基于颗粒流的天然多形貌充填节理剪切特性研究
PDF下载 (162)朱跨丰,罗战友,吴 强,吴 晖,李 干.基于颗粒流的天然多形貌充填节理剪切特性研究[J].宁波大学学报(理工版),2024,37(5):35-40.DOI:10.20098/j.cnki.1001-5132.2024.0133
ZHU Kuafeng,LUO Zhanyou,WU Qiang,WU Hui,LI Gan.The shear characteristics of fill joints in natural polyhedral morphology based on particle flow[J].Journal of Ningbo University(Natural Science & Engineering Edition),2024,37(5):35-40.DOI:10.20098/j.cnki.1001-5132.2024.0133
| Title: | The shear characteristics of fill joints in natural polyhedral morphology based on particle flow |
| 作者: | 朱跨丰, 罗战友, 吴 强, 吴 晖, 李 干 |
| Author(s): | ZHU Kuafeng, LUO Zhanyou, WU Qiang, WU Hui, LI Gan |
| 关键词: | 充填节理; 抗剪强度; 剪切特性; 数值模拟; 起伏形貌 |
| Keywords: | filling joint; shear strength; shear properties; numerical simulation; undulating morphology |
| 分类号: | TU43 |
| DOI: | 10.20098/j.cnki.1001-5132.2024.0133 |
| 文献标识码: | A |
| 摘要: | 节理剪切特性是影响岩体稳定性的重要因素, 因此根据天然原岩节理起伏形貌曲线, 采用颗粒流数值计算方法开展了天然多形貌无充填及充填厚度为15 mm和75 mm的节理剪切特性试验, 分析节理起伏形貌和充填厚度对剪切特性及抗剪强度的影响. 研究结果表明: (1)随着充填厚度的增大, 起伏形貌对节理峰前硬化、峰后软化的峰值特征影响降低, 峰后软化程度下降. (2)同起伏形貌的节理随着充填厚度的增大, 试样由节理剪切破坏向软弱夹层剪切破坏过渡. 充填度小于2时, 主要是节理剪切破坏和节理-夹层耦合破坏; 充填度大于2时, 主要发生软弱夹层剪切破坏. (3)充填度小于2时, 结构面峰值抗剪强度随充填度增大呈减小规律; 当充填度大于2时, 结构面峰值抗剪强度无明显变化. |
| Abstract: | The shear characteristics of joints is an important factor affecting the stability of rock masses. Based on the natural joint surface undulation profiles, numerical simulations using the Discrete Element Method (DEM) are conducted to investigate the shear characteristics of joints with natural and filled surfaces at thicknesses of 15mm and 75mm. The study analyzes the effects of joint undulation and filling thickness on shear characteristics and shear strength. The research findings indicate the following: (1) With the increase in filling thickness, the influence of undulation on the peak hardening and post-peak softening features of joints decreases, and the degree of post-peak softening decreases; (2) For joints with the same undulation profile, as the filling thickness increases, the failure mode transitions from joint shear failure to shear failure in the weak interlayer. When the filling ratio is less than 2, the primary failure modes are joint shear failure and joint-interlayer coupling failure. When the filling ratio is greater than 2, the predominant failure mode is shear failure in the weak interlayer; (3) When the filling ratio is less than 2, the peak shear strength of the structural surface decreases with the increase in filling ratio. However, when the filling ratio is greater than 2, there is no significant change in the peak shear strength of the structural surface. |
