【作者】 齐宝健；

【导师】 林登阁；

【作者基本信息】 山东科技大学 ， 岩土工程， 2009， 硕士

【摘要】 深井高应力软岩巷道支护一直是国内外地下工程支护的难题之一。随着开采深度的增加,地质环境的复杂,导致突发性工程灾害和重大恶性事故增加、作业环境恶化、生产成本急剧加大,巷道围岩体表现出明显的大变形、高应力、长时间持续蠕变的特性,对深部资源开采过程中的工程支护提出了严峻的挑战。因此研究深井高应力软岩巷道的合理支护技术具有非常重要的现实意义。论文通过运用理论分析,数值模拟,现场试验监测相结合的方法,研究了能较好的发挥支护承载能力和围岩自承载能力的锚注支护形式,并运用粘弹性和粘塑性理论计算分析了巷道围岩粘弹性区和粘塑性区应力、应变状况,得出了支护抗力与塑性区半径的变化关系。针对郭屯煤矿深部围岩表现出的大变形、高应力、长时间蠕变的特征,按照“抗-卸-固”支护原则,提出了一次锚网索喷支护+二次锚注控制蠕变支护方案,建立了一次锚杆或锚索支护弹塑性和二次锚杆及注浆加固支护的粘塑性力学模型,确定合理的一次锚杆支护强度和二次锚注控制蠕变变形的条件。论文应用显式有限差分程序FLAC3D对泵房的支护方式进行了数值模拟,包括泵房内岩体立即开挖、一次锚网索支护、二次锚注支护等几种支护方案,通过对几种支护方式下围岩的应力、变形、塑性区的发展等方面支护效果的对比,验证了锚注支护在保持围岩稳定性方面的作用。更多还原

【Abstract】 Supporting technique in deep-seated high stressed soft rock roadway is always one of the puzzles in underground engineering field at home and abroad. With increasing of exploit depth, complexity of environment, burst casualty and heavy accidents are more frequent, work environment is more formidable, cost of production is rising rapidly, surrounding rock of roadway weirdness obvious large deformation, high stress, long duration of creep properties, which challenge the supporting engineering in the deep-seated resource exploit. Therefore, it is very important and meaningful to study proper supporting technique in deep-seated high stressed soft rock roadway.This article makes use of the method that associates with theoretical analysis, numerical simulation and local testing, study the supporting form of bolt and grouting which can play a great bring support bearing capacity and surrounding self-bearing capacity, and using visco-elastic and visco-plastic theory calculate and analysis the stress and strain of visco-elastic area and visco-plastic area of the surrounding rock, with the changing relationship between support force and the plastic zone radius.According to the large deformation, high stress, long time creep characteristics that is showing by deep rock of GuoTun Mine, according to "resist-release-reinforce" supporting principle, put forward the first support with bolting, netting, anchoring and the second support of grouting-bolt which control the ceep,and bulid mechanics model with fist bolt or cable support elastoplastic and grouting-bolt support t visco-plastic. Note the reasonable conditions that control creepdeformation with frist bolt and secondary grouting-bolt supporting.This paper used the finite-difference program FLAC3D to simulate supporting methods in the pump room including excavation in pump room without supporting, the first support with bolting, netting, anchoring and the second support of grouting-bolt, via comparing a few of the supporting effect on stress, deformation, plastic zone development and so on in the surrounding rock, proved the effect of anchor-grouting on keeping the surrounding rock steady.更多还原