预应力锚杆拉拔力学特性及临界锚固长度研究

doi:10.13722/j.cnki.jrme.2023.0832

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摘要相较于非预应力锚杆而言，预应力锚杆在受到拉拔作用后呈现出特殊的支护力学特性。为深入探明预应力锚杆的这一特点，采用足尺室内实验和理论分析的方法研究预应力锚杆在受载后的力学响应情况，掌握预应力锚杆的支护力学特点及其机制，进一步丰富和扩展了预应力锚杆的主动支护理论，并从锚固系统支护效果最优化的角度出发，基于二次开发手段提出一种预应力树脂锚杆临界锚固长度的数值计算方法。结果表明：(1) 预应力施加后锚杆的荷载–位移曲线形态发生了明显变化，在前期支护刚度增加，同时出现荷载突变点，且随着预应力施加量值的增加，突变点处荷载从17.3 kN增加至54.6 kN；(2) 预应力锚杆在受载后呈现出“先刚后强”的支护力学特性，在支护前期能够迅速达到较大的承载力，有效提高锚杆控制围岩变形的能力；(3) 建立的数值分析模型很好地再现了锚固系统在受到拉拔荷载时的力学响应情况，基于该模型分析了不同锚固长度条件下锚固系统的承载能力峰值，确定了该实验条件下树脂锚杆的临界锚固长度为44 cm。相关研究成果对认识预应力锚固系统的支护力学特性和参数设计具有指导意义。

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	孙克国1
	许炜萍1
	黄谦1
	武佩锋2
	唐礼1
	金鹏3
	王金金1
	张政2

关键词 ：岩石力学, 预应力, 锚杆, 拉拔实验, 锚固长度, 支护力学

Abstract：Compared with the non-prestressed bolt，the prestressed bolt shows special supporting mechanical characteristics after being pulled out. In order to deeply investigate this characteristic of the prestressed bolt，the full-scale indoor experiments and theoretical analysis were used to study the mechanical response of the prestressed bolt after being loaded，and the supporting mechanical characteristics of the prestressed bolt and its mechanism were further understood，which further extended the active support theory of the prestressed bolt. Additionally，from the perspective of optimizing the support performance of the anchorage system，the numerical calculation method for the critical anchorage length of the prestressed resin bolt was proposed based on the secondary development mean. The results showed that：(1) After the prestress was applied，the shape of the load-displacement curve of the bolt changed obviously，the support stiffness increased in the early stage，and the load mutation point appeared at the same time. With the increase of prestress application value，the load value at the mutation point increased from 17.3 kN to 54.6 kN；(2) The prestressed bolt exhibited an initial increase in stiffness after being subjected to the tensile load，followed by an increase in strength in support mechanics，quickly providing the larger bearing capacity in the early stage of support and effectively improving the ability of the anchorage system to control the deformation of the surrounding rock；(3) The established numerical analysis model well reproduced the mechanical response of the anchorage system under the tensile load，based on which the peak bearing capacities of the anchorage system under different anchorage length conditions had been analyzed，and the critical anchorage length of the resin bolt under this experimental condition had been determined to be 44 cm. The relevant research results have guiding significance for understanding the support mechanical characteristics and parameter design of prestressed anchorage systems.

Key words： rock mechanics prestress bolt pulling-out experiment anchorage length support mechanics

引用本文:

孙克国1，许炜萍1，黄谦1，武佩锋2，唐礼1，金鹏3，王金金1，张政2 . 预应力锚杆拉拔力学特性及临界锚固长度研究[J]. 岩石力学与工程学报, 2024, 43(3): 653-669.
SUN Keguo1，XU Weiping1，HUANG Qian1，WU Peifeng2，TANG Li1， JIN Peng3，WANG Jinjin1，ZHANG Zheng2. Study on pull-out mechanical characteristics and critical anchorage length of prestressed anchor bolts. , 2024, 43(3): 653-669.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0832 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I3/653

