双粗糙结构面剪切试验与数值模拟研究

doi:10.13722/j.cnki.jrme.2017.0500

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摘要为了研究压剪状态下结构面间的相互作用与破坏机制，分别采用物理试验及数值模拟方法，对双粗糙结构面的剪切特性进行研究。采用3D打印技术生成可以定量化的PLA材料结构面模具，通过混凝土浇筑PLA模具制得人造结构面。研究发现，通过该方法制作的人造结构面的粗糙度远低于原始结构面，故其粗糙度需在剪切试验前重新测定。双结构面剪切试验结果表明，由于中间夹层岩石的破坏，整体的剪切强度要低于其中任何一条结构面单独剪切的抗剪强度，甚至低于单光滑结构面的剪切强度。同时，采用宏观概化模型策略用PFC2D建立双结构面剪切的颗粒流数值模型，数值模拟结果表明，结构面的粗糙形态引起的应力集中造成了中间夹层岩石破坏，并最终导致了整体剪切强度降低，其中结构面间距对整体强度的影响并不明显。

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	刘溪鸽
	朱万成
	周靖人
	关凯

关键词 ：岩石力学, 双结构面, 剪切试验, 数值模拟, 粗糙度, 剪切强度

Abstract：

In order to explore the interaction between different joints in the pressure-shear condition and the related failure mechanism，the shear resistance performance of double rough joints was studied by using both experimental and numerical simulation methods. The artificial joint samples were generated by pouring concrete into the PLA molds. It is proven that the JRC of the 3D-printed PLA joint surface is seriously reduced，which should be re-calculated before shear tests. The experimental results show that on account of the failure of the interlayer rock during the shear test，the overall shear strength of double rough joints is lower than that of either of the two joints，and even lower than that of the single smooth joint. Moreover，the PFC^2D numerical simulation on shear test of double rough joints shows that the stress concentration induced by the joint asperities leads to the failure of the interlayer rock，which further reduces the shear strength. In addition，the influence of joint spacing on shear strength is not so obvious.

Key words： rock mechanics double joints shear test numerical simulation joint roughness coefficient(JRC) shear strength

引用本文:

刘溪鸽，朱万成，周靖人，关凯. 双粗糙结构面剪切试验与数值模拟研究[J]. 岩石力学与工程学报, 2017, 36(S2): 3831-3840.
刘溪鸽，朱万成，周靖人，关凯. Direct shear tests and numerical simulation of double rough joints. , 2017, 36(S2): 3831-3840.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0500 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3831

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