| 某隧道高地应力近水平岩层白云岩三轴试验研究 |
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| 引用本文： | 唐勇,张睿,王孝国,唐浩,姚志刚,蒲松.某隧道高地应力近水平岩层白云岩三轴试验研究[J].路基工程,2022,0(3):118-121. |
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| 作者姓名： | 唐勇 张睿 王孝国 唐浩 姚志刚 蒲松 |
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| 作者单位： | 1.四川蜀道铁路投资集团有限责任公司，成都 610000 |
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| 基金项目： | 四川省科技计划项目（2021YJ0041）；交通运输部交通运输行业重点科技项目清单项目（2020-MS5-146） |
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| 摘 要： | 依托某高地应力近水平岩层硬脆围岩隧道，通过现场钻孔取芯进行岩芯三轴压缩试验。研究表明:白云岩在低围压下发生张拉劈裂和剪切破坏，在高围压下主要发生剪切破坏。通过三轴试验，得到高（30、35 MPa）低（10、15 MPa）不同围压下白云岩的应力-应变关系，通过绘制应力莫尔圆获得白云岩的强度参数:弹模E=31.91 GPa，黏聚力c=22 MPa，内摩擦角φ=47°，并得到白云岩的强度表达式，可为原岩应力的获取提供依据。
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| 关 键 词： | 公路隧道 硬脆岩石 三轴试验 破坏特征 应力莫尔圆 |
| 收稿时间： | 2022-03-28 |
Study on Triaxial Test of Dolomite in Approximate Horizontal Rock Strata with High Ground Stress of a Tunnel |
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| Abstract: | Rock mechanical parameters should be tested by drilling and coring before obtaining the accurate in-situ stress. The triaxial compression test of rock core has been carried out by in-situ drilling for a hard brittle rock tunnel with high ground stress and near horizontal strata. The results show that tensile fracture and shear failure of dolomite occur under low confining pressure, and shear failure mainly occurs under high confining pressure. The stress-strain relationship of dolomite under different confining pressures from high (30, 35 MPa) to low (10, 15 MPa) pressure is obtained by triaxial test. The strength parameters of dolomite have been obtained by drawing stress Moire circle. The elastic modulus is E=31.91 GPa, cohesion c=22 MPa MPa and internal friction Angle is φ=47°, which formed the strength expression of dolomite and can provide a basis for obtaining the stress of primary rock. |
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