侧限下原状碎裂岩样压缩变形响应的解析计算原理与方法

doi:10.13722/j.cnki.jrme.2022.0984

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摘要碎裂岩是发育于强烈构造地带的软弱性或松弛性特殊类岩体，扰动或弱约束对其工程力学特性影响极大。然而，碎裂岩原状样取样困难，且室内难以准确测得其力学性能参数。为此，采用研发的原状碎裂岩现场取样与制样装置及方法，将取得的碎裂岩原状样进行侧限下的压缩变形响应试验，建立侧限圆筒内、外壁轴向剪应力线性分布假设下的计算模型，推导得到高应力侧限压缩下碎裂岩综合压缩模量和等效泊松比的解析解，同时进行碎裂岩侧限压缩数值试验及现场承压板试验。结果表明：钢筒内试样的声波波速与取样点处的声波波速相比差异不超5%，带刃脚钢筒器具取得的碎裂岩原状样基本保持了其原位的结构特征；不同高度测点轴向应变计算值和实测值平均相差不超6.43%，验证了计算模型轴向剪应力线性分布假设的合理性；现场实测变形模量与解析压缩模量之比在岩石压力小于15.80 MPa和大于15.80 MPa时分别为0.17和0.36；解析计算得到的综合压缩模量和泊松比与数值解平均相对差值分别为5.68%和4.18%，验证了侧限下原状碎裂岩样压缩变形响应解析计算方法的可靠性。研究成果为碎裂岩力学性能测试提供了一种有效的方法，对指导碎裂岩地区工程建设具有重要的理论和实践价值。

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	张晋1
	邓荣贵1
	钟志彬2
	刘远程1
	吴沛沛3
	戚绍礼4
	王园园1

关键词 ：岩石力学, 碎裂岩原状样, 侧限压缩试验, 碎裂岩变形响应, 综合压缩模量, 解析计算

Abstract：Cataclastic rocks are a special kind of weak rock mass developed in a strong tectonic zone，whose engineering mechanical properties are greatly influenced by disturbance or weak constraint. However，it is difficult to obtain undisturbed specimens of cataclastic rocks and to accurately measure its mechanical properties in the laboratory. Therefore，the confined compression test of undisturbed specimens which are obtained by investigating the in-situ undisturbed sampling devices and methods is done. The calculation model is established on the assumption of the linear axial shear stress along cylinder. Subsequently，the analytical solutions of deformation parameters under high stress by confined compression are derived. Moreover，the confined compression numerical test and the in-situ bearing plate test are conducted. The results show that：The variation range of acoustic velocity between specimens and sampling points is less than 5%，thus indicating that specimens obtained by steel cylinder devices with blades can basically keep their original structure characteristics. The average differences between calculated values and measured values of axial strain at different heights do not exceed 6.43%，which verifies the rationality of the distribution assumption of axial shear stress in the calculation model. The ratio of in-situ deformation modulus to analytical compression modulus are 0.17 and 0.36 respectively，when the rock pressure are less than and greater than 15.80 MPa. The average differences of comprehensive compression modulus and Poisson?s ratio between the analytical calculation and the numerical solution are 5.68% and 4.18% respectively，which verifies the reliability of the analytical calculation method for the compression deformation response. The research results can provide an effective method for testing the mechanical properties of cataclastic rocks，thus creating theoretical and practical values for the engineering construction of similar areas.

Key words： rock mechanics undisturbed specimens of cataclastic rocks confined compression test deformation response of cataclastic rocks comprehensive compression modulus analytical calculating

引用本文:

张晋1，邓荣贵1，钟志彬2，刘远程1，吴沛沛3，戚绍礼4，王园园1. 侧限下原状碎裂岩样压缩变形响应的解析计算原理与方法[J]. 岩石力学与工程学报, 2023, 42(7): 1695-1708.
ZHANG Jin1，DENG Ronggui1，ZHONG Zhibin2，LIU Yuancheng1，WU Peipei3，QI Shaoli4，WANG Yuanyuan1. Analytical calculating method for compression deformation response of undisturbed cataclastic rocks under lateral confinement #br#. , 2023, 42(7): 1695-1708.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0984 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I7/1695

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