浸水作用下灰岩缝合线剪切强度劣化机制及等效模拟方法

doi:10.3724/1000-6915.jrme.2024.0933

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摘要灰岩本身较为致密、透水性低，其内部的结构弱面是岩体导水并导致工程失稳与破坏的关键因素。为分析浸水作用下灰岩缝合线构造剪切力学特性的劣化特征与机制，在现场调查的基础上对缝合线进行分类，并制备试样以开展试验研究。结果显示：宽度b＜1 mm的缝合线与完整灰岩类似，浸水的影响主要体现在对黏聚力值的降低上，但降低幅度不大（约11.0%）；而1 mm≤b≤5 mm和b＞5 mm的缝合线在浸水后则主要表现为内摩擦角的减小，且减小率分别达到了21.2%和30.9%。缝合线由两侧的缝合膜和中间的交代白云岩组成，b＜1 mm的缝合线交代白云岩非常少，水分的渗透主要导致缝合膜与基岩之间的黏结力减弱；而1 mm≤b≤5 mm和b＞5 mm的缝合线在浸水后交代白云岩边缘发生溶解，更易发生滑动，从而降低内摩擦角。分析表明交代白云岩的溶解度与内摩擦角的降低非常接近，可用于量化浸水对缝合线的影响。基于此，提出基于缝合线溶解度变化的Interface单元弱化等效模拟方法，该方法计算的变形曲线与破坏过程与试验结果均较为符合，且可以较好模拟出试样在剪切过程中颗粒的摩擦滑动，可为灰岩缝合线的模拟提供一种借鉴和参考。

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	杨超1
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	李天一1
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	王娇1
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	蒋淏南2
	熊赟2
	3
	潘惠雄3

关键词 ：岩石力学, 灰岩缝合线, 剪切力学特性, 浸水作用, 数值模拟

Abstract： Limestone is relatively dense and has low permeability. Its internal structural weak planes act as conduits for water within the rock mass, potentially leading to engineering instability and failure. To examine the degradation characteristics and mechanisms of the shear mechanical properties of limestone stylolite under immersion, the stylolite was categorized based on field investigations, and specimens were prepared for testing. The findings showed that stylolite with a width of b < 1 mm exhibited similar characteristics to limestone. The impact of immersion was primarily evident in the reduction of cohesion, though this decline was not substantial (approximately 11.0%). Stylolite with 1 mm ≤ b ≤ 5 mm and b > 5 mm predominantly demonstrated a decline in the internal friction angle after immersion. The reduction rates reached 21.2% and 30.9%, respectively. The stylolite is composed of suture membranes on both sides and metasomatic dolomite in the middle. Stylolite comprising metasomatic dolomite with a width of b < 1 mm is exceedingly rare. The infiltration of water primarily weakens the bonding force between the membrane and the bedrock. Stylolite with a width of 1 mm ≤ b ≤ 5 mm and b > 5 mm are more susceptible to sliding and a reduction in the internal friction angle after immersion, due to the dissolution of the dolomite at the edges. The analysis demonstrates that the solubility of metasomatic dolomite is closely related to the reduction in the internal friction angle, which can be employed to quantify the impact of immersion on the stylolite. Based on these findings, a simulation method for assessing the weakening of interface units due to changes in suture solubility was proposed. The deformation curve and failure process calculated by this method are in good agreement with the test results and effectively simulate the frictional sliding of particles during the shear process of the sample. This can serve as a reference and a source of guidance for the simulation of limestone sutures.

Key words： rock mechanics limestone stylolite shear mechanical properties immersion effect numerical simulation

引用本文:

杨超1，2，李天一1，2，王娇1，2，蒋淏南2，熊赟2，3，潘惠雄3. 浸水作用下灰岩缝合线剪切强度劣化机制及等效模拟方法[J]. 岩石力学与工程学报, 2025, 44(6): 1438-1449.
YANG Chao1, 2, LI Tianyi1, 2, WANG Jiao1, 2, JIANG Haonan2, XIONG Yun2, 3, PAN Huixiong3. Degradation mechanism and equivalent simulation method of shear strength of limestone stylolite under immersion. , 2025, 44(6): 1438-1449.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0933 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I6/1438

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