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在岩体内开挖大型硐室和隧道,需要掌握由于开挖引起的围岩位移场的变化,围岩变形(松动)范围,岩体内破裂装置和稳定状态等,以便合理选择喷锚支护形式及参数,确切评定硐室围岩的稳定性。一般进行现场岩体变形观测的主要手段是多点伸长计。国内现有多点伸长计的锚头采用机械支撑或是压缩木锚固结构,其锚固方式靠弹簧压紧或木质膨胀与孔壁接触,防震性能差,锚固力小。我们在西石门铁矿地下粗破碎硐室稳定性研究中,研制了一种锚
To excavate large chambers and tunnels in rock mass, it is necessary to grasp the change of surrounding rock displacement field, the deformation (looseness) range of rock mass, the rupture device in rock mass and the steady state due to excavation so as to reasonably choose the anchor bolt support Protection form and parameters, the exact assessment of the stability of rock chamber. Generally the main means of deformation observation of on-site rock mass is the multi-point extensometer. The existing multi-point extensometer anchor head with mechanical support or compression wood anchoring structure, the anchoring method by spring compression or wood expansion contact with the hole wall, shock resistance is poor, the anchoring force is small. In the study of the stability of coarse crushing chamber underground in Xishimen Iron Mine, we developed an anchor