恒定法向刚度边界条件下锚固节理岩体剪切特性试验研究

doi:10.13722/j.cnki.jrme.2020.0871

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (3369 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要锚固节理岩体的剪切特性对于岩体工程稳定性控制设计至关重要。开展一系列不同恒定法向刚度(CNS)边界条件下锚固和无锚固类岩石材料粗糙节理剪切试验，研究CNS边界条件对锚固节理剪切力学特性以及节理面剪切破坏、锚杆剪切变形破断和锚杆破断剪切位移特征的影响。结果表明：峰前阶段法向刚度对剪切应力第一峰值Tp的影响不明显；峰后阶段剪切应力–剪切位移曲线在法向刚度小于3 GPa/m时呈位移软化特征、等于3 GPa/m时趋近于水平、等于5 GPa/m时呈位移硬化特征，随着法向刚度的增加锚杆破断剪切应力Tf会显著提高；锚杆破断后阶段剪切应力–剪切位移曲线呈台阶式下沉。锚固节理的Tp和Tf都高于无锚固节理，法向刚度超过3 GPa/m后锚固作用可抵消因节理面磨损导致的剪切强度损失。剪切应力第一峰值提升的剪切强度T1随法向刚度和JRC的增大呈增大趋势，而锚杆破断提升剪切强度T2随法向刚度增大呈减小趋势、随JRC增大呈增大趋势。节理面的破坏范围随法向刚度增大而增大，锚杆孔壁椭圆形破坏范围随法向刚度增大而减小。锚杆剪切后呈现“Z”字型变形特征，随法向刚度增加锚杆破断形式由拉伸破坏到弯曲破坏再到剪切破坏转换。锚杆破断剪切位移在法向刚度为0～1 GPa/m阶段呈增大趋势，1～5 GPa/m阶段呈持续减小趋势。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	蒋宇静1
	2
	3
	张孙豪1
	2
	栾恒杰1
	2
	王长盛1
	2
	3
	文志杰1
	2
	王冬1
	2
	韩伟3

关键词 ：岩石力学, 锚固节理, 剪切特性, 节理粗糙度, 恒定法向刚度, 边界条件

Abstract：Understanding the shear behavior of bolted rock joints is crucial to designing of geotechnical projects that include discontinuities. The effects of constant normal stiffness(CNS) boundary conditions on shear characteristics of bolted rock joints were investigated through shear tests on bolted rock joints and non-bolted rock joints under different CNS boundary conditions. The results show that，at the pre peak stage，the effect of the normal stiffness on the first peak value of the shear stress(Tp) is not obvious. At the post peak stage， the shear stress-shear displacement curve respectively shows displacement softening characteristic，stability characteristic，and displacement hardening characteristic when the normal stiffness is less than 3 GPa/m，equal to 3 GPa/m and equal to 5 GPa/m, and the shear stress of bolt broken(Tf) increases significantly with increasing the normal stiffness. At the bolt broken stage，the shear stress-shear displacement shows step subsidence. The Tp and Tf of bolted joints are both higher than those of non-bolted joints. When the normal stiffness exceeds 3 GPa/m，the shear strength loss caused by joint wear can be counteracted by bolting. The first peak value increment of the shear stress(T1) increases with increasing the normal stiffness and JRC，while the shear stress increment of bolt broken(T2) decreases with increasing the normal stiffness and increases with increasing JRC. The failure range of the joint surface increases with increasing the normal stiffness，and the elliptical failure range of the bolt hole wall decreases with increasing the normal stiffness. The deformation of the bolt shows a shape of“Z”after shearing，and the failure mode of the bolt changes from tensile failure to bending failure and then to shear failure as the normal stiffness increases. The breaking shear displacement of the bolt tends to increase as the normal stiffness ranging from 0 to 1 GPa/m and decreases continuously as the normal stiffness varying from 1 to 5 GPa/m.

