单轴压缩条件下石灰岩的声发射试验及工程应用研究
2016-10-14聂刚陈俊智
聂刚 陈俊智
摘要: 运用TAW-2000B微机控制电液伺服岩石三轴试验机和SDAES数字声发射检测仪系统,在单轴压缩条件下,对石灰岩在应力-应变曲线全过程中不同阶段的声发射特征进行分析,通过试验研究对岩石应力-应变曲线不同阶段的声发射特征进行系统分析,在原岩开挖后,立即进行初喷混凝土等柔性支护,可以使围岩能够尽可能的变形,使其达到弹性变形的极限,开始出现塑性变形支护效果最好,能充分发挥围岩自身的稳定性,这对何时进行支护才能最大程度的发挥围岩自身的稳定性奠定理论基础。
Abstract: TAW-2000B computer control electro-hydraulic servo rock triaxial testing machine and SDAES digital acoustic emission detector system are used to analyze the acoustic emission characteristics of rock stress-strain curve in different stages under the condition of uniaxial compression. After original rock excavation, flexible support like initial shotcrete is done immediately, so that the surrounding rock can deform as much as possible and reach the limit of elastic deformation. The supporting effect is best if it begins to appear plastic deformation, thus the stability of the surrounding rock can be well played. This can lay a theoretical foundation for making decision on when to carry out support to give full play of the stability of the surrounding rock.
關键词: 岩石力学;声发射;支护;围岩稳定性;应力;应变
Key words: rock mechanics;sound emission;support;stability of surrounding rock;stress;distortion
中图分类号:TU458 文献标识码:A 文章编号:1006-4311(2016)05-0119-05
0 引言
随着矿业工程的日益发展,在建井施工到矿井生产的整个过程中,围岩支护作为一个分项工程,无论是在掘进立井、斜井、平硐、巷道、硐室等施工中都起着至关重要的作用。而围岩支护效果的好坏要从地应力、围岩自身稳定性、支护方式、支护材料、施工方式、验收体系等方面综合考虑。地应力主要由自重应力和构造应力组成,由于目前对地应力的理论与技术研究有限,只有自重应力能够计算出来,因此单纯运用地应力理论来进行分析,效果并不是很理想,有可能在数十米以外地应力的数值就大不一样,难以把握其中规律,而在其他因素中首要考虑的就是围岩自身稳定性,目前对于围岩稳定性的分析以声发射技术最为普遍。五十……
