基于特征应力点提出围岩爆破前后损伤比例公式
发布时间：2019-03-06 19:02
【摘要】：目前大多数隧道采用的是爆破掘进,炸药爆炸后的冲击应力会对隧道围岩造成不同程度的损伤。隧道围岩的损伤积累会降低围岩强度进而会影响岩体稳定性。岩石的破坏过程在微观上是内部缺陷微裂隙发展、传播、贯通,但岩石的内部微裂隙损伤难于直观观测。笔者通过室内岩石三轴压缩破坏试验和声发射特征试验所获得岩石加载过程的特征应力点判断岩石内部微裂隙发展阶段。特征应力点有裂隙初始应力—原岩损伤强度、爆破应力—凯塞点强度、裂隙贯通应力(长期强度)—原岩强度、抗压峰值强度。基于对围岩破坏过程的特征应力点的研究,提出了围岩爆破前后的损伤比例公式,量化了隧道爆破后围岩相对于原岩的损伤程度。
[Abstract]:At present, most tunnels are driven by blasting, and the impact stress after explosive explosion will cause damage to the surrounding rock of the tunnel in varying degrees. The damage accumulation of tunnel surrounding rock will reduce the strength of surrounding rock and then affect the stability of rock mass. The failure process of rock is the development, propagation and penetration of internal defects in micro-cracks, but the damage of micro-cracks in rock is difficult to be observed intuitively. The development stage of micro-cracks in rock is judged by the characteristic stress points of rock loading process obtained from the laboratory triaxial compression failure test and acoustic emission characteristic test. The characteristic stress points are crack initial stress-original rock damage strength, blasting stress-Kessel point strength, fracture through stress (long-term strength)-original rock strength, peak compressive strength. Based on the study of the characteristic stress points in the process of surrounding rock failure, the damage proportion formula before and after blasting is put forward, and the damage degree of surrounding rock relative to the original rock after tunnel blasting is quantified.
【作者单位】： 北京科技大学土木与资源工程学院;
【基金】：国家重点研发计划项目资助(2016YFC0600703)
【分类号】：U451.2;U455.6
本文编号：2435809
[Abstract]:At present, most tunnels are driven by blasting, and the impact stress after explosive explosion will cause damage to the surrounding rock of the tunnel in varying degrees. The damage accumulation of tunnel surrounding rock will reduce the strength of surrounding rock and then affect the stability of rock mass. The failure process of rock is the development, propagation and penetration of internal defects in micro-cracks, but the damage of micro-cracks in rock is difficult to be observed intuitively. The development stage of micro-cracks in rock is judged by the characteristic stress points of rock loading process obtained from the laboratory triaxial compression failure test and acoustic emission characteristic test. The characteristic stress points are crack initial stress-original rock damage strength, blasting stress-Kessel point strength, fracture through stress (long-term strength)-original rock strength, peak compressive strength. Based on the study of the characteristic stress points in the process of surrounding rock failure, the damage proportion formula before and after blasting is put forward, and the damage degree of surrounding rock relative to the original rock after tunnel blasting is quantified.
【作者单位】： 北京科技大学土木与资源工程学院;
【基金】：国家重点研发计划项目资助(2016YFC0600703)
【分类号】：U451.2;U455.6
【相似文献】
相关期刊论文 前1条
1 张效松;拉压杆件有限元最佳应力点问题[J];力学与实践;2001年05期
，本文编号：2435809
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2435809.html
