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DOI: https://doi.org/10.11988/ckyyb.20241306

基于循环加卸载宏观压入实验的岩石弹性模量测定方法研究

  • 呼怀刚 , 1, 2 ,
  • 杨阳 , 3, 4 ,
  • 凌贤伍 1, 2 ,
  • 纪国栋 1, 2 ,
  • 刘科 1, 2 ,
  • 胡大伟 3, 4 ,
  • 周辉 3, 4
展开
  • 1.中国石油集团工程技术研究院有限公司，北京102206
  • 2.油气钻完井技术国家工程研究中心，北京102206
  • 3.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室， 武汉 430071
  • 4.中国科学院大学，北京 100049
杨 阳（2000-），男，江苏宿迁人，博士研究生，主要从事深部地热开采方面的研究工作。E-mail：

呼怀刚（1988-），男，山东济阳人，博士，高级工程师，主要从事高效破岩、钻井提速、钻井工程规划与技术支持方面的研究工作。E-mail:

收稿日期: 2024-12-30

  修回日期: 2025-04-22

  网络出版日期: 2025-06-03

基金资助

中国石油集团直属院所项目(CPET2022-10S)

油气钻完井技术国家工程研究中心科学研究基金项目(NERCDCT202312)

中国石油集团公司重大科技专项(2023ZZ20)

中国石油集团公司关键核心技术攻关项目(2022ZG06)

收起

Research on the Determination Method of Rock Elastic Modulus Based on Cyclic Loading-Unloading Macro-indentation Experiments

  • HU Huai-gang , 1, 2 ,
  • YANG Yang , 3, 4 ,
  • LING Xian-wu 1, 2 ,
  • JI Guo-dong 1, 2 ,
  • LIU Ke 1, 2 ,
  • HU Da-wei 3, 4 ,
  • ZHOU Hui 3, 4
Expand
  • 1. CNPC Engineering Technology R&D Company Limited, Beijing 102206, China
  • 2. National Engineering Research Center for Oil & Gas Drilling and Completion Technology, Beijing 102206, China
  • 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • 4. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2024-12-30

  Revised date: 2025-04-22

  Online published: 2025-06-03

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摘要

针对深部岩石工程中传统力学实验存在的取芯困难、数据离散性大等问题，本研究提出一种基于循环加卸载压入实验测定岩石弹性模量的方法。通过在单个压点开展循环压入，获取丰富的加卸载力-位移曲线，结合Oliver-Pharr理论计算弹性模量，并系统探究最大载荷、加载速率和保载时间对致密砂岩弹性模量测量结果的影响。实验结果表明：较大的压入载荷会导致计算结果偏大；加载速率对结果影响较小，低加载速率有助于降低测试误差；较长的保载时间可使计算结果更平稳。综合分析得出，采用最大载荷50N、加载速率0.03mm/min、保载时间10s的实验条件时，压入弹性模量与单轴压缩基准值误差最小，数据稳定性最佳。与传统压痕实验相比，该方法实验流程简便高效，数据获取丰富，结果曲线平滑稳定，准确率更高，无需完整岩芯，可利用钻井岩屑快速测试，为深部岩石工程设计和施工提供了准确的岩石力学参数，具有重要的工程应用价值。

关键词： 毫米压痕测试; Oliver-Pharr理论; 致密砂岩; 弹性模量

本文引用格式

呼怀刚 , 杨阳 , 凌贤伍 , 纪国栋 , 刘科 , 胡大伟 , 周辉 . 基于循环加卸载宏观压入实验的岩石弹性模量测定方法研究[J]. 长江科学院院报, 2025 . DOI: 10.11988/ckyyb.20241306

Abstract

In view of the problems of difficult coring and large data discreteness in traditional mechanical experiments for deep rock engineering, this study proposes a method for determining the elastic modulus of rocks based on cyclic loading-unloading indentation tests. By conducting cyclic indentation at a single indentation point, abundant loading-unloading force-displacement curves are obtained. The elastic modulus is calculated in combination with the Oliver-Pharr theory, and the influences of the maximum load, loading rate, and load-holding time on the measurement results of the elastic modulus of tight sandstone are systematically investigated. The experimental results show that a larger indentation load will lead to a relatively larger calculated result; the influence of the loading rate on the results is relatively small, and a lower loading rate helps to reduce the testing error; a longer load-holding time can make the calculated results more stable. Through comprehensive analysis, it is concluded that when the experimental conditions of a maximum load of 50 N, a loading rate of 0.03 mm/min, and a load-holding time of 10 s are adopted, the error between the indentation elastic modulus and the uniaxial compression reference value is the smallest, and the data stability is the best. Compared with traditional indentation experiments, this method has a simple and efficient experimental process, rich data acquisition, smooth and stable result curves, higher accuracy. It does not require a complete rock core and can be quickly tested using drilling cuttings, providing accurate rock mechanical parameters for the design and construction of deep rock engineering, and thus has important engineering application value.

Key words： mm-indentation test; Oliver-Pharr theory; tight sandstone; elastic modulus

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