Determining 3D in-situ stress with a new borehole deformeter by single overcore

HU Bin; ZHANG Guang; LI Guang-yu

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Determining 3D in-situ stress with a new borehole deformeter by single overcore

更新时间：2026-06-25

- Determining 3D in-situ stress with a new borehole deformeter by single overcore
- Vol. 27, Issue 5, (2006)
- 作者机构：
  
  1. 中国科学院武汉岩土力学研究所,武汉,430071
  2. 中国地质大学工程学院,武汉,430074
  3. 武汉理工大学资源与环境工程学院,武汉,430070
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU413
- Online First：05 November 2013，
  
  Published：2006
- 稿件说明：
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HU Bin, ZHANG Guang, LI Guang-yu. Determining 3D in-situ stress with a new borehole deformeter by single overcore[J]. 2006, 27(5).
DOI：

HU Bin, ZHANG Guang, LI Guang-yu. Determining 3D in-situ stress with a new borehole deformeter by single overcore[J]. 2006, 27(5). DOI：

摘要

基于岩体初始地应力测量的套钻应力解除方法，在36-2型钻孔变形计的基础上增加8个轴向变形测量装置，优化设计加工成12分量新型钻孔变形计。该变形计具有8个轴向变形测量元件和4个径向变形测量元件。试验室内元件标定的结果表明，每个测量元件的分辨率可达0.000 1 mm，精度达到2 ‰；多项室内整体标定试验表明，该变形计应力测量稳定性和可靠性较好，分辨率可达0.028 MPa(当E=30 GPa时)，实测误差小于10 %；在利用设计出的专用金刚石钻头钻取的钻孔中，安装该变形计，只需要一次套钻应力解除试验就可以确定测点部位的三维地应力状态。该地应力测试设备和方法解决了传统的利用3个钻孔套钻解除确定三维地应力的弊端，并可进行深孔测试。具有操作方便、精度高、可靠性好的特点。

Abstract

Based on the overcore method used in measuring initial geostress of rockmass and the borehole deformeter 36-2

a new twelve components borehole deformeter is devised. Compared with the former 36-2 borehole deformeter

which has only four radial deforming measurement elements

the new type has eight more axial elements. Its sensitivity and accuracy is each 0.0001mm and 2‰. A great number of calibration tests in laboratory manifest its sensitivity for stress measurement will reach 0.028MPa (while E=30Gpa). The deviation between true stress and measured stress is not greater than 10%.Using the twelve components late-model borehole deformation gauge

you will obtain three-dimensional stress (or total stress) state of one point only by once overcore test. This test equipment successfully overcomes the disadvantage of measuring three-dimensional geostress with the traditional thrice overcore test; and it enables remarkable economic benefit

convenient operation and higher reliability.

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