| 略论破裂构造的形成机制 |
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| 引用本文： | 孙岩,韩克从.略论破裂构造的形成机制[J].地质科学,1981,0(1):73-77. |
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| 作者姓名： | 孙岩 韩克从 |
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| 作者单位： | 1. 南京大学地质系;2. 江苏第四地质队 |
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| 摘 要： | “破裂”一词比之“断裂”有着更为广泛的涵义,其论述必然牵涉到破裂构造的许多问题。本文试图在前人工作基础上,通过实验观察,着重讨论剪切破裂的形成机制和模式。 岩石破裂是由于本身存在着弹性应变能的缘故。本世纪六十年代初,罗贝尔思(J.C. Roberts)等人,已将其原理应用到节理裂隙力学机制的分析上。
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| 关 键 词： | , |
| 收稿时间： | 1980-04-25 |
| 修稿时间： | 1980-04-25; |
ON THE MECHANISM OF THE FORMATION OF FRACTURE STRUCTURES |
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| Sun Yan,Han Kecong.ON THE MECHANISM OF THE FORMATION OF FRACTURE STRUCTURES[J].Chinese Journal of Geology,1981,0(1):73-77. |
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| Authors: | Sun Yan Han Kecong |
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| Institution: | 1. Department of Geology, Nanjing University, Nanjing;2. Fourth Geological Team of Kiangsu |
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| Abstract: | According to Griffith’s theory of rupture and Lajtai’s comments,we have conducted both field investigation of fracture structures,and laboratory studies of photo-elastisity,so that the formation mechanism and evolution history of fracture structures may be elucidated.In an all-round view,their development has undergone three stages:First,the en-echelon fissures appeared in the rockblock,massif or rock sample body.The fissures arranged alternatively and successively with the tail of a fissure opposing the head of the next one.These fissures may be formed by either pure or simple shear.Generally speaking,they were the earliest product in a single tectonic system (i.e.a single tectonic field),or acted as different structural fissures pre-existing in the geological bodies.Under the tectonic stress,they consist in a critical state.Second,the tips of these en-echelon fissures began at first to form tensile cracks nearly parallel to the orientation of principal compression stress,and then their ends link up gradually with each other.Third,the ends of the tensile cracks are completely jointed,and their direction coincides with collinear line of pre-existing echlort fissures.Finally,they develop into a shearing zone,and the mechanical nature of structural plane is either shear-com-pressive or tenso-shearing. |
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