狮子岭隧道下穿龙峰山庄别墅密集区爆破减震综合技术试验研究

发布时间：2018-11-27 13:52

【摘要】：针对山区多种立体交叉式隧道爆破减震和安全施工,以金温铁路狮子岭隧道工程为背景,开展了大断面、浅埋深、多干扰、多交叉的隧道安全快速施工技术研究,主要进行的工作及取得的研究成果如下:(1)在总结施工经验的基础上形成了一套隧道下穿既有建(构)筑物的安全快速施工技术以及对既有建(构)筑物的评判方法及原则。(2)针狮子岭隧道下穿龙峰山庄别墅密集区爆破施工的数值模拟分析表明,隧道在爆破开挖过程中围岩最大主应力一般出现在隧道拱腰和仰拱处,最小主应力一般出现在爆破面附近的拱腰拱脚处;同时,隧道塑性区主要集中在两侧拱肩,随着开挖的进行,塑性区由拱肩经拱腰向拱脚处扩散,开挖完成后塑性区主要集中在隧道两侧拱腰到拱脚区域,塑性区的范围与隧道跨度有关。(3)针对新建隧道爆破施工对上方既有建筑物的影响,研究提出的环形分层分段和水平分层分段爆破减震模型对于减少隧道爆破施工对地表既有建(构)筑物的扰动有着极大效果;在这种模型条件下,地表沉降受爆破开挖影响较小,说明爆破减震及加固设计发挥了极大的作用。(4)跟踪施工进行的爆破振动响应的实时监测表明,复杂的施工环境下环形分层分段和水平分层分段爆破减震模型,体现了减震和隔震双耦合的爆破减震设计理念,并达到了预期目标。
[Abstract]:In view of blasting shock absorption and safety construction of many kinds of intersecting tunnel in mountainous area, taking the Liangling tunnel project of Jinwen railway as the background, the safe and rapid construction technology of large section, shallow buried depth, multi-interference and multi-crossing tunnel is studied. The main work and research results are as follows: (1) on the basis of summing up the construction experience, a set of safe and rapid construction techniques for the existing construction (construction) under the tunnel and for the existing building (construction) are formed. (2) numerical simulation analysis of blasting construction in the dense area of Longfeng Villa under the Jishongling Tunnel shows that, In the course of blasting excavation, the maximum principal stress of surrounding rock appears in the arch and inverted arch of the tunnel, and the minimum principal stress usually occurs at the arch of the arch near the blasting surface. At the same time, the plastic zone of the tunnel is mainly concentrated on both sides of the arch shoulder. With the excavation, the plastic zone diffuses from the arch shoulder through the arch waist to the arch foot. After excavation, the plastic zone is mainly concentrated in the area from the arch waist to the arch foot on both sides of the tunnel. The range of plastic zone is related to the span of tunnel. (3) aiming at the influence of blasting construction on the existing buildings above the new tunnel, The proposed annular stratified and horizontal layered blasting damping models have great effect on reducing the disturbance of the existing building (construction) on the ground surface during the tunnel blasting construction. Under the condition of this model, the surface settlement is less affected by blasting excavation, which shows that blasting damping and reinforcement design play a great role. (4) Real-time monitoring of blasting vibration response following construction shows that, In the complex construction environment, the vibration absorption models of annular layered and horizontal layered blasting are presented, which embody the design concept of double coupling of shock absorption and isolation, and reach the expected goal.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.4

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