| 引用本文: | 张亦海,乔兰,李远.基于非线弹性CSIRO地应力测量技术及应用[J].哈尔滨工业大学学报,2019,51(8):136.DOI:10.11918/j.issn.0367-6234.201805065 |
| ZHANG Yihai,QIAO Lan,LI Yuan.In-situ stress measurement technique based on non-linear elastic CSIRO and its application[J].Journal of Harbin Institute of Technology,2019,51(8):136.DOI:10.11918/j.issn.0367-6234.201805065 |
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| 摘要: |
| 在地下工程的中尤其深部工程,地应力是指导开挖的重要参数之一,因此,地应力测量工作至关重要.CSIRO地应力测量法是国际岩石力学学会推荐的地应力测量方法之一.针对三山岛金矿深部巷道近千米花岗岩钻机取芯,精密加工成标准圆柱试件,进行单、三轴压缩试验,获取霍克布朗-准则强度准则曲线,重点设计单岩样多围压阶梯弹性段加载试验.通过试验数据计算获得岩石弹性模量和泊松比等物理力学参数,引入体积模量K和剪切模量G等变形参量,且随平均应力不断增大成非线性变化的关系,应用双曲线函数模型建立变形参量与平均应力的本构关系K/G=K0/G0+Pb+a×P.公式中K0/G0为初始变形模量,K0/G0+1/a为平均应力无限大时趋近值,1/b为变形模量初始增长率,三参数都具有明确的物理意义.基于此公式推导考虑岩石非线弹性变形特征的CSIRO地应力测量法中高压双轴公式,通过三山岛金矿深部花岗岩解除岩芯高压双轴加载试验验证此公式的适用性. |
| 关键词: 非线弹性 深部岩体 空心包体 地应力测量 双轴试验 |
| DOI：10.11918/j.issn.0367-6234.201805065 |
| 分类号:U441.3 |
| 文献标识码:A |
| 基金项目:国家重点研发计划项目(2016YFC0600703) |
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| In-situ stress measurement technique based on non-linear elastic CSIRO and its application |
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ZHANG Yihai,QIAO Lan,LI Yuan
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(School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)
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| Abstract: |
| In underground engineering, especially in deep excavation engineering, in-situ stress is one of the important parameters of the guiding excavation, thus the measurement of in-situ stress is crucial. The CSIRO in-situ stress measurement method is recommended by the International Society for Rock Mechanics. The deep granite of the Sanshandao Gold Deposit was processed into standard cylindrical specimens. The Hoek-Brown strength criterion curve was obtained by uniaxial and triaxial compression tests. A single rock sample multi-confining pressure step loading test considering multiple confining pressures was designed. Physical parameters such as elastic modulus and Poisson’s ratio were obtained by calculation of experiment data. Deformation parameters including bulk modulus K and shear modulus G were introduced, and the mean stress increased following a non-linear manner. The constitutive relation between the bulk modulus and shear modulus vs. mean stress was fitted by the hyperbolic function K/G=K0/G0+Pb+a×P, where K0/G0 is the initial modulus of deformation, K0/G0+1/a is approach value of mean stress at limit, 1/b is initial growth rate of deformation modulus, all of which have clear physical meanings. Based on this formula, the high-pressure biaxial formula in the CSIRO in-situ stress measurement method which considers the non-linear elastic deformation of rock was deduced, and its applicability was verified by rock core removal high pressure biaxial loading test conducted on the deep granite of Sanshandao Gold Deposit. |
| Key words: non-linear elastic deep rock CSIRO in-situ stress measurement biaxial pressurization test |