[2]	康红普. 我国煤矿巷道围岩控制技术发展70年及展望[J]. 岩石力学与工程学报，2021，40(1)：1-30.(KANG Hongpu. Seventy years development and prospects of strata control technologies for coal mine roadways in China[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(1)：1-30.(in Chinese))
[11]	张建海，王仁坤，周钟，等. 高地应力地下厂房预应力锚索预紧系数[J]. 岩土力学，2018，39(3)：1 002-1 008.(ZHANG Jianhai，WANG Renkun，ZHOU Zhong，et al. Pre-load factor of the pre-stressed anchor cable in underground powerhouse with high geo-stress[J]. Rock and Soil Mechanics，2018，39(3)：1 002-1 008.(in Chinese))
[20]	ZHU B，ZHOU C B，JIANG N. Dynamic characteristics and safety control of mortar bolts under tunnel blasting vibration loads[J]. Tunnelling and Underground Space Technology，2023，135：105005.
[9]	张庆国，赵红星，袁爽，等. 基于巷道围岩预应力分布特征的锚杆支护参数研究[J]. 煤炭工程，2022，54(8)：30-36.(ZHANG Qingguo，ZHAO Hongxing，YUAN Shuang，et al. A practical method for designing supporting parameters of rock bolt based on pretension stress distribution in surrounding rock[J]. Coal Engineering，2022，54(8)：30-36.(in Chinese))
[18]	林健，石垚，孙志勇，等. 端部锚固锚杆预应力场分布特征的大型模型试验研究[J]. 岩石力学与工程学报，2016，35(11)：2 237-2 247.(LIN Jian，SHI Yao，SUN Zhiyong，et al. Large scale model test on the distribution characteristics of the prestressed field of end-anchored bolts[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(11)：2 237-2 247.(in Chinese))
[7]	李海燕，张红军，李术才，等. 新型高预应力锚索及锚注联合支护技术研究与应用[J]. 煤炭学报，2017，42(3)：582-589.(LI Haiyan，ZHANG Hongjun，LI Shucai，et al. Research and application on new high pre-stressed anchor cable with bolt-grouting comprehensive support technology[J]. Journal of China Coal Society，2017，42(3)：582-589.(in Chinese))
[16]	曾宪明，林大路，李世民，等. 锚固类结构杆体临界锚固长度问题综合研究[J]. 岩石力学与工程学报，2009，28(增2)：3 609-3 625. (ZENG Xianming，LIN Dalu，LI Shimin，et al. Comprehensive research of critical anchorage length problem of rod of anchorage structure[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.2)：3 609-3 625.(in Chinese))
[25]	ZHAO X W，SUN K G，HUANG Q，et al. Research on the reasonable anchorage length and failure characteristics of resin anchorage system[J]. Construction and Building Materials，2022，356：129309.
[1]	刘少伟，崔磊，马念杰，等. 螺纹钢锚杆楔形端部搅拌树脂锚固剂运移特征及锚固实验[J]. 岩石力学与工程学报，2022，41(1)：40-52.(LIU Shaowei，CUI Lei，MA Nianjie，et al. Flow characteristics of stirring resin at wedge end of bolts and anchorage test[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(1)：40-52. (in Chinese))
[3]	田四明，吴克非，刘大刚，等. 软弱围岩隧道变形控制主动支护理念及技术[J]. 铁道学报，2021，43(6)：158-164.(TIAN Siming，WU Kefei，LIU Dagang，et al. Study on active support technology for deformation control of tunnels in soft surrounding rock[J]. Journal of the China Railway Society，2021，43(6)：158-164.(in Chinese))
[4]	康红普，姜铁明，高富强. 预应力在锚杆支护中的作用[J]. 煤炭学报，2007，154(7)：680-685.(KANG Hongpu，JIANG Tieming，GAO Fuqiang. Effect of pretensioned stress to rock bolting[J]. Journal of China Coal Society，2007，154(7)：680-685.(in Chinese))
[8]	殷小亮，张艳博，钟科，等. 浅埋大跨度隧道预应力锚杆锚固参数及支护设计研究[J]. 金属矿山，2023，(2)：58-66.(YIN Xiaoliang，ZHANG Yanbo，ZHONG Ke，et al. Research on anchorage parameters and support design of prestressed anchors in shallow buried large span tunnels[J]. Metal Mine，2023，(2)：58-66.(in Chinese))
