution,and crack development in the surrounding rock of the roadway were tested,and the deformation and failure evolution characteristics of the roadway surrounding rock were analyzed.Through laboratory experiments and numerical simulations,the mechanical properties and deformation failure forms of semi coal rock composite were analyzed.It was revealed that the coal with lower strength first ruptured and slid at the coal rock interface,and the deformation continued to extend deeper.As the integrity and strength of the coal rock mass continued to weaken,non-uniform and progressive instability failure of the roadway was caused from bottom to top.The key to improving the stability of surrounding rock in large cross-section semi coal rock roadway is to control the non coordinated deformation of the coal rock interface.Based on this,a deformation control concept of using high prestressed anchor support and strengthening support in weak areas was proposed.And the deformation control plan for the surrounding rock of the semi coal rock roadway in the large section of Xiaobaodang No.1 mine was developed,and underground industrial experiments were conducted,achieving good application results.During the monitoring period,the displacement of the roadway roof was 28 mm,the displacement of the two sides was 80mm,and the displacement of the bottom plate was 43 mm.Subsequently,the deformation of the surrounding rock stabilized,the deformation control effect at the intersection of coal and rock in the roadway is significant,indicating that this scheme can effectively control the surrounding rock deformation in large cross-section semi coal rock roadway.
large section roadwaysemi coal rock roadwayhigh prestressed supportcoal rock combination
NETL
NSTL
万方数据
