| 引用本文: | 李鹏波,王金安.煤层上覆岩层力学性质随赋存深度变化试验[J].哈尔滨工业大学学报,2015,47(12):98.DOI:10.11918/j.issn.0367-6234.2015.12.017 |
| LI Pengbo,WANG Jin’an.Experimental on mechanical properties of overlying strata rock changed with the occurrence depth[J].Journal of Harbin Institute of Technology,2015,47(12):98.DOI:10.11918/j.issn.0367-6234.2015.12.017 |
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| 摘要: |
| 为获得煤层上覆岩层力学性质随赋存深度变化的规律,钻孔选取从地表到煤层的所有完整岩石,通过室内力学试验获取相应力学参数.试验结果表明:试样的天然密度、抗拉强度、单轴抗压强度和弹性模量等随着赋存深度增加而增大,吸水率、泊松比随着赋存深度增加而减小；试样力学性质除了与赋存深度有关外,还与岩性有直接关系；试验数据的离散性随着赋存深度增加而增大.造成试验数据离散性的原因除构造应力、煤层采动及温度影响外,主要是砂岩等沉积岩试样内部颗粒随着应力解除而重新耦合. |
| 关键词: 岩体力学参数 赋存深度 试验研究 离散性 颗粒耦合 |
| DOI：10.11918/j.issn.0367-6234.2015.12.017 |
| 分类号:TU452 |
| 基金项目:国家自然科学基金重点项目(U1361208);煤炭资源开采与环境保护国家重点试验室资助项目(11KF03). |
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| Experimental on mechanical properties of overlying strata rock changed with the occurrence depth |
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LI Pengbo1,2, WANG Jin’an1
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(1.Civil and Environmental Engineering School, University of Science and Technology Beijing, 100083 Beijing, China; 2. State Key Laboratory of Coal Resources and Safe Mining (China University of Mining and Technology),221116 Xuzhou, Jiangsu, China)
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| Abstract: |
| Mechanical parameters were obtained by mechanical test to obtain the mechanical properties of overlying strata in coal seam. Test results show that natural density, tensile strength, uniaxial compressive strength and the elastic modulus of the samples increase with the raise of the occurrence depth while water absorption rate and Poisson's ratio decrease with the increase of the occurrence depth, and the mechanical properties of the specimen are directly related to the lithology. Discreteness of test data increases with the increase of the occurrence depth. In addition to tectonic stress, coal mining and temperature effects, the main reason for discreteness is that the internal particles of the sandstone and other sedimentary rocks recouple with the stress relief. |
| Key words: mechanical parameters the occurrence depth experimental study discreteness particle coupling |
