Field Experimental Study on Mechanical Properties of Self-swelling Split-Set

doi:10.12068/j.issn.1005-3026.2024.07.014

Abstract

Abstract:

The anchoring force of the split?set is affected by factors such as hole diameter difference and rock mass conditions， resulting in large fluctuations of the output anchoring force. The self?swelling split?set can improve the anchoring performance of the conventional split?set， and increase the load capacity and energy absorption capacity of the anchor. In this paper， the intelligent rockbolt pull?out test system is used to study the influence of different installation angles and roll lengths on the mechanical properties of self?swelling split?set under two extreme conditions： broken soft rock and intact hard rock. The results show that the anchoring force of the bolt is linearly and positively correlated with the length of the roll. The higher the strength of the surrounding rock， the faster the growth rate of the anchoring force. Under the same working condition， the anchoring force of the anchor is positively related to the installation angle， with the maximum anchoring force achieved when installed vertically. The lower the surrounding rock strength is， the greater the influence of the installation angle on the anchoring force is. Compared with conventional split?set， the self?swelling split?set can increase the anchoring force by 1.88 times and 3.15 times， and the energy absorption capacity by 143.7% and 259.6% under two extreme conditions， significantly improving the anchoring effect on the basis of sliding deformation.

Key words: self?swelling roll, anchoring force, installation angle, energy absorption capacity, pull?out on site

CLC Number:

TD 353

Zheng-ming YANG, Shuai XU, Xu-bo JI, Rui-qiang WANG. Field Experimental Study on Mechanical Properties of Self-swelling Split-Set[J]. Journal of Northeastern University(Natural Science), 2024, 45(7): 1020-1027.

Figures/Tables 16

Fig.1 Structural diagram of self?swelling split?set

Table 1 Test scheme of different influencing factors

影响因素	水平
药卷长度/cm	0，10，20，30，40
安装角度/（°）	30，45，60，90
岩石强度	破碎软岩、完整硬岩

Table 2 Test site and rock mechanical parameters

试验地点	岩性	岩石单轴抗压强度/MPa	岩石内摩擦角/（°）	岩石内聚力/MPa	岩石弹性模量/GPa	泊松比
腊子沟矿区-175 m中段56线穿脉	煌斑岩	28.6	20	36.6	25.08	0.16
辽上矿区-9 m中段7线平巷	大理岩	133.0	36	23.6	42.73	0.12

Fig.2 Intelligent rockbolt pull?out test system

Fig.3 Test method of split?set on site

Fig.4 Installation and test process of split?set on site

Fig.5 Schematic diagram of different drilling angles

Fig.6 Field pull?out test results of different charge lengths in Liaoshang mining area

Fig.7 Absorbed energy of different roll lengths in Liaoshang mining area

Fig.8 Pull?out results of different installation angles in Liaoshang mining area

Fig.9 Test results of self?swelling split?set with different roll lengths in Lazigou mining area

Fig.10 Statistics of absorbed energy of different roll lengths in Lazigou mining area

