基于岩爆碎屑研究的高楼山隧道岩爆机理分析与类型判定  被引量:3

Mechanism analysis and type determination of the rockburst of the Gaoloushan tunnel based on a study of rockburst fragments

在线阅读下载全文

作  者:孙晓明[1] 任超[1,2] 刘冬桥 何满潮[1] 杨金坤[1,2] 李志虎 朱嘉杰 袁俊超 齐振敏 SUN Xiao-ming;REN Chao;LIU Dong-qiao;HE Man-chao;YANG Jin-kun;LI Zhi-hu;ZHU Jia-jie;YUAN Jun-chao;QI Zhen-min(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Mechanical and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区:[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出  处:《工程科学学报》2023年第3期337-348,共12页Chinese Journal of Engineering

基  金:国家自然科学基金资助项目(52174096,52074299);甘肃省交通厅重点科研项目(u150154);中央高校基本科研业务费资助项目(2021JCCXSB03)。

摘  要:在建高楼山隧道是通达陇南市及四川省九寨沟的控制性工程,项目具有“三高一大”的特点,是复杂地质条件下深埋特长公路隧道的典型代表.以现场两种岩爆类型为研究对象,通过冲击岩爆实验系统并设定不同应力路径,首先进行了岩爆实验全过程分析,而后对比研究了板裂屈曲型岩爆实验碎屑(岩爆碎屑1)、爆破冲击型岩爆实验碎屑(岩爆碎屑2)和现场收集的不知类型的岩爆碎屑(岩爆碎屑3)的质量、尺度分布及形状分形维数特征.在此基础上,结合岩爆实验图像变化过程,深化了对不同类型岩爆碎屑成因及岩爆机理的认识.结果表明:(1)板裂屈曲型岩爆和爆破冲击型岩爆区别在于破坏主导机制不同,一种为张拉破坏主导,另一种为张剪破坏主导.(2)岩爆碎屑1以中粒、条板状碎屑为主,在长度方向上更容易破碎,且质量远大于岩爆碎屑2,这与竖向应力集中形成板裂化结构的板裂屈曲型岩爆孕育机制密不可分.(3)动载的介入使得岩爆碎屑2受剪切作用明显,因而在厚度方向的破碎更容易且破碎程度更高,形成以粗粒、片状碎屑为主的碎屑,该类型碎屑在现场岩爆中由于质量较大、体积较大、弹射距离较远,因此危害性可能更大.(4)通过上述比对分析,可基本判定岩爆碎屑3对应的岩爆类型为爆破冲击型,且片状、“V”形特征碎屑为该类型岩爆特有的碎屑类型.The Gaoloushan Tunnel is a control project for Longnan city and Jiuzhaigou,Sichuan Province.With the characteristics of"three high and one large,"this project is a typical representative of a deeply buried,long highway tunnel under complex geological conditions.In this dissertation,two types of rockburst in the field are taken as the research objects.By impacting a rockburstexperimental system and setting different stress paths, an image acquisition system recorded the entire process of impact rockburst and slab buckling rockburst in real time to analyze the characteristics of spalling and ejection. Rockburst due to static loading was performed and compared with rockburst caused by static loading + dynamic loading. Then, the quality, scale distribution, shape, and fractal dimension of slab buckling rockburst test fragments (rockburst fragments 1), impact rockburst test fragments (rockburst fragments 2), and unknown types of rockburst fragments (rockburst fragments 3) collected in the field were compared. On this basis, the image change process of the rockburst test was combined to deepen the understanding of the causes of different types of rockburst fragments and the rockburst mechanism. The results show that (1) slab-buckling rockburst and impact rockburst differ in the damage dominant mechanism, one being tension damage dominant, the other being tension-shear damage dominant. V-shaped and pan-shaped rockburst pit shapes are consistent with the on-site rockburst situation, which proves the rationality of this experiment. Slab-buckling rockburst has attenuation characteristics during the rockburst process, unlike the impact rockburst. From an analysis of debris ejection velocity and rockburst pit shape, impact rockburst is more severe than slab buckling rockburst. (2) Type 1 rockburst fragments are dominated by medium-grained slate fragments, which are more easily broken in the length direction and have a much larger mass than rockburst fragments 2, which is closely related to the incubation mechanism of slab bu

关 键 词:岩爆 岩爆碎屑 岩爆机理 类型判定 板裂屈曲型岩爆 爆破冲击型岩爆 

分 类 号:TU458[建筑科学—岩土工程]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象