考虑法向应力与岩石强度的加锚节理岩体剪切力学模型研究

doi:10.13722/j.cnki.jrme.2022.0942

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (844 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为分析法向应力和岩石强度对锚杆锚固效应的影响规律，选取红砂岩、石灰岩、玄武岩3种代表性岩石开展加锚节理岩体直接剪切试验，基于试验结果，根据静定梁理论和最小余能原理，建立考虑岩石结构效应和等效剪切面积的加锚节理岩体力学分析模型，并结合理论计算公式，分析不同锚固角下岩石强度对锚杆轴向力和剪切力的影响规律。研究表明：锚杆的锚固效应在宏观上表现为增加节理面的当量内摩擦角和黏聚力，且岩石强度越大，锚杆对节理面剪切强度的贡献值就越大。与试验数据和已有分析模型对比分析表明，理论模型的计算值与试验结果更为吻合。通过计算分析可知，随着锚固角的增加，锚杆轴向力对节理面剪切强度的贡献度逐渐减小，剪切力对节理面剪切强度的贡献度逐渐增加，并且锚杆最佳锚固角在50°～70°范围。

	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
	宋洋1
	范波2
	王贺平2

关键词 ：岩石力学, 锚固节理面, 岩石强度, 锚固效应, 黏聚力, 内摩擦角

Abstract：In order to analyze the influence of normal stress and rock strength on anchor bolt anchoring mechanism，three representative rocks，namely red sandstone，limestone and basalt，were selected to carry out direct shear tests of jointed rock mass under different normal stress levels. Based on the test results，according to the statically determinate beam theory and the principle of minimum complementary energy，this paper establishes a shear strength model of joint surface which considers the effect of rock structure and equivalent shear area. And combined with the theoretical calculation formula，this paper analyzes the influence law of rock strength on the axial force and shear force under different anchorage angles. The research shows the anchoring effect of anchor bolts is shown as increasing the equivalent internal friction angle and cohesion of joint surface，and that the greater the rock strength，the greater the contribution of the bolt to the shear strength of the joint plane. Compared with the experimental data and the existing analytical model，the calculated values of the theoretical model are more consistent with the experimental results. Through calculation and analysis，it can be seen that with the increase of the anchorage angle，the contribution of the axial force of the bolt to the shear strength of the joint surface gradually decreases，while the contribution of the shear force to the shear strength of the joint surface gradually increases，and the optimal anchorage angle of the bolt is within the range of 50°to 70°.

Key words： rock mechanics anchoring joint surface rock strength anchoring effect cohesion internal friction angle

引用本文:

宋洋1，范波2，王贺平2. 考虑法向应力与岩石强度的加锚节理岩体剪切力学模型研究[J]. 岩石力学与工程学报, 2023, 42(6): 1325-1335.
SONG Yang1，FAN Bo2，WANG Heping2. Research on shear mechanics model of anchored-jointed rock mass#br# considering normal stress and rock strength. , 2023, 42(6): 1325-1335.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0942 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I6/1325

