变饱和度条件下粗糙岩石节理剪切强度特性的试验研究

doi:10.13722/j.cnki.jrme.2021.0734

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摘要为探究节理剪切性质随饱和度变化的演变规律，首先采用三维激光扫描技术和3D打印技术相结合的手段，通过将水泥、砂、粉煤灰和水按1∶3∶0.4∶0.55的配比混合，从而复刻出3种不同粗糙度的类岩石节理，并根据计算得到的节理空隙体积对饱和度进行控制，随后采用自主研发的岩石直剪试验系统，对3种粗糙度的复刻节理开展了在常法向应力(0.2 MPa)和变饱和度条件下的直剪试验。试验结果表明，饱水时3种粗糙度的节理试样峰值剪切强度平均降低28.4%，不同粗糙度下峰值剪切强度分别降低35.7%(JRC = 12.9)，28.5%(JRC = 10.1)和16.1%(JRC = 7.3)。此外，随着饱和度的增大，节理残余剪切强度亦逐渐下降，降低幅度为7%～12%，其下降程度同样与粗糙度相关。通过进一步的分析表明：水的力学作用和对粗糙节理面的浸润作用是引起其剪切强度弱化的主要原因；随着粗糙度的增加，水–岩相互作用的面积增大，水对节理剪切强度的弱化程度相应地增强。所揭示的抗剪强度随饱和度增加而显著弱化的现象表明，对岩体工程进行设计时除了考虑水的影响外，还应对含水量(饱和度)可能导致的剪切强度弱化进行量化分析。

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	胡云进1
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	王小宇1
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	钟振1
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	杨申东1
	2
	3
	宋忠阳1
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关键词 ：岩石力学, 剪切强度, 饱和度, 节理粗糙度, 岩石节理, 水&ndash, 岩作用

Abstract：In order to investigate the change of the shear strength of rock joints with saturation，artificial rock joints with various roughness were reproduced by mixing cement，sand，fly ash and water at a mass ratio of 1∶3∶0.4∶0.55 based on 3D-laser scanning and 3D-printing technologies，and the saturation of the joints was controlled according to the calculated joint void volume. Subsequently，a series of direct shear tests were carried out on the reproduced joints with various roughness and saturations under a constant normal stress of 0.2 MPa. Experimental results indicate that the average peak shear strength of rock joints decreases by 28.4% when the saturation increases from 0 % to 100 %，and the peak shear strength of the rock joints with a JCR of 12.9，10.1 and 7.3 respectively decreases by 35.7%，28.5% and 16.1%. Besides，the residual shear strength also reduces with increasing the saturation，and the reductions dependent on the joint roughness range from 7%–12%. Further analysis shows that the weakening of the shear strength of rock joints arises from the mechanical effect and lubricating effect of water exerted on the rough joint surface，and that，as the joints get rougher，the water-rock interaction area becomes greater，inducing a higher deterioration in mechanical properties. According to the findings from this study，it is emphasized that the effect of the water saturation on the degradation of the shear strength should be analyzed when designing rock mass projects.

Key words： rock mechanics shear strength saturation joint roughness coefficient rock joints water-rock interactions

引用本文:

胡云进1，2，3，王小宇1，2，3，钟振1，2，3，杨申东1，2，3，宋忠阳1，2，3. 变饱和度条件下粗糙岩石节理剪切强度特性的试验研究[J]. 岩石力学与工程学报, 2022, 41(2): 336-345.
HU Yunjin1，2，3，WANG Xiaoyu1，2，3，ZHONG Zhen1，2，3，YANG Shendong1，2，3，SONG Zhongyang1，2，3. Experimental study on shear strength of rough rock joints under various saturations. , 2022, 41(2): 336-345.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0734 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I2/336

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