| 参考文献 /References: | [1].SHRIVASTAVA A K, RAO K S. Physical modeling of shear behavior of infilled rock joints under CNL and CNS boundary conditions[J]. Rock Mechanics and Rock Engineering, 2018, 51(1):101-118. [2].INDRARATNA B, PREMADASA W, BROWN E T. Shear behaviour of rock joints with unsaturated infill[J]. Geotechnique, 2013, 63(15):1356-1360. [3].MIRZAGHORBANALI A, NEMCIK J, AZIZ N. Effects of cyclic loading on the shear behaviour of infilled rock joints under constant normal stiffness conditions[J]. Rock Mechanics and Rock Engineering, 2014, 47(4):1373-1391. [4].HAN G S, JING H W, JINAG Y J, et al. Effect of cyclic loading on the shear behaviours of both unfilled and infilled rough rock joints under constant normal stiffness conditions[J]. Rock Mechanics and Rock Engineering, 2020, 53(1):31-57. [5].刘婷婷, 李建春, 李海波, 等. 剪切速率对平直充填节理的剪切力学特性影响研究[J]. 岩土力学, 2017, 38(7): 1967-19731989. [6].肖维民, 余欢, 李锐, 等. 薄层充填岩石节理抗剪强度特性试验研究[J]. 岩石力学与工程学报, 2019, 38(增刊2):3420-3428. [7].何忠明, 彭振斌, 曹平, 等. 层状岩体单轴压缩室内试验分析与数值模拟[J]. 中南大学学报(自然科学版), 2010, 41(5):1906-1912. [8].连莲, 张书博, 王扬等. 不同充填厚度节理面剪切破坏宏细观机理研究[J]. 广西大学学报(自然科学版), 2019, 44(3):756-764. [9].王刚, 张振松, 张贤达 等. 异形充填节理剪切破坏宏细观机理及强度模型[J]. 河南理工大学学报(自然科学版), 2020, 39(1):133-140 [10].许万忠, 林杭, 曹日红. 充填粗糙节理直剪数值模拟宏细观分析[J]. 西南交通大学学报, 2018, 53(3):548-557. [11].KARAKUS M, LIU Y, ZHANG G C, et al. A new shear strength model incorporating influence of infill materials for rock joints[J]. Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2016, 2(3):183-193. [12].DURIEZ J, DARVE F, DONZÉ F V. A discrete modeling-based constitutive relation for infilled rock joints[J]. International Journal of Rock Mechanics and Mining Sciences, 2011, 48(3):458-468. [13].宋浪, 柴少波, 宋博阳, 等. 充填节理特性对岩石静态压缩力学行为影响的颗粒流模拟[J]. 中山大学学报(自然科学版)(中英文), 2023, 62(5):145-156. [14].黄达, 岑夺丰. 单轴静-动相继压缩下单裂隙岩样力学响应及能量耗散机制颗粒流模拟[J]. 岩石力学与工程学报, 2013, 32(9):1926-1936. [15].PARK J W, SONG J J. Numerical simulation of a direct shear test on a rock joint using a bonded-particle model [J]. International Journal of Rock Mechanics and Mining Sciences, 2009, 46(8):1315-1328. [16].Itasca Consulting Group. PFC2D (partical flow code in 2 dimensions) theory and background[M]. Minneapolis, USA: Itasca Consulting Group Inc, 2002: 77-78. [17].BAHAADDINI M, HAGAN P C, MITRA R, et al. Parametric study of smooth joint parameters on the shear behaviour of rock joints[J]. Rock Mechanics and Rock Engineering, 2015, 48(3):923-940. [18].王刚, 张学朋, 蒋宇静, 等. 基于颗粒离散元法的岩石节理面剪切破坏细观机理[J]. 中南大学学报(自然科学版), 2015, 46(4):1442-1453. [19].BARTON N. Suggested methods for the quantitative description of discontinuities in rock masses[J]. International Journal of Rock Mechanics and Mining Sciences, 1978, 15(6):319-368. |
| 备注/Memo: | 收稿日期: 2024−01−24. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（42277147）. 第一作者: 朱跨丰, 硕士研究生, 主要研究方向: 岩体结构面. E-mail: 1026721376@qq.com *通信作者: 罗战友, 教授, 主要研究方向: 岩体结构面、隧道及桩基工程. E-mail: lzy0395@163.com 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
