P波作用下机场跑道的爆破安全振动速度研究  

Study on Safety Blasting Vibration Velocity for Concrete Airport Runway Subjected to P-Waves

作　　者：胡守云[1] 周传波[1] 蒋楠[1] 路世伟 张震[1] 何如[1] HUShouyun ZHOU Chuanbo JIANG Nan LU Shiwei ZHANG Zhen HE Ru(Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《华南理工大学学报（自然科学版）》2018年第4期129-136,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41372312);黄鹤英才(科技)计划项目(2015055003)~~

摘　　要：结合湖北省首例下穿机场跑道隧道钻爆法开挖工程背景,基于理论解析、数值模拟与现场监测相结合的研究方法,分析了下穿隧道爆破产生的入射P波对混凝土跑道的作用机理,研究了机场跑道的隧道爆破振动安全判据.结果表明:下穿跑道隧道爆破振动作用下,岩石与混凝土跑道交界面以拉伸破坏为主;随着入射P波入射角的增大,机场跑道的爆破安全振动速度呈现先增大后减小的趋势,其最小值出现在入射角为零时(即垂直入射的情况),表明爆破地震波垂直入射时机场跑道最容易发生破坏;基于机场跑道的重要性,选取1.7为重要性修正系数,依据爆破地震波以不同角度入射时确定的爆破安全振动速度,得到修正后的爆破安全振动速度在3.67~7.91 cm/s之间;与数值模拟和回归分析结果相比,由于应力波理论分析忽略了材料塑性变形的影响,其计算分析得到的爆破安全振动速度更小,具有更高的安全储备.On basis of the first tunnel project adopting drilling and blasting method under an existing airport runways in Hubei Province in combination with the theoretical analysis of stress wave theoiy, numerical simulation and field monitoring, the interaction between an incident P-wave and the airport runway is discussed and the blasting vibration safety criterion for aiiport mnway is established, of which the feasibility and the reliability are validated by a practical engineering case. Results show that ： the blasting vibration safety criterion ( BVSC) determined by shear failure criterion is much greater than that detemiined by tensile failure criterion, indicating that tensile failure dominates the failure type of the interface； when the incident angle increases, the BVSC increases first, then decreases. And the minimum BVSC occurs in the case of normal incidence, which indicates that the case of normal incidence is the most dangerous； taking into account the importance of airport runway, 1.7 is chosen as the modifying coeffi-cient and the BVSC of 3. 67 ?7. 91 cm/s is determined according to the different incident angles merical simulations, the BVSC obtained by theoretical analysis has a higher safety reserve.

关 键 词：隧道掘进 爆破振动 安全振动速度 入射P波 混凝土跑道 

分 类 号：O383[理学—流体力学] U455.6[理学—力学]