新型缩管式恒阻大变形锚索动静力学特性及工程应用研究

doi:10.13722/j.cnki.jrme.2022.1304

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摘要深部高应力带来的围岩大变形问题给工程安全带来极大挑战，传统锚索由于无法适应围岩大变形而容易破坏失效。根据钢管挤压变形原理，提出一种新型缩管式高强恒阻大变形锚索，充分利用金属材料塑性挤压变形特性，具有阻力稳定、可控性高和吸能效果好等优点。利用万能试验机、锚索拉伸试验系统和落锤冲击试验系统，研究新型锚索的动/静力学特性。试验结果表明：(1) 静力条件下新型锚索可提供恒定的工作阻力367 kN，允许变形量最大可达694 mm；(2) 抗冲击过程中，缩管式恒阻大变形锚索吸能效果良好，缓冲力保持稳定，单次冲击吸能量最大可达103 kJ。在典型的软岩大变形隧道—渭武高速木寨岭隧道进行工程应用，结果表明，新型锚索能够在允许较大变形量的同时提供较高的支护阻力，安装方便，不干扰现场施工，为解决深部工程中的大变形问题提供新方案。

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	吴学震1
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	王刚2
	蒋宇静1
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关键词 ：岩石力学, 缩管式恒阻大变形锚索, 动静力学特性, 恒阻力, 允许变形量, 现场试验

Abstract：The problem of large deformation of surrounding rock induced by high stresses in the deep stratum poses a great challenge to engineering safety. The typical rock cable would be damaged readily due to its inability to react to the massive deformation of surrounding rock. A new type of steel pipe shrinkable energy-absorbing cable (SPS Cable) was developed based on the principle of steel pipe extrusion and deformation. The SPS Cable fully utilizes the plastic extrusion and deformation characteristics of metal materials and has the advantages of stable resistance，high controllability and good energy absorption effect. The new cable?s dynamic and static mechanical characteristics were investigated by cable tensile testing system and dynamic drop testing system. The test results show that：(1) the SPS Cable can provide a constant working resistance of 367 kN under static conditions，and the maximum allowable deformation can reach 694 mm；(2) When resisting impact loads，the SPS Cable has good energy absorption ability，the buffer force remains stable，and the maximum energy absorption in a single impact can reach 103 kJ. The results reveal that the SPS Cable can offer high support resistance while allowing large deformation. It is very easy to install，and does not interfere with site development. The SPS Cable provided a new solution to deep engineering?s large deformation problems.

Key words： rock mechanics steel pipe shrinkable energy-absorbing cable dynamic and static mechanical characteristics constant resistance allowable deformation field test

引用本文:

吴学震1，叶青1，邓涛1，郑含芳1，王刚2，蒋宇静1，3. 新型缩管式恒阻大变形锚索动静力学特性及工程应用研究[J]. 岩石力学与工程学报, 2023, 42(12): 2888-2897.
WU Xuezhen1，YE Qing1，DENG Tao1，ZHENG Hanfang1，WANG Gang2，JIANG Yujing1，3. Dynamic and static mechanical characteristics and engineering application of a novel steel pipe shrinkable energy-absorbing cable. , 2023, 42(12): 2888-2897.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1304 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I12/2888

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