爆炸平面波下锚杆对洞室加固效果模型试验方法

doi:10.3969/j.issn.1000-1093.2020.12.013

摘要/Abstract

摘要： 为探索爆炸平面波下锚杆对洞室的加固效果，通过抗爆模型试验，从围岩应力、洞壁环向应变、加速度和顶底板相对位移4个方面，研究爆炸平面波作用下毛洞和2种锚杆对洞室的加固效果。分析爆炸平面波强度沿着垂直方向和水平方向的衰减规律；比较毛洞、全长粘结式锚杆加固洞室和自由式锚杆加固洞室的洞壁环向应变、加速度、顶底板相对位移之间的差异。结果表明：爆炸平面波强度沿垂直方向的衰减速度比水平方向的慢；每个洞室内拱顶处的加速度和抗变形能力最大，底板的加速度最小；拱脚是洞室中极易产生拉应变的地方，锚杆加固能使拱脚围岩由受拉变形改变为受压变形；全长粘结式锚杆加固的洞室拱顶和底板都产生了相对较大加速度，但在减小洞室拱部变形、顶底板相对位移和侧墙加速度方面的作用大于自由式锚杆。

关键词: 锚杆, 爆炸平面波, 洞室, 模型试验, 加固效果

Abstract: The cavern unreinforcement and reinforcement effects of two kinds of rock bolts to the caverns under the explosive plane wave loading are studied from four aspects, i.e., surrounding rock stress， circumferential strain and acceleration of cavern wall, and roof-to-floor relative displacement, through antiexplosion model test. The intensity attenuation laws of explosive plane waves along vertical and horizontal directions are analyzed. The differences of the circumferential strain and accelerations of cavern wall，and the roof-to-floor relative displacement are compared for the unreinforced cavern, and the caverns reinforced by the full-length bonded rock bolts and the non-full-length bonded rock bolts. The results indicate that the intensity attenuation speed of explosive plane wave in vertical direction is slower than that in horizontal direction. The acceleration and deformation resistance of the arch roof are the largest and the acceleration of the floor is the smallest in each cavern. Arch foot is a place where the tensile strain is very easy to occur in caverns. The reinforcement of rock bolts can change the tensile deformation of surrounding rock of arch foot to compression deformation. The arch roof and floor of cavern reinforced by the full-length bonded rock bolts produce relatively large accelerations. However， the full-length bonded rock bolts are better than the non-full-length bonded rock bolts in some aspects, such as reducing the deformation of arch， the roof-to-floor relative displacement and the acceleration of side wall.

Key words: rockbolt, explosiveplanewave, cavern, modeltest, reinforcementeffect

中图分类号:

O383⁺.1

杨自友, 吴德义, 徐景茂. 爆炸平面波下锚杆对洞室加固效果模型试验方法[J]. 兵工学报, 2020, 41(12): 2478-2485.

YANG Ziyou, WU Deyi, XU Jingmao. Model Test Method of Reinforcement Effects of Rock Bolts to Caverns under Explosive Plane Wave Loading[J]. Acta Armamentarii, 2020, 41(12): 2478-2485.

