双碑隧道钻爆施工及震动监测技术研究
发布时间：2019-01-02 08:28
【摘要】：得益于国家大力投资交通基础设施建设,交通隧道的发展突飞猛进,隧道施工正面临着严峻的考验,许多问题急需解决。本文以重庆双碑隧道为工程背景,研究了大断面软弱围岩隧道掘进过程中洞口施工技术、洞身开挖爆破方案优化、爆破振动检测及环境问题的防护。洞口段施工历来是隧道施工的重点、难点,保证安全进洞是隧道施工的开端。与其他区段相比,洞口段有着自身的特点,隧道洞口段围岩风化情况一般较重,洞口的衬砌经常存在严重的浅埋偏压现象。考虑到隧道进口洞口地质较差,双碑隧道在洞口施工中采用先支后挖法施工。在修建洞身时,为了使围岩的自承能力得到足够利用,需要降低爆破对围岩的震动。根据双碑隧道施工的要求,对双碑隧道开挖爆破方案进行了优化,对各类围岩有1.2m、2.0m、2.5m和3.0m循环进尺方案。优化爆破方案后,爆破振动监测结果显示,爆破振速降低了约75%,方案优化效果明显。开挖过程中,对隧道施工爆破振动进行了检测。分别在隧道附近进、出口段的掌子面正上方、邻近的民房、附近不良地质区、渝生厂等地点共布置了 8个监测点。此外,当隧道掌子面接近铁路时,对铁路进行了监测。由于双碑隧道附近存在铁路、学校以及居民区等,对于洞口飞石、冲击波、噪音、灰尘等环境问题的防护也进行了相应研究。通过以上研究,希望能对大断面软弱围岩条件下隧道施工提供参考。
[Abstract]:Thanks to the national investment in transportation infrastructure construction and the rapid development of traffic tunnels, tunnel construction is facing a severe test, many problems need to be solved. Taking Chongqing Shuangbei Tunnel as the engineering background, this paper studies the construction technology of the hole, the optimization of blasting scheme, the detection of blasting vibration and the protection of environmental problems in the tunneling process of large-section soft surrounding rock tunnel. The construction of tunnel entrance section is always the key and difficult point of tunnel construction, so it is the beginning of tunnel construction to ensure safe entry. Compared with other sections, the tunnel entrance section has its own characteristics, the surrounding rock weathering of tunnel entrance section is generally heavier, and the tunnel lining often has serious phenomenon of shallow burying bias. Considering the poor geology of the entrance of the tunnel, Shuangbei tunnel is constructed by the method of first supporting and then digging. In order to make enough use of the bearing capacity of surrounding rock, the vibration caused by blasting should be reduced. According to the requirements of double tablet tunnel construction, the excavation blasting scheme of double tablet tunnel is optimized, and there are 1.2 m and 2.0 m 2.5 m and 3.0 m circular advance schemes for all kinds of surrounding rock. The results of blasting vibration monitoring show that the blasting vibration velocity has been reduced by about 75%, and the optimization effect is obvious. In the course of excavation, the blasting vibration of tunnel construction is detected. Eight monitoring points were arranged in the entrance and exit section of the tunnel directly above the face of the palm, the adjacent houses, the nearby unfavorable geological area and the Yusheng factory, etc. In addition, the railway is monitored when the tunnel face is close to the railway. Due to the existence of railways, schools and residential areas in the vicinity of the tunnel, the protection of flying stone, shock wave, noise, dust and other environmental problems at the entrance of the tunnel is also studied. Through the above research, we hope to provide a reference for tunnel construction under the condition of large section soft surrounding rock.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.4
本文编号：2398262
[Abstract]:Thanks to the national investment in transportation infrastructure construction and the rapid development of traffic tunnels, tunnel construction is facing a severe test, many problems need to be solved. Taking Chongqing Shuangbei Tunnel as the engineering background, this paper studies the construction technology of the hole, the optimization of blasting scheme, the detection of blasting vibration and the protection of environmental problems in the tunneling process of large-section soft surrounding rock tunnel. The construction of tunnel entrance section is always the key and difficult point of tunnel construction, so it is the beginning of tunnel construction to ensure safe entry. Compared with other sections, the tunnel entrance section has its own characteristics, the surrounding rock weathering of tunnel entrance section is generally heavier, and the tunnel lining often has serious phenomenon of shallow burying bias. Considering the poor geology of the entrance of the tunnel, Shuangbei tunnel is constructed by the method of first supporting and then digging. In order to make enough use of the bearing capacity of surrounding rock, the vibration caused by blasting should be reduced. According to the requirements of double tablet tunnel construction, the excavation blasting scheme of double tablet tunnel is optimized, and there are 1.2 m and 2.0 m 2.5 m and 3.0 m circular advance schemes for all kinds of surrounding rock. The results of blasting vibration monitoring show that the blasting vibration velocity has been reduced by about 75%, and the optimization effect is obvious. In the course of excavation, the blasting vibration of tunnel construction is detected. Eight monitoring points were arranged in the entrance and exit section of the tunnel directly above the face of the palm, the adjacent houses, the nearby unfavorable geological area and the Yusheng factory, etc. In addition, the railway is monitored when the tunnel face is close to the railway. Due to the existence of railways, schools and residential areas in the vicinity of the tunnel, the protection of flying stone, shock wave, noise, dust and other environmental problems at the entrance of the tunnel is also studied. Through the above research, we hope to provide a reference for tunnel construction under the condition of large section soft surrounding rock.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.4
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