Fig.11 Pull?out results at different installation angles in Lazigou mining area

Fig.12 Analysis of pull?out results with different roll lengths

Fig.13 Analysis of pull?out test results at different installation angles

Fig.14 Phenomenon of self?swelling split?set

References 21

1	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 Hong‑pu.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.
2	He L， An X M， Zhao X B.Development of a unified rock bolt model in discontinuous deformation analysis［J］.Rock Mechanics and Rock Engineering，2018，51：827-847.
3	Scott J J.Friction rock stabilizers：a new rock reinforcement method［C］//The 17th U.S.Symposium on Rock Mechanics （USRMS）.US Rock Mechanics/Geomechanics Symposium.Snow Bird，1976：ARMA-76-0559.
4	杨海清，周小平，张永兴.管缝式锚杆在拉拔荷载作用下受力分析模型［J］.岩土力学，2007，28（sup1）：236-240.
	Yang Hai‑qing， Zhou Xiao‑ping， Zhang Yong‑xing.Analytical model for split‑set rock bolt under pull‑out force ［J］.Chinese Journal of Rock and Soil Mechanics，2007，28（sup1）：236-240.
5	Komurlu E， Demir S.Length effect on load bearing capacities of friction rock bolts［J］.Periodica Polytechnica Civil Engineering，2019，63（3）：718-725.
6	Davis R L.Split‑set rock bolt analysis ［J］. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts，1979，16（1）：1-10.
7	靖洪文，苏海健，孟波，等.巷道锚杆锚固力学特性现场试验研究［J］.中国矿业大学学报，2022，51（1）：314-321.
	Jing Hong‑wen， Su Hai‑jian， Meng Bo，et al ．Field test research on anchorage mechanical characteristics of roadway bolt ［J］．Journal of China University of Mining and Technology，2022，51（1）：314-321.
8	Komurlu E， Celik A G， Gunes İ.Use of a new insertion apparatus for improving performances of the friction rock stabilizers［J］.Mining，Metallurgy & Exploration，2022，39（2）：413-420.
9	唐春安，赵兴东，王维纲，等.新型全长多点楔胀式管缝锚杆（竹节式锚杆）的试验研究［J］.岩石力学与工程学报，2004，23（3）：465-468.
	Tang Chun‑an， Zhao Xing‑dong， Wang Wei‑gang，et al.Testing study on a new kind of fully‑anchored and multi‑wedge slotted tube bolt （bamboo‑like bolt） researched in laboratory ［J］.Chinese Journal of Rock Mechanics and Engineering，2004，23（3）：465-468.
10	Thompson A G.Rock support and reinforcement practice in mining［M］.London：CRC Press，1999.
11	Ciavatta A.Oblate friction rock stabilizer and installation lubricating cement utilized therewith：4，430，025［P］.1984-02-07.
12	Dayakar P， Raman K V， Raju K V B.Study on permeation grouting using cement grout in sandy soil［J］.IOSR Journal of Mechanical and Civil Engineering，2012，4：5-10.
13	Villaescusa E， Wright J.Permanent excavation support using cement grouted split set bolts［C］//Proceedings International Symposium on Rock Support.Lillehammer：Norwegian Society of Chartered Engineers，1997：660-670.
14	Davison G R， Fuller P G.Investigation of expanding Split Sets［C］//Ground Support 2013：Proceedings of the Seventh International Symposium on Ground Support in Mining and Underground Construction.Perth：Australian Centre for Geomechanics， 2013：163-170.
15	Davison G R.Development of industry‑friendly rockbolts［C］//SHIRMS 2008：Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium.Perth：Australian Centre for Geomechanics，2008：579-587.
16	Li C C.Analysis of inflatable rock bolts［J］.Rock Mechanics and Rock Engineering，2016，49（1）：273-289.
17	Xu S， Yang Z M， Cai M，et al.An experimental study on the anchoring characteristics of an innovative self‑swelling split‑set［J］.Tunnelling and Underground Space Technology，2021，112：103919.
18	Xu S， Hou P Y， Li R R，et al.An experimental study on the mechanical properties and expansion characteristics of a novel self‑swelling cartridge for rock breakage［J］.Rock Mechanics and Rock Engineering，2021，54（2）：819-832.
19	Kim K J， Cho H K， Sohn D W，et al.Prediction of the minimum required pressure of soundless chemical demolition agents for plain concrete demolition［J］.Journal of the Computational Structural Engineering Institute of Korea，2018，31：251-258.
20	De Silva V R S， Ranjith P G， Perera M S A，et al.The effect of saturation conditions on fracture performance of different soundless cracking demolition agents （SCDAs） in geological reservoir rock formations［J］.Journal of Natural Gas Science and Engineering，2019，62：157-170.
21	徐帅，郭玟志，纪旭波，等.基于智能拉拔测试系统的锚杆锚固力现场高效评测方法［J］.金属矿山，2022 （5）：56-61.
	Xu Shuai， Guo Wen‑zhi， Ji Xu‑bo，et al ．Rapid field evaluation of bolt anchoring force based on intelligent pull‑out test system ［J］.Chinese Journal of Metal Mine，2022（5）：56-61.