结构面表面起伏体对抗剪强度的贡献与影响研究

doi:10.13722/j.cnki.jrme.2023.1001

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摘要为深入分析表面起伏体在不同剪切应力条件下的力学响应特征，采用UDEC软件模拟分析17组不同锯齿组合的结构面在不同法向应力条件下的力学行为与剪损特征，并通过室内试验进行对比验证。结果表明：附齿个数、锯齿高度比对结构面峰值抗剪强度的综合影响呈正相关趋势，但在达到一定程度后相关性减弱，且受法向应力影响；法向应力增大将减弱附齿个数与锯齿高度比对结构面剪胀特性提升的贡献；仅考虑最大起伏体的结构面粗糙度系数(JRC)计算方法仅适用于较低法向应力条件；含附齿的锯齿结构面在直剪试验过程中存在4种主要破坏类型。通过响应面分析，拟合得到考虑附齿的锯齿结构面JRC计算模型，与试验结果的误差小于10%。该研究揭示不同大小表面起伏体在结构面抗剪强度中的响应特征，可为工程实践应用和进一步探索采用起伏幅度研究结构面粗糙度提供对比参考。

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	田钱钱1
	雍睿2
	钟祯2
	曹泽敏1
	安鹏举2

关键词 ：岩石力学, 锯齿结构面, 表面起伏体, 剪切特性, 结构面粗糙度系数, 数值模拟

Abstract：To analyze the mechanical response of surface asperities under different shear stress conditions，the UDEC software was employed to simulate and analyze the mechanical behavior and wear characteristics of 17 groups of rock joints with various sawtooth asperities under varying normal stresses. The findings were validated through laboratory tests. The results show that the effects of the attached sawtooth number and the sawtooth height ratio on the peak shear strength of rock joints initially show a positive correlation，but the correlation weakens after reaching a certain level，and are also affected by normal stress conditions. The increase of normal stress will weaken the contribution of the attached sawtooth number and the sawtooth height ratio to the improvement of shear dilation of rock joints. The joint roughness coefficient(JRC) calculation method considering only the maximum undulating asperity is only applicable under low normal stress conditions. It is also observed that there are four main failure types in direct shear tests for the rock joints with various sawtooth asperities. By conducting response surface analysis，a JRC calculation model for the sawtooth rock joints was derived with an error of less than 10% compared to experimental results. This study reveals the mechanical responses of rock joints with various sawtooth asperities，providing a comparative reference for engineering practice and further exploration of using asperity amplitude in characterizing rock joint roughness.

Key words： rock mechanics sawtooth rock joints surface asperities shear characteristics joint roughness coefficient numerical simulation

引用本文:

田钱钱1，雍睿2，钟祯2，曹泽敏1，安鹏举2. 结构面表面起伏体对抗剪强度的贡献与影响研究[J]. 岩石力学与工程学报, 2024, 43(S2): 3771-3778.
TIAN Qianqian1，YONG Rui2，ZHONG Zhen2，CAO Zemin1，AN Pengju2. Study on the contribution and influence of surface asperities of rock discontinuities on shear strength. , 2024, 43(S2): 3771-3778.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1001 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS2/3771

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