Study on the mechanical properties of core about borehole strain meters based on uniaxial compression experiment
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摘要: 采用室内岩石力学试验方法—单轴压缩试验，对江苏省钻孔应变仪岩芯试样进行单轴压缩试验，通过应力-应变曲线特征和变形特性获取了钻孔岩芯的力学参数，定量化地了解和掌握钻孔岩芯性质；在观测资料的基础上计算面应变耦合系数，对比研究试样的单轴抗压强度和弹性模量与面应变耦合系数的关系。结果表明，弹性模量E对面应变耦合系数A有显著的影响，随着岩石弹性模量的增大，面应变耦合系数呈线性增长，二者具有很好的相关性。Abstract: First, using uniaxial compression experiment to the borehole cores of body strain meters in Jiangsu, based on the stress strain curve and characteristics of deformation to obtain the mechanical properties of strain meters borehole core quantitatively. Second, using analysis method to calculate coupling coefficient of the plane strain so as to obtain the relationship between coupling coefficient of the plane strain and the mechanical properties. We observe the effects between coupling coefficient of the plane strain and the uniaxial compressive strength and elastic modulus. The results show that the elastic modulus of borehole has obvious influence on coupling coefficient of the plane strain, and with the increase of coupling coefficient of the plane strain, the elastic modulus of rock increase in linear, and the two have a good correlation. The main factor of the mechanical properties of borehole leads to the great difference of coupling coefficient of the plane strain for borehole strain.
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图 3 单轴压缩条件下灰岩应力-应变曲线
Figure 3. Stress-strain curves of limestone samples in uniaxial compression experiment
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图 6 单轴压缩条件下片麻岩应力-应变曲线
Figure 6. Stress-strain curves of gneiss samples in uniaxial compression experiment
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图 4 单轴压缩条件下安山岩应力-应变曲线
Figure 4. Stress-strain curves of andesite samples in uniaxial compression experiment
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图 5 单轴压缩条件下砂岩应力-应变曲线
Figure 5. Stress-strain curves of sandstone samples in uniaxial compression experiment
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图 7 耦合系数A与单轴抗压强度R之间的关系
Figure 7. The relationship between the uniaxial compressive strength R and coupling coefficient A of the plane strain
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图 8 耦合系数A与弹性模量E之间的关系
Figure 8. The relationship between modulus E and coupling coefficient A of the plane strain
表 1 取样岩芯深度、尺寸及岩石名称
Table 1 The depth, size and properties of rock samples
岩石
属性钻孔
编号组号 取样
深度/m试样尺寸/mm 直径 高度 灰岩 JS01 1 51 31.23 108.35 2 31.23 106.74 JS02 3 87 31.23 61.21 4 31.23 28.97 安山岩 JS03 5 50 31.50 116.61 6 31.50 113.50 JS04 7 60 31.50 116.46 8 31.50 115.77 砂岩 JS05 9 44 31.50 82.36 10 31.50 94.81 JS06 11 60 31.50 113.15 12 31.50 110.83 片麻岩 JS07 13 61 31.23 59.45 14 41.59 46.41 
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表 2 各岩样的力学参数
Table 2 The mechanical parameters of rock samples
钻孔编号 组号 抗压强度R/MPa 弹性模量E/GPa JS01 1 108.78 23.1 2 105.82 15.3 JS02 3 15.42 34.7 4 205.05 56.5 JS03 5 80.01 24.8 6 22.76 18.7 JS04 7 44.95 28.6 8 16.45 47.7 JS05 9 64.00 19.1 10 22.28 16.1 JS06 11 84.12 48.6 12 68.41 34.5 JS07 13 129.41 36.7 14 77.56 40.9
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