摘要
针对松散软岩胶结程度差、松散易碎及岩层粒状力学行为明显的特性,引入粒状材料的概念对松散软岩巷道失稳机理进行研究。在粒状材料力学行为分析的基础上,获得了粒状材料库仑屈服准则,并结合某矿现场情况建立了松散软岩巷道力学模型,获得了其围岩塑性区半径扩展公式。通过分析得出:巷道围岩塑性区半径随着初始支护强度与原始地应力比值的增加逐渐减小,但塑性区范围仍然很大。因而仅仅通过提高巷道初始支护强度并不能有效控制该类巷道围岩塑性区的扩展,还需改善围岩物理力学性能,提高支护结构的承载能力。针对该矿区具体情况提出了"超前预注浆+锚网棚+锚注"联合支护方案,取得了良好成效,保证了施工的顺利进行。
In response to the poor cementation condition of loose soft rock roadway and obvious fea-tures of layers of granular mechanical behavior, this paper has introduced granular material to study the instability mechanism of loose soft rock roadway. Based on the analysis of static mechanical behavior of granular materials,the research has obtained Coulomb Yield Criterion of granular material;combined with the present specific situations of a certain mine field, the roadway supporting mechanical model has been constructed and surrounding rock plastic zone extension formula under the poor cemented geological conditions has been obtained. By analyzing the results, this paper has shown that the road-way plastic zone radius decreases as the ratio of the strength of initial support and the primitive stress increases;but the plastic zone is still very large. So only by raising the strength of initial support of the roadway can we control the expansion of such roadway plastic zone effectively, and it also needs to im-prove the physical and mechanical rock properties and increase the carrying capacity of supporting structure. As a result, the“pre-grouting＋anchor net shed＋bolt-grouting”united supporting scheme has been proposed, which has achieved good efficiency and ensured the smooth construction process.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2015年第3期433-438,共6页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2014CB046905)
国家自然科学基金项目(51274191,51204159)
教育部博士点基金项目(20130095110018)
关键词
粒状材料
松散软岩
塑性区
注浆
联合支护
granular material
loose soft rock
plastic zone
grouting
united supporting