参考文献

［1］沈俊，张向阳，陈安敏，等.爆炸应力波在洞室围岩中的分布及洞库稳定性研究［J］.现代隧道技术，2014，51(5):55-60.
SHEN J，ZHANG X Y，CHEN A M，et al.Distribution of an explosive stress wave in surrounding rock and the relevant stability of an underground cavern［J］.Modern Tunnelling Technology，2014，51(5): 55-60.(in Chinese)
［2］徐景茂，顾金才，陈安敏，等.锚杆长度和间距对洞室抗爆性能影响研究［J］.岩土力学，2012，33(11):3489-3496.
XU J M，GU J C，CHEN A M，et al.Study of anti-explosion ability of reinforced tunnels with different anchor lengths and spacings［J］.Rock and Soil Mechanics，2012，33(11):3489-3496.(in Chinese)
［3］ SHIN J H，MOON H G，CHAE S E.Effect of blast-induced vibration on existing tunnels in soft rocks［J］.Tunnelling and Underground Space Technology，2011，26:51-61.
［4］ DENG X F，ZHU J B，CHEN S G，et al. Numerical study on tunnel damage subject to blast-induced shock wave in jointed rock masses［J］.Tunnelling and Underground Space Technology，2014，43:88-100.
［5］ DUAN B F，XIA H L，YANG X X.Impacts of bench blasting vibration on the stability of the surrounding rock masses of roadways［J］.Tunnelling and Underground Space Technology，2018，71:605-622.
［6］ LI X B，LI C J，CAO W Z，et al.Dynamic stress concentration and energy evolution of deep-buried tunnels under blasting loads［J］.International Journal of Rock Mechanics and Mining Sciences，2018，104: 131-146.
［7］李桂林，余永强，王新生.动载下洞室锚杆加固效应的数值模拟［J］.兵工学报，2009，30(增刊2): 42-46.
LI G L，YU Y Q，WANG X S.Numerical simulation of cavity bolt reinforcement effect under dynamic loading［J］. Acta Armamentarii，2009，30(S2): 42-46. (in Chinese)
［8］ ZHANG C S，ZOU D H，MADENGA V.Numerical simulation of wave propagation in grouted rock bolts and the effects of mesh density and wave frequency［J］.International Journal of Rock Mecha- nics and Mining Sciences，2006，43(4): 634-639.
［9］ TANNANT D D，BRUMMER R K，YI X. Rockbolt behaviour under dynamic loading: field tests and modelling［J］.International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1995，32(6): 537-550.
［10］ ORTLEPP W D，STACEY T R.Performance of tunnel support under large deformation，static and dynamic loading［J］.Tunnelling and Underground Space Technology，1998，13(1): 15-21.
［11］马海春，顾金才，张向阳，等.喷锚支护洞室抗爆现场试验洞顶位移研究［J］.岩土工程学报，2012，34(2): 369-372.
MA H C，GU J C，ZHANG X Y，et al. Displacement at top of underground cavern reinforced by grouted bolts during site explosion resisting tests［J］.Chinese Journal of Geotechnical Engineering，2012，34(2): 369-372. (in Chinese)
［12］杨建华，吴泽南，姚池，等.地下洞室爆破开挖诱发围岩损伤特性及PPV阈值研究［J］.振动与冲击，2019，38 (2):131-139.
YANG J H，WU Z N，YAO C，et al.Characteristics and PPV thresholds of rock damages under underground blasting excavation［J］.Journal of Vibration and Shock，2019，38 (2):131-139. (in Chinese)
［13］陈锐林，董琪，禹兵兵，等.近爆下泡沫混凝土复合结构在地下洞室的抗爆特性数值研究［J］.计算力学学报，2019，36(2): 267-277.
CHEN R L，DONG Q，YU B B，et al.Numerical research on anti-explosion capacity of foam concrete composite structure in underground openings under close-in explosion［J］.Chinese Journal
of Computational Mechanics，2019，36(2):267-277.(in Chinese)
［14］王占江，门朝举，刘冠兰，等.石灰岩中球形装药封闭化爆试验的自由场应力和地运动［J］.岩石力学与工程学报，2010，29(增刊1):3403-3410.
WANG Z J，MEN C J，LIU G L，et al. Free-field stress and ground motion of underground chemical explosions with spherical charge in limestone［J］.Chinese Journal of Rock Mechanics and Engineering，2010，29(S1):3403-3410.(in Chinese)
［15］王占江，李孝兰，戈琳，等.花岗岩中化爆的自由场应力波传播规律分析［J］. 岩石力学与工程学报，2003，22(11):1827-1831.
WANG Z J，LI X L，GE L，et al.Free-field stress wave propagation induced by underground confined chemical explosions in granite［J］.Chinese Journal of Rock Mechanics and Engineering，2003，22(11):1827-1831.(in Chinese)
［16］张宇，范华林，金丰年. 化爆作用下岩石介质自由场应力波传播方程拟合方法研究［J］.岩土力学，2011，32(10):3043-3047，3057.
ZHANG Y，FAN H L，JIN F N.Weighted least squares fitting of free field equation of rock under chemical explosion［J］.Rock and Soil Mechanics，2011，32(10):3043-3047，3057. (in Chinese)
［17］严东晋，钱七虎，唐德高，等.爆炸冲击振动对人体健康影响的评价［J］.土木工程学报，2000，33(1):100-106.
YAN D J，QIAN Q H，TANG D G，et al. Estimating the effect of blast shock vibration on health human-body［J］.China Civil Engineering Journal，2000，33(1):100-106.(in Chinese)

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