Study on controlling methods for transient unloading inducing rock vibration due to blasting excavation of deep tunnels
YANG Jianhua1，WU Zenan1，JIANG Shuihua1，YAO Chi1，LU Wenbo2，ZHOU Chuangbing1
(1. School of Civil Engineering and Architecture，Nanchang University，Nanchang，Jiangxi 330031，China；2. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China)
Abstract：During blasting excavation of deep tunnels，the rapid in-situ stress release occurring on blast-created free surfaces is one of the major dynamic disturbances. For a deep circular tunnel which is excavated with the full-face millisecond-delay blasting method，the mechanism and influence factors of rock vibration induced by the transient unloading was analyzed，and vibration control methods were discussed in detail from the perspectives of cutting modes，blasthole arrangements and initiation sequences. The results show that properly designing drilling and blasting parameters can reduce initial stress levels on the excavation surfaces，prolong the duration of the transient unloading and reduce sizes of the excavation surfaces，and that，as a result，rock vibration induced by the transient unloading can be effectively controlled. The research work can be applied to blasting construction of deep tunnels in the industries of deep resource exploitation and deep space utilization.
杨建华1，吴泽南1，蒋水华1，姚 池1，卢文波2，周创兵1. 深埋隧洞爆破开挖地应力瞬态卸荷诱发围岩振动控制方法研究[J]. 岩石力学与工程学报, 2018, 37(12): 2751-2761.
YANG Jianhua1，WU Zenan1，JIANG Shuihua1，YAO Chi1，LU Wenbo2，ZHOU Chuangbing1. Study on controlling methods for transient unloading inducing rock vibration due to blasting excavation of deep tunnels. , 2018, 37(12): 2751-2761.
LI X B，CAO W Z，TAO M，et al. Influence of unloading disturbance on adjacent tunnels[J]. International Journal of Rock Mechanics and Mining Sciences，2016，84：10-24.
[8]
CAO W Z，LI X B，TAO M，et al. Vibrations induced by high initial stress release during underground excavations[J]. Tunnelling and Underground Space Technology，2016，53：78-95.
[5]
卢文波，杨建华，陈 明，等. 深埋隧洞岩体开挖瞬态卸荷机制及等效数值模拟[J]. 岩石力学与工程学报，2011，30(6)：1 089-1 096. (LU Wenbo，YANG Jianhua，CHEN Ming，et al. Mechanism and equivalent numerical simulation of transient release of excavation load for deep tunnel[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(6)：1 089-1 096.(in Chinese))
[15]
汪旭光. 爆破手册[M]. 北京：冶金工业出版社，2010：512-515.(WANG Xuguang. Handbook of blasting[M]. Beijing：Metallurgical Industry Press，2010：512-515.(in Chinese))
[17]
李夕兵，姚金蕊，宫凤强. 硬岩金属矿山深部开采中的动力学问题[J]. 中国有色金属学报，2011，21(10)：2 551-2 563.(LI Xibing，YAO Jinrui，GONG Fengqiang. Dynamic problems in deep exploitation of hard rock metal mines[J]. The Chinese Journal of Nonferrous Metals，2011，21(10)：2 551-2 563.(in Chinese))
[18]
李秀地，蒋树屏，刘元雪，等. 小净距新建隧道爆破对运营隧道的影响与控制[J]. 地下空间与工程学报，2016，12(6)：1 631-1 636. (LI Xiudi，JIANG Shuping，LIU Yuanxue，et al. Blasting effect and control of new tunnel with small clear space on existing operation tunnel[J]. Chinese Journal of Underground Space and Engineering，2016，12(6)：1 631-1 636.(in Chinese))
[2]
谢和平. “深部岩体力学与开采理论”研究构想与预期成果展望[J]. 工程科学与技术，2017，49(2)：1-16.(XIE Heping. Research framework and anticipated results of deep rock mechanics and mining theory[J]. Advanced Engineering Sciences，2017，49(2)：1-16.(in Chinese))
[4]
TOKSÖZ M N，KEHRER H H. Tectonic strain release by underground nuclear explosions and its effect on seismic discrimination[J]. Geophysical Journal International，1972，31(1/3)：141-161.
[6]
YANG J H，LU W B，JIANG Q H，et al. A study on the vibration frequency of blasting excavation in highly-stressed rock masses[J]. Rock Mechanics and Rock Engineering，2016，49(7)：2 825-2 843.
[10]
ZHU W C，WEI J，ZHAO J，et al. 2D numerical simulation on excavation damaged zone induced by dynamic stress redistribution[J]. Tunnelling and Underground Space Technology，2014，43(7)：315-326.
[12]
董春亮，赵光明，李英明，等. 深部圆形巷道开挖卸荷的围岩力学特征及破坏机理[J]. 采矿与安全工程学报，2017，34(3)：511- 518.(DONG Chunliang，ZHAO Guangming，LI Yingming，et al. Mechanical properties and failure mechanism of surrounding rocks in deep circular tunnel under excavation unloading[J]. Journal of Mining and Safety Engineering，2017，34(3)：511-518.(in Chinese))
[14]
MIKLOWITZ J. Plane-stress unloading waves emanating from a suddenly punched hole in a stretched elastic plate[J]. Journal of Applied Mechanics，1960，27(1)：165-171.
[16]
杨建华，姚 池，卢文波，等. 深埋隧洞钻爆开挖围岩振动频率特性研究[J]. 岩土力学，2017，38(4)：1 195-1 202.(YANG Jianhua，YAO Chi，LU Wenbo，et al. Vibration frequency characteristics of surrounding rock of deep tunnel induced by borehole-blasting[J]. Rock and Soil Mechanics，2017，38(4)：1 195-1 202.(in Chinese))
[1]
谢和平，高 峰，鞠 杨. 深部岩体力学研究与探索[J]. 岩石力学与工程学报，2015，34(11)：2 161-2 178.(XIE Heping，GAO Feng，JU Yang. Research and development of rock mechanics in deep ground engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(11)：2 161-2 178.(in Chinese))
[3]
CARTER J P，BOOKER J R. Sudden excavation of a long circular tunnel in elastic ground[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1990，27(2)：129-132.
[9]
周小平，毕 靖，钱七虎. 动态开挖卸荷条件下深埋圆形洞室各向同性围岩的分区破裂化机理[J]. 固体力学学报，2013，34(4)：352-360.(ZHOU Xiaoping，BI Jing，QIAN Qihu. The zonal disintegration mechanism of isotropic rock masses around a deep circular tunnel subjected to dynamic unloading[J]. Chinese Journal of Solid Mechanics，2013，34(4)：352-360.(in Chinese))
[11]
SAINOKI A，MITRI H S. Instantaneous stress release in fault surface asperities during mining-induced fault-slip[J]. Journal of Rock Mechanics and Geotechnical Engineering，2016，8(5)：619-628.
[13]
范鹏贤，李 颖，赵跃堂，等. 红砂岩卸载破坏强度特征试验研究[J]. 岩石力学与工程学报，2018，37(4)：852-861.(FAN Pengxian，LI Ying，ZHAO Yuetang，et al. Experimental study on unloading failure strength of red sandstone[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(4)：852-861.(in Chinese))
[19]
吴 亮，李 凤，卢文波，等. 爆破扰动下邻近层状围岩隧道的稳定性与振速阈值[J]. 爆炸与冲击，2017，37(2)：208-214.(WU Liang，LI Feng，LU Wenbo，et al. Vibration velocity threshold of a tunnel adjacent to surrounding layered rocks under blasting load[J]. Explosion and Shock Waves，2017，37(2)：208-214.(in Chinese))
2018, Vol. 37 