Key words： rock mechanics bolted rock joint shear characteristics joint roughness coefficient constant normal stiffness boundary conditions

引用本文:

蒋宇静1，2，3，张孙豪1，2，栾恒杰1，2，王长盛1，2，3，文志杰1，2，王冬1，2，韩伟3. 恒定法向刚度边界条件下锚固节理岩体剪切特性试验研究[J]. 岩石力学与工程学报, 2021, 40(4): 663-675.
JIANG Yujing1，2，3，ZHANG Sunhao1，2，LUAN Hengjie1，2，WANG Changsheng1，2，3，WEN Zhijie1，2，WANG Dong1，2，HAN Wei3. Experimental study on shear characteristics of bolted rock joints under constant normal stiffness boundary conditions. , 2021, 40(4): 663-675.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0871 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I4/663

[10]	SRIVASTAVA L P，SINGH M. Effect of fully grouted passive bolts on joint shear strength parameters in a blocky mass[J]. Rock Mechanics and Rock Engineering，2015，48(3)：1 197-1 206.
[20]	张伟，刘泉声. 节理岩体锚杆的综合变形分析[J]. 岩土力学，2012，33(4)：1 067-1 074.(ZHANG Wei，LIU Quansheng. Synthetical deformation analysis of anchor bolt in jointed rock mass[J]. Rock and Soil Mechanics，2012，33(4)：1 067-1 074.(in Chinese))
[12]	LI X W，YANG G Y，NEMCIK J，et al. Numerical investigation of the shear behaviour of a cable bolt in single shear test[J]. Tunnelling and Underground Space Technology，2019，84：227-236.
[22]	MA S Q，ZHAO Z Y，SHANG J L. An analytical model for shear behaviour of bolted rock joints[J]. International Journal of Rock Mechanics and Mining Sciences，2019，121：104019.
[30]	SAADAT M，TAHERI A. Effect of contributing parameters on the behaviour of a bolted rock joint subjected to combined pull-and-shear loading：A DEM Approach[J]. Rock Mechanics and Rock Engineering，2020，53：383-409.
[32]	GRASSELLI G. 3D Behaviour of bolted rock joints：experimental and numerical study[J]. International Journal of Rock Mechanics and Mining Sciences，2005，42(1)：13-24.
[15]	位伟，姜清辉，周创兵. 节理面附近锚杆力学模型及其数值流形方法应用[J]. 工程力学，2014，31(11)：70-78.(WEI Wei，JIANG Qinghui，ZHOU Chuangbing. A mechanical model of a bolt in the vicinity of a joint and its numerical manifold method(NMM) applicition[J]. Engineering Mechanics，2014，31(11)：70-78.(in Chinese))
[25]	THIRUKUMARAN S，INDRARATNA B. A review of shear strength models for rock joints subjected to constant normal stiffness[J]. Journal of Rock Mechanics and Geotechnical Engineering，2016，8(3)：405-414.
[35]	班力壬，戚承志，单仁亮，等. 节理峰前剪切刚度软化模型及其影响因素分析[J]. 煤炭学报，2018，43(10)：2 765-2 772.(BAN Liren，QI Chengzhi，SHAN Renliang，et al. Pre-peak shear constitutive model considering the softening shear stiffness and its influencing factors[J]. Journal of China Coal Society，2018，43(10)：2 765-2 772.(in Chinese))
[13]	刘爱卿，鞠文君，许海涛，等. 锚杆预紧力对节理岩体抗剪性能影响的试验研究[J]. 煤炭学报，2013，38(3)：391-396.(LIU Aiqing，JU Wenjun，XU Haitao，et al. Experimental study on the effect of bolt prestress on shear behavior of jointed rock mass[J]. Journal of China Coal Society，2013，38(3)：391-396.(in Chinese))