[10]	王洪涛，王琦，李术才，等. 基于上限理论的深部巷道顶板锚杆预紧力简化设计方法[J]. 煤炭学报，2015，40(7)：1 477-1 484. (WANG Hongtao，WANG Qi，LI Shucai，et al. A simplified design method of pre-tightening force of roof bolts in deep roadway based on upper bound theory[J]. Journal of China Coal Society，2015，40(7)：1 477-1 484.(in Chinese))
[13]	LI P F，CHEN Y，HUANG J L，et al. Design principles of prestressed anchors for tunnels considering bearing arch effect[J]. Computers and Geotechnics，2023，156：105307.
[17]	王洪涛，王琦，王富奇，等. 不同锚固长度下巷道锚杆力学效应分析及应用[J]. 煤炭学报，2015，40(3)：509-515.(WANG Hongtao，WANG Qi，WANG Fuqi，et al. Mechanical effect analysis of bolts in roadway under different anchoring lengths and its application[J]. Journal of China Coal Society，2015，40(3)：509-515.(in Chinese))
[19]	CHEN J H，LI D Q. Numerical simulation of fully encapsulated rock bolts with a tri-linear constitutive relation[J]. Tunnelling and Underground Space Technology，2022，120：104265.
[22]	FAN W C，YANG H，JIANG X L，et al. Experimental and numerical investigation on crack mechanism of folded flawed rock-like material under uniaxial compression[J]. Engineering Geology，2021，291：106210.
[26]	FU M X，HUANG S S，FAN K S，et al. Study on the relationship between the maximum anchoring force and anchoring length of resin-anchored bolts of hard surrounding rocks based on the main slip interface[J]. Construction and Building Materials，2023，409：134000.
[5]	康红普. 我国煤矿巷道锚杆支护技术发展60年及展望[J]. 中国矿业大学学报，2016，45(6)：1 071-1 081.(KANG Hongpu. Sixty years development and prospects of rock bolting technology for underground coal mine roadways in China[J]. Journal of China University of Mining and Technology，2016，45(6)：1 071-1 081.(in Chinese))
[6]	汪波，喻炜，訾信，等. 基于统一强度理论的围岩-锚杆(索)弹塑性耦合分析[J]. 岩石力学与工程学报，2023，42(11)：2 613-2 627.(WANG Bo，YU Wei，ZI Xin，et al. Elastoplastic coupling analysis of surrounding rock-anchor bolt(cable) based on unified strength theory[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(11)：2 613-2 627.(in Chinese))
[12]	郭新新，汪波，刘锦超，等. 软岩隧道锚固系统预紧力匹配性设计方法与实践[J]. 铁道科学与工程学报，2023，20(2)：651-660. (GUO Xinxin，WANG Bo，LIU Jinchao，et al. Design method and practice of pre-tightening matching for anchorage system of soft rock tunnel[J]. Journal of Railway Science and Engineering，2023，20(2)：651-660.(in Chinese))
[14]	LI G，HU Y，TIAN S M，et al. Analysis of deformation control mechanism of prestressed anchor on jointed soft rock in large cross-section tunnel[J]. Bulletin of Engineering Geology and the Environment，2021，80：9 089-9 103.
[15]	张洁，尚岳全，叶彬. 锚杆临界锚固长度解析计算[J]. 岩石力学与工程学报，2005，24(7)：1 134-1 138.(ZHANG Jie，SHANG Yuequan，YE Bin. Analytical calculations of critical anchorage length of bolts[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(7)：1 134-1 138.(in Chinese))
[21]	ZHAO D P，WEN S X，WANG L W，et al. Structural parameters and critical anchorage length of tunnel system bolts made of basalt fibre[J]. Construction and Building Materials，2021，310：125081.
[23]	JIN J，CAO P，CHEN Y，et al. Influence of single flaw on the failure process and energy mechanics of rock-like material[J]. Computers and Geotechnics，2017，86：150-162.
[24]	POTYONDY D O，CUNDALL P A. A bonded-particle model for rock[J]. International journal of rock mechanics and mining sciences，2004，41(8)：1 329-1 364.