| 深部复合地层组合模式及力学特性室内试验研究 |
| |
| 引用本文： | 尚彦军,蒋毅,魏思宇.深部复合地层组合模式及力学特性室内试验研究[J].新疆地质,2021(1):140-145. |
| |
| 作者姓名： | 尚彦军 蒋毅 魏思宇 |
| |
| 作者单位： | 中国科学院地质与地球物理研究所;中国科学院大学;新疆地质灾害防治重点实验室（新疆工程学院）;中冶建筑研究总院（深圳）有限公司;中国地质调查局油气资源调查中心 |
| |
| 基金项目： | 国家重点基础研究发展计划(973)(2014CB046901);国家自然科学基金面上项目(41772320);新疆地质灾害防治重点实验室、自治区教育厅重点专业建设项目联合资助。 |
| |
| 摘 要： | 深部软硬岩交互出现的复合地层,其复杂多变的结构力学特性对地下工程安全施工构成挑战。本文从复合地层定义和分类出发,建立其结构力学模型。在实验室内采用水泥和纯白高岭土为原料,人工浇筑软、硬叠置型复合地层模型样品,开展单轴及三轴压缩力学试验。结果发现,单轴压缩时复合地层发生脆性张破坏,强度介于软岩强度与硬岩之间。当软硬层厚度比为1∶1时,随围压升高,复合地层弹性模量与泊松比降低,软岩中不规则裂纹增多;当围压达到15 MPa时出现应变硬化;随围压继续升高,软、硬岩径向非协调变形导致应变硬化消失。
|
| 关 键 词： | 复合地层 力学试验 围压 非协调变形 |
Laboratory Experimental Study on Structural Combination Model and Mechanical Properties of Mixed Ground in Large Depth |
| |
| Shang Yanjun,Jiang Yi,Wei Siyu.Laboratory Experimental Study on Structural Combination Model and Mechanical Properties of Mixed Ground in Large Depth[J].Xinjiang Geology,2021(1):140-145. |
| |
| Authors: | Shang Yanjun Jiang Yi Wei Siyu |
| |
| Institution: | (Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing,100039,China;Xinjiang Key Laboratory of Geohazard Prevention(Xinjiang Institute of Engineering),Urumqi,Xinjiang,830023,China;Central Research Institute of Building and Construction(Shenzhen)Co.,Ltd.,MCC Group,Shenzhen,Guangdong,518055,China;Oil and Gas Survey,China Geological Survey,Beijing,100083,China) |
| |
| Abstract: | The structural and mechanical properties of the mixed ground(MG)with the interaction of soft and hard rock in large depth pose a challenge to the safe construction of underground engineering.Starting from the definition and classification of the MG,a structural mechanics model is established.Uniaxial and triaxial compression tests were carried out in the laboratory using cement and pure white kaolin as raw materials and artificial pouring of soft and hard MG model samples.The results show that brittle tensile failure occurs in MG under uniaxial compression,and the strength is between that of soft rock and that of hard rock.When the thickness ratio of soft layer to hard layer is 1:1,the elastic modulus and Poisson's ratio of MG decrease with the increase of confining pressure,and the number of irregular cracks in soft rock increases;when the confining pressure reaches 15MPa,strain hardening occurs.With the increase of confining pressure,the radial incompatible deformation of soft and hard rock leads to the disappearance of strain hardening. |
| |
| Keywords: | Mixed ground Mechanical test Confining pressure Incompatible deformation |
| 本文献已被 维普 等数据库收录！ |
|