[23]	夏才初，喻强锋，钱鑫，等. 常法向刚度条件下岩石节理剪切-渗流特性试验研究[J]. 岩土力学，2020，41(1)：57-77.(XIA Caichu，YU Qiangfeng，QIAN Xin，et al. Experimental study of shear-seepage behaviour of rock joints under constant normal stiffness[J]. Rock and Soil Mechanics，2020，41(1)：57-77.(in Chinese))
[33]	CHEN N，ZHANG X B，JIANG Q H，et al. Shear behavior of rough rock joints reinforced by bolts[J]. International Journal of Geomechanics，2018，18(1)：4017130.
[11]	LIU C H，LI Y Z. Analytical study of the mechanical behavior of fully grouted bolts in bedding rock slopes[J]. Rock Mechanics and Rock Engineering，2017，50(9)：2 413-2 423.
[21]	陈文强，赵致艺，赵宇飞. 剪切荷载作用下锚杆抗剪作用理论分析[J]. 地下空间与工程学报，2018，14(3)：650-656.(CHEN Wenqiang，ZHAO Zhiyi，ZHAO Yufei. Theoretical Analysis on Shear Resistance of Bolt under Shear Loading[J]. Chinese Journal of Underground Space and Engineering，2018，14(3)：650-656.(in Chinese))
[31]	CUI G J，ZHANG C Q，CHEN J L，et al. Effect of bolt inclination angle on shear behavior of bolted joints under CNL and CNS conditions[J]. Journal of Central South University，2020，27(3)：937-950.
[2]	WU X Z，JIANG Y J，GONG B，et al. Behaviour of rock joint reinforced by energy-absorbing rock bolt under cyclic shear loading condition[J]. International Journal of Rock Mechanics and Mining Sciences，2018，110：88-96.
[3]	王刚，袁康，蒋宇静，等. 基于颗粒离散元法的锚固节理剪切行为宏细观研究[J]. 煤炭学报，2014，39(12)：2 381-2 389.(WANG Gang，YUAN Kang，JIANG Yujing，et al. Macro-micro mechanical study on bolted joint subjected to shear loading based on DEM[J]. Journal of China Coal Society，2014，39(12)：2 381-2 389.(in Chinese))
[5]	BJURSTROM S. Shear strength of hard rock joints reinforced by grouted untensioned bolts[C]// Proceedings of the 3rd international congress on rock mechanics. Washington，DC：National Academy of Sciences，1974，2(Part B)：1 194-1 199.
[1]	刘泉声，雷广峰，彭星新，等. 节理岩体中锚杆剪切力学模型研究及试验验证[J]. 岩土工程学报，2018，40(5)：794-801.(LIU Quansheng，LEI Guangfeng，PENG Xingxin，et al. Shearing mechanical model and experimental verification of bolts in jointed rock mass[J]. Chinese Journal of Geotechnical Engineering，2018，40(5)：794-801.(in Chinese))
[6]	刘泉声，雷广峰，彭星新，等.锚杆锚固对节理岩体剪切性能影响试验研究及机制分析[J]. 岩土力学，2017，38(1)：27-35.(LIU Quansheng，LEI Guangfeng，PENG Xingxin，et al. Experimental study and mechanism analysis of influence of bolt anchoring on shear properties of jointed rock mass[J]. Rock and Soil Mechanics，2017，38(1)：27-35.(in Chinese))
[9]	CHEN Y，LI C C. Performance of fully encapsulated rebar bolts and D-Bolts under combined pull-and-shear loading[J]. Tunnelling and Underground Space Technology，2015，45：99-106.
[16]	BAHRANI N，HADJIGEORGIOU J. Explicit reinforcement models for fully-grouted rebar rock bolts[J]. Journal of Rock Mechanics and Geotechnical Engineering，2017，9(2)：267-280.
[19]	葛修润，刘建武. 加锚节理面抗剪性能研究[J]. 岩土工程学报，1988，10(1)：8-19.(GE Xiurun，LIU Jianwu. Study on shear performance of anchorage joint surface[J]. Chinese Journal of Geotechnical Engineering，1988，10(1)：8-19.(in Chinese))
