Mechanical properties of soft-hard interbedded rock mass with different damage degrees under cyclic loading-unloading and drying-wetting cycles

MIAO Shuaisheng; SU Lijun; HU Bingli

doi:10.11835/j.issn.2096-6717.2024.093

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Mechanical properties of soft-hard interbedded rock mass with different damage degrees under cyclic loading-unloading and drying-wetting cycles

Civil Engineering | 更新时间：2026-03-30

- Mechanical properties of soft-hard interbedded rock mass with different damage degrees under cyclic loading-unloading and drying-wetting cycles
- Journal of Civil and Environmental Engineering Vol. 48, Issue 2, Pages: 40-50(2026)
- 作者机构：
  
  1.中国科学院山地自然灾害与工程安全全国重点实验室；中国科学院、水利部成都山地灾害与;环境研究所，成都 610299
  2.中国科学院大学，北京 100049
  3.中巴地球科学联合研究中心
  4.伊斯兰堡，信阳师范大学建筑与土木工程学院，河南信阳 464000
- 作者简介：
  
  MIAO Shuaisheng (1995- ), PhD candidate, main research interest: slope stability analysis, E-mail: mshuaishe@imde.ac.cn.
  SU Lijun （corresponding author）， professor， doctorial supervisor， E-mail： sulijun1976@163.com.
- 基金信息：
  
  National Natural Science Foundation of China(U22A20603);National Key Research and Development Program of China(2023YFC3008300)
- DOI：10.11835/j.issn.2096-6717.2024.093
  CLC： TU452
- Received：25 July 2024，
  
  Published：25 April 2026
- 稿件说明：
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苗帅升,苏立君,胡兵立.循环加卸载与干湿循环后不同损伤度软硬互层岩体力学特性试验研究[J].土木与环境工程学报,2026,48(02):40-50.

MIAO Shuaisheng,SU Lijun,HU Bingli.Mechanical properties of soft-hard interbedded rock mass with different damage degrees under cyclic loading-unloading and drying-wetting cycles[J].Journal of Civil and Environmental Engineering,2026,48(02):40-50.
苗帅升,苏立君,胡兵立.循环加卸载与干湿循环后不同损伤度软硬互层岩体力学特性试验研究[J].土木与环境工程学报,2026,48(02):40-50. DOI： 10.11835/j.issn.2096-6717.2024.093.

MIAO Shuaisheng,SU Lijun,HU Bingli.Mechanical properties of soft-hard interbedded rock mass with different damage degrees under cyclic loading-unloading and drying-wetting cycles[J].Journal of Civil and Environmental Engineering,2026,48(02):40-50. DOI： 10.11835/j.issn.2096-6717.2024.093.

摘要

探究具有不同初始损伤的软硬互层岩体的力学性质，对于评估震后损伤岩体在周期性干湿循环交替环境下的稳定性极为关键。以变质砂岩和千枚岩互层岩体为研究对象，通过循环加卸载试验和干湿循环试验，制备具有不同初始损伤程度的试样，然后开展单轴压缩试验，分析不同初始损伤试样的变形破坏特征、裂纹演化过程、强度劣化规律，探究试样破坏的前兆特征，并从微观角度揭示试样的损伤劣化机制。结果表明：变形差异系数能量化试样表面不同区域的变形差异；穿晶裂纹和晶间裂纹的扩展贯穿整个加载过程，其破裂形式主要以张拉破裂为主，剪切破裂占比的增加会引起RA/AF值变异系数

的增大，当

增大至6.5时，试样临近破坏；试样的剪切破坏模式主要受岩体结构特征的控制，初始损伤则影响试样的破裂类型和裂纹的发育特征；初始损伤会引起弹性模量、抗压强度和破坏位移的下降；微裂纹的增多、颗粒间胶结作用的减弱是导致岩体宏观力学性能劣化的根本原因。

Abstract

Exploring the mechanical properties of soft-hard interbedded rock mass with different initial damages is crucial for assessing the stability of post-seismic damaged rock masses under cyclic drying and wetting conditions. Taking the interbedded rock mass of metasandstone and phyllite as a research object

the samples with different initial damage degrees were prepared through cyclic loading and unloading tests followed by cyclic drying and wetting tests. Subsequently

uniaxial compression tests were conducted to investigate the deformation and failure characteristics

crack evolution process

and strength degradation laws of samples with different initial damage degrees

to explore the precursor information of sample failure

and to reveal the damage degradation mechanism from a micro perspective. The results indicate that the deformation difference coefficient can quantify the discrepancies in deformation across different areas of the sample surface. The propagation of transcrystalline cracks and intercrystalline cracks extends throughout the loading process

with tensile fracturing being the primary mode of failure. The increase in the proportion of shear fractures will cause an increase in the coefficient of

variation (

) of the RA/AF values. When the

reaches 6.5

the sample is approaching failure. The shear failure mode of the sample is primarily governed by the structural features of the rock mass

while initial damage influences the type of failure and the development of cracks. Initial damage leads to a decrease in elastic modulus

compressive strength

and failure displacement. The increase in microcracks and the weakening of interparticle bonding are the fundamental causes of the deterioration of the rock mass’s macroscopic mechanical properties.

关键词

Keywords

references

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