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以湖北谷竹高速公路宴家炭质片岩隧道为依托,在现场布置了拱顶下沉、水平收敛、围岩接触压力、二衬压力监测设施,并进行监测和分析。结果表明:炭质片岩隧道的变形具有“随机性、突发性、持续性和不可预见性”的特点,具有时间和空间效应。施工中应严格遵循“短进尺、弱爆破、快支护、勤量测、强支护、早成环”的原则。宴家隧道采用新奥法设计和施工,实施监控量测是必要的。必须根据监控量测结果对衬砌支护参数和开挖方法及时进行调整。同时,验证了支护参数的必要性和合理性。
Relying on the carbonaceous schist tunnel of Guzhu Expressway in Hubei Province, the vault sinking, horizontal convergence, surrounding rock contact pressure and the second lining pressure monitoring facilities are arranged on the site and monitored and analyzed. The results show that the deformation of carbonaceous schist tunnel has the characteristics of “randomness, suddenness, continuity and unpredictability”, with time and space effect. Construction should strictly follow the “short footage, weak blasting, fast support, diligence measurement, strong support, as early as the ring” principle. Feast tunnel design and construction of the new Austrian law, the implementation of monitoring measurements are necessary. The lining support parameters and excavation methods must be adjusted in time according to the monitoring and measuring results. At the same time, the necessity and rationality of support parameters are verified.