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爆破与开挖瞬态卸荷双重动力扰动下岩溶隧道掌子面突水灾变机理研究

项目来源

国家自然科学基金(NSFC)

项目主持人

郭佳奇

项目受资助机构

河南理工大学

立项年度

2017

立项时间

未公开

项目编号

51778215

项目级别

国家级

研究期限

未知 / 未知

受资助金额

61.00万元

学科

工程与材料科学-建筑与土木工程-地下与隧道工程

学科代码

E-E08-E0808

基金类别

面上项目

关键词

失稳判据 ; 破裂演化 ; 双重动力扰动 ; 掌子面突水 ; 岩溶隧道 ; karst tunnel ; water inrush of tunnel face ; dual dynamic distrubance ; fracture evolution ; instability criterion

参与者

刘希亮；于建新；林志斌；陈峰宾；张勃阳；陈帆；贺振宇；檀俊坤

参与机构

河南理工大学

项目标书摘要：突水灾害已成为我国岩溶隧道建设的重大安全挑战。本项目以钻爆法施工的岩溶隧道掌子面突水为研究背景，认识到爆破和开挖瞬态卸荷双重动力扰动是掌子面突水的重要诱因。项目首先基于大量岩溶隧道掌子面突水案例的系统调查分析和归类统计，从岩体水力学角度归纳出掌子面防突岩体典型结构；其次，开展以防突岩体结构、岩溶水压、初始地应力、爆破开挖损伤程度为主控因素的掌子面突水物理模型试验，提出与防突岩体结构相对应的掌子面突水失稳模式，揭示防突岩体突水破坏的宏观机理。建立考虑爆破和瞬态卸荷耦合影响的三维离散元—计算流体力学动力模拟方法，从细观层面揭示工程动力扰动下掌子面破裂演化及突水通道形成过程与流态转换。然后依据模型试验和数值模拟结果，获取掌子面突水失稳临界特征信息，建立掌子面整体动力失稳判据及防突安全厚度分析方法。最后基于现场试验，对研究结论进行验证。研究成果对岩溶隧道突水灾害预警和防治具有重要意义。

Application Abstract: Water inrush has become a major security challenge in the construction of karst tunnel in China.This research is intended to take the frequent occurrence of water inrush for working face in karst tunnel excavated by the drilling and blasting method as the engineering background.it is found that dual dynamic disturbance induced by blasting and transient unloading of excavation is an important inducement to water inrush of tunnel face.Firstly,based on investigation analysis and classification statistics of massive cases of water inrush for karst tunnel face,the typical structures of rock mass to prevent water inrush ahead of tunnel face are concluded from the view of hydraulic properties of rock mass.Then,the model tests are carried out to present the instability styles of water inrush corresponding to the typical structures of rock mass ahead of tunnel face coupled by structures of water-resisting strata ahead of tunnel face,initial in-situ stress,karst water pressure and damage degree by blasting excavation.The macroscopic fracture mechanism of water inrush for rock mass in front of tunnel face base on results of physical model tests.3D DEM-CFD of dynamic simulation is established considering the coupling dynamic effect of blasting and transient unloading.The evolution law of rock mass in front of tunnel face fracture,the formation process of bursting water channel and flow state conversion are illustrated under the engineering disturbance from meso level by this numerical simulation method.Subsequently,the critical feature information of instability due to water inrush of tunnel face is achieved,meantime,the dynamic instability criterion and the method to determine water-resisting thickness of rock mass are built on the basis the results of model tests and numerical simulation.Eventually,the outcomes of theoretical research is verified by the field tests.Research results will devote to the early warning and preventive treatment for water inrush hazards of karst tunnel.for simulating water inrush of tunnel face

项目受资助省

河南省

项目结题报告(全文)

掌子面突水是一种致灾性极强的岩溶隧道地质灾害，因对其灾变机理认识不清导致难以有效遏制该类型灾害发生，造成严重的人员伤亡和经济损失。项目围绕钻爆法施工的岩溶隧掌子面突水灾变机理为这一核心科学问题，综合采用文献调研、理论分析、模型试验和数值模拟相结合的方法，从岩溶隧道掌子面防突岩体结构及失稳模式、掌子面防突岩体破裂演化及突水通道形成过程、掌子面防突岩体整体失稳判据与临突特征信息等方面开展了深入系统的研究。主要研究成果如下:(1)划分了岩溶隧道突水致灾构造类型，建立了岩溶隧道掌子面防突岩体大类—亚类—次亚类的分类方法，厘清了掌子面各典型防突岩体结构突水失稳模式及灾变过程；基于弹性厚板理论、断裂力学理论、关键块体理论及莫尔—库伦理论揭示了各典型结构掌子面防突岩体失稳机制。(2)分析了掌子面突水的爆破与开挖瞬态卸荷双重动态效应，建立爆破与地应力瞬态卸荷耦合作用下支裂纹尖端应力强度因子的计算方法，揭示了爆破和开挖瞬态卸荷触发防突岩体破裂失稳的力学机制。(3)开发了岩溶地层流固耦合相似材料，研制了融合开挖卸荷扰动效应和多元信息监测技术的岩溶隧道突水灾变演化模拟试验系统。(4)建立了综合考虑开挖卸荷扰动及高压岩溶水耦合影响的且能反映掌子面防突岩体突水破裂形成过程的三维离散元模拟分析方法。(5)基于物理模型试验和数值模拟结果，揭示了不同结构类型掌子面防突岩体突水通道动态形成过程及应力场、位移场、渗流场等多场变化规律，明晰了岩溶隧道掌子面突水不同阶段的水流转换特征。(6)获取了掌子面防突岩体整体失稳时应力、位移及渗压等物理量临突特征信息，揭示了岩溶隧道掌子面突水不同阶段的前兆信息特征，建立了典型结构防突岩体的整体失稳判据及最小防突安全厚度与临界水压力的分析方法；依据宜万铁路马鹿箐隧道和重庆市快速路一横线歇马隧道验证和完善了理论研究成果。研究成果对岩溶隧道掌子面突水灾害预警和防治具有重要意义。