[15]	DIGHT P M. Improvements to the stability of rock walls to open pit mines[Ph. D. Thesis][D]. Melbom：Monash University，1982.
[3]	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.
[10]	PELLET F，EGGER P. Analytical model for the mechanical behavior of bolted rock joints subjected to shearing[J]. Rock Mechanics and Rock Engineering，1996，29(2)：73-97.
[12]	黎海滨，谭捍华，袁维，等. 剪切方向与锚杆倾向垂直条件下锚杆的锚固机制研究[J]. 应用力学学报，2021，38(5)：1 995-2 003. (LI Haibin，TAN Hanhua，YUAN Wei，et al. Research on the anchorage mechanism of the bolt under the condition that the shear direction and the inclination of the bolt are perpendicular[J]. Chinese Journal of Applied Mechanics，2021，38(5)：1 995-2 003.(in Chinese))
[13]	李育宗，刘才华. 拉剪作用下节理岩体锚固力学分析模型[J]. 岩石力学与工程学报，2016，35(12)：2 471-2 478.(LI Yuzong，LIU Caihua. Anchorage mechanics analysis model of jointed rock mass under tension-shear action[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(12)：2 471-2 478.(in Chinese))
[18]	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. Analysis of the stress mechanism during the shearing process of the bolt[J]. Journal of Huazhong University of Science and Technology：Natural Science，2019，47(3)：127-132.(in Chinese))
[20]	杨延毅. 加锚层状岩体的变形破坏过程与加固效果分析模型[J]. 岩石力学与工程学报，1994，13(4)：309-317.(YANG Yanyi. Deformation failure process and reinforcement effect analysis model of anchored layered rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，1994，13(4)：309-317.(in Chinese))
[6]	郭浩希. 锚固角度对加锚节理面的剪切特性影响分析[硕士学位论文][D]. 广州：华南理工大学，2019.(GUO Haoxi. Analysis of the influence of anchoring angle on shear characteristics of anchored joint surfaces[M. S. Thesis][D]. Guangzhou：South China University of Technology，2019.(in Chinese))
[9]	汪小刚，周纪军，贾志欣，等. 加锚节理面的抗剪试验研究 [J]. 岩土力学，2016，37(增2)：250-256.(WANG Xiaogang，ZHOU Jijun，JIA Zhixin，et al. Shear test study of anchored joint surfaces[J]. Rock and Soil Mechanics，2016，37(Supp.2)：250-256.(in Chinese))
[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 anchored joint surfaces[J]. Chinese Journal of Geotechnical Engineering，1988，10(1)：8-19.(in Chinese))
[4]	LI X，AZIZ N，MIRZAGHORBANALI A，et al. Behavior of fiber glass bolts，rock bolts and cable bolts in shear[J]. Rock Mechanics and Rock Engineering，2016，49(7)：2 723-2 735.
[7]	何栋梁，杨伟军，林杭，等. 拉-剪状态下锚固节理剪切强度与破坏模式分析[J]. 公路交通科技，2019，36(4)：95-101.(HE Dongliang，YANG Weijun，LIN Hang，et al. Analysis of shear strength and failure mode of anchoring joints in tension-shear state[J]. Highway Traffic Technology，2019，36(4)：95-101.(in Chinese))
[14]	HOLMBERG M. The mechanical behavior of untensioned grouted rock bolts[Ph. D. Thesis][D]. Stockholm：Royal Institute of Technology，1991.
[16]	王发玲，刘才华，龚哲. 顺层岩质边坡锚杆支护机制研究[J]. 岩石力学与工程学报，2014，33(7)：1 465-1 470.(WANG Faling，LIU Caihua，GONG Zhe. Study on the bolt support mechanism of bedding rock slope[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(7)：1 465-1 470.(in Chinese))
[17]	陈文强，贾志欣，赵宇飞，等. 剪切过程中锚杆的轴向和横向作用分析[J]. 岩土力学，2015，36(1)：143-148.(CHEN Wenqiang，JIA Zhixin，ZHAO Yufei，et al. Analysis of axial and lateral action of bolt during shearing[J]. Rock and Soil Mechanics，2015，36(1)：143-148.(in Chinese))
[2]	刘泉声，雷广峰，彭星新，等. 白砂岩、大理岩及花岗岩加锚剪切力学特性研究[J]. 岩石力学与工程学报，2018，37(增2)：4 007-4 015.(LIU Quansheng，LEI Guangfeng，PENG Xingxin，et al. Research on shear mechanical properties of white sandstone，marble and granite with anchors[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(Supp.2)：4 007-4 015.(in Chinese))
[5]	刘曙光，黄泽信，张洪. 不同锚固角加锚无摩擦节理面剪切试验研究[J]. 地下空间与工程学报，2022，18(3)：824-831.(LIU Shuguang，HUANG Zexin，ZHANG Hong. Shear test study on frictionless joints with different anchoring angles[J]. Chinese Journal of Underground Space and Engineering，2022，18(3)：824-831.(in Chinese))
[8]	腾俊洋，张宇宁，唐建新，等. 锚固方式对节理岩体剪切性能影响试验研究[J]. 岩土力学，2017，38(8)：2 279-2 285.(TENG Junyang，ZHANG Yuning，TANG Jianxin，et al. Experimental study on the effect of anchoring methods on the shear performance of jointed rock mass[J]. Rock and Soil Mechanics，2017，38(8)：2 279-2 285.(in Chinese))
[1]	CHEN Y，LI C. Influences of loading condition and rock strength to the performance of rock bolts[J]. Geotechnical Testing Journal，2015，38(2)：207-218.
[11]	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. Model research and experimental verification of bolt shear mechanics in jointed rock mass[J]. Chinese Journal of Geotechnical Engineering，2018，40(5)：794-801.(in Chinese))