[26]	崔国建，张传庆，韩华超，等. CNL及CNS条件下结构面剪切特性试验研究[J]. 岩石力学与工程学报，2019，38(增2)：3 384-3 392. (CUI Guojian，ZHANG Chuanqing，HAN Huachao，et al. Experiment study on shear behavior of artificial joint under CNL and CNS boundary conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(Supp. 2)：3 384-3 392.(in Chinese))
[29]	MENG B，JING H W，YANG S Q，et al. Experimental study on shear behavior of bolted cement mortar blocks under constant normal stiffness[J]. KSCE Journal of Civil Engineering，2019，23(8)：3 724-3 734.
[36]	杨步云，肖明，罗宁，等. 锚杆剪切过程中的受力机理分析[J]. 华中科技大学学报：自然科学版，2019，47(3)：127-132.(YANG Buyun，XIAO Ming，LUO Ning，et al. Research on mechanical characteristic of anchor bolt in process of shearing[J]. Journal of Huazhong University of Science and Technology：Nature Science，2019，47(3)：127-132.(in Chinese))
[7]	JALALIFAR H，AZIZ N，HADI M. The effect of surface profile，rock strength and pretension load on bending behaviour of fully grouted bolts[J]. Geotechnical and Geological Engineering，2006，24(5)：1 203-1 227.
[17]	LIN H，XIONG Z，LIU T，et al. Numerical simulations of the effect of bolt inclination on the shear strength of rock joints[J]. International Journal of Rock Mechanics and Mining Sciences，2014，66：49-56.
[27]	DEY A. Shear behaviour of fully grouted bolts under constant normal stiffness condition[Ph. D. Thesis][D]. Wollongong，Australia：University of Wollongong，2001.
[4]	刘才华，李育宗. 考虑横向抗剪效应的节理岩体全长黏结型锚杆锚固机制研究及进展[J]. 岩石力学与工程学报，2018，37(8)：1 856-1 872.(LIU Caihua，LI Yuzong. Research and progress on the anchoring mechanism of full-length bonding bolt in jointed rock mass considering transverse shear effect[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(8)：1 856-1 872.(in Chinese))
[14]	宋洋，李永启，王韦颐，等. 加锚节理岩体剪切蠕变特性及其本构模型分析[J]. 煤炭学报，2020，45(4)：1 357-1 366.(SONG Yang，LI Yongqi，WANG Weiyi，et al．Shear creep characteristics and constitutive model analysis of jointed rock mass[J]. Journal of China Coal Society，2020，45(4)：1 357-1 366.(in Chinese))
[24]	JIANG Y，XIAO J，TANABASHI Y，et al. Development of an automated servo-controlled direct shear apparatus applying a constant normal stiffness condition[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(2)：275-286.
[34]	JALALIFAR H，AZIZ N. Analytical behaviour of bolt-joint intersection under lateral loading conditions[J]. Rock Mechanics and Rock Engineering，2010，43(1)：89-94.
[8]	WU X Z，JIANG Y J，LI B. Influence of joint roughness on the shear behaviour of fully encapsulated rock bolt[J]. Rock Mechanics and Rock Engineering，2018，51(3)：953-959.
[18]	何栋梁，杨伟军，林杭，等. 锚固节理直剪力学行为的颗粒流数值分析[J]. 工程地质学报，2019，27(2)：302-310.(HE Dongliang，YANG Weijun，LIN Hang，et al. Numerical analysis for direct shear test of bolted joint based on particle flow code[J]. Journal of Engineering Geology，2019，27(2)：302-310.(in Chinese))
[28]	INDRARATNA B，AZIZ N，DEY A. Modeling of bolted joint behaviour under constant normal stiffness conditions-laboratory study [J/OL]. https://ro.uow.edu.au/engpapers/677.2000.