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  • 1.Liquid CO2 Phase Change Fracturing and Vibration Monitoring in Roadbed Slope Excavation

    • 关键词：
    • Explosives;Cracks;Liquefied gases;Vibration analysis;Emulsification;Rocks;Spectrum analysis;Carbon dioxide;Blasting vibration signal;Emulsion explosives;Liquid carbon dioxide;Propagation distances;Surrounding environment;Vibration frequency;Vibration monitoring;Vibration velocity
    • Yuan, Hailiang;Chen, Chen;Yu, Jianxin;Liu, Xiaoyi;Dong, Bin
    • 《2021 International Conference on Internet of Things and Smart City, IoTSC 2021》
    • 2021年
    • June 4, 2021 - June 6, 2021
    • Kunming, Virtual, China
    • 会议

    In order to analyze the vibration impact of carbon dioxide fracturing tube blasting red sandstone, combined with the engineering conditions and surrounding environment of Anqing High-tech Zone, the rock-breaking blasting plan is carefully designed. The fracturing tube is arranged in two rows, the first row has 23 holes with a spacing of 1.5m, and the second batch of holes has 22 holes, which are arranged in a quincunx pattern with a distance of '1.3m between the front and rear rows. And design the corresponding vibration signal monitoring test to study the crack propagation caused by blasting, the attenuation law of vibration and its frequency spectrum distribution. The results show that after blasting, there is a relatively smooth crack in the plane area of the fracture zone 7m away from the critical surface. The width of the crack is between 20-40cm. The vibration velocity of the measuring point decays rapidly with the increase of the vibration source distance, and the vibration velocity decay curves in the X and Y directions are basically the same. Spectrum analysis shows that the main frequency band of each sub-velocity is generally below 100Hz, and the main vibration frequencies in the X and Y directions are concentrated in 30∼60Hz. The main vibration frequency band of the rock-breaking blasting vibration signal has little correlation with the direction and propagation distance of the vibration signal. And compared with the analysis of emulsion explosives, it is found that the particle vibration speed caused by the emulsion explosive rock-breaking blasting is much greater than that of the liquid CO2 fracturing tube rock-breaking blasting, indicating that the use of liquid carbon dioxide to break the rock can effectively reduce the vibration generated by blasting.
    © Published under licence by IOP Publishing Ltd.

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  • 2.Experimental research on cyclic impact load of concrete during curing period

    • 关键词：
    • Concretes;Curing;Compressive strength;Compressive strength of concrete;Concrete specimens;Drop weight impact;Experimental research;Longitudinal wave velocity;Positive correlations;Reduction in compressive strength;Uniaxial compressive strength
    • Chen, Chen;Xiaoyi, Liu;Jianxin, Yu;Pan, Liu;Min, Guo
    • 《2021 International Conference on Internet of Things and Smart City, IoTSC 2021》
    • 2021年
    • June 4, 2021 - June 6, 2021
    • Kunming, Virtual, China
    • 会议

    In order to study the influence of cyclic impact load on the compressive strength of concrete during the curing period, we used a self-made drop-weight impact test device to conduct a daily impact test on C40 concrete specimens with a curing period of 28 days. At the same time, the longitudinal wave velocity test of the test block before and after the impact was carried out, and the 28-day uniaxial compressive strength of the concrete test block was finally measured. The results show that the cyclic impact load during the curing period will cause internal damage to the concrete, and the uniaxial compressive strength is significantly reduced; the acoustic wave test results show that the damage of the concrete under the impact energy of 11.76kJ, 5.88kJ, 7.84kJ, and 8.82kJ is 0.035, 0.022, 0.031, 0.031. The uniaxial compressive strength values after 28 days decreased by 11.93, 4.68, 7.6, 10.23 MPa. There is a positive correlation between impact load, damage and reduction in compressive strength.
    © Published under licence by IOP Publishing Ltd.

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