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| Study on the microstructure and failure characteristics of limestone in dissolution reef under uniaxial compression |
| Received:March 12, 2020 Revised:July 22, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20200312002 |
| KeyWord:random clustering algorithm dissolution of reef limestone elastic deformation structural failure |
| Author | Institution |
| 张牧子 |
自然资源部第一海洋研究所, 青岛 |
| 孙永福 |
自然资源部第一海洋研究所, 青岛 ;国家深海基地管理中心, 青岛 |
| 宋玉鹏 |
自然资源部第一海洋研究所, 青岛 |
| 修宗祥 |
自然资源部第一海洋研究所, 青岛 |
| 赵晓龙 |
自然资源部第一海洋研究所, 青岛 |
| 胡光海 |
自然资源部第一海洋研究所, 青岛 |
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| Abstract: |
| Dissolution of reef limestone has a significant impact on the stability of ocean engineering structures and island reef engineering structures,Cavernous dissolution is a common dissolution method for reef limestone.By constructing a discrete element model of random dissolved holes,the meso-deformation and failure characteristics of cave-type dissolved reef limestone are simulated,and its deformation and failure laws and fracture evolution characteristics are analyzed.The results show that the discrete element model of dissolving reef limestone based on stochastic clustering algorithm can well simulate the pore-type dissolution,and its deformation and failure characteristics have obvious rules;with the increase of the dissolution rate,the uniaxial stress-strain curve of the dissolution reef limestone gradually changes from unimodal to bimodal or multimodal,and the failure characteristics gradually change from brittle to plastic.With the increase of the dissolution rate,the uniaxial compressive strength and elastic modulus of reef limestone gradually increases.The compressive strength decreases exponentially,the elastic modulus decreases linearly,and the Poisson's ratio increases first and then decreases,indicating that the sample mainly undergoes structural damage at a high corrosion rate;as the corrosion rate increases the macro fracture surface of the reef limestone gradually disappears.Due to the interaction of dissolving pores,the cracks originating around the pores begin to sprout and gradually penetrate,eventually leading to the overall macroscopic destruction of the sample.The results of this research can provide a theoretical reference for the in-depth understanding of the deformation and failure characteristics of dissolved limestone in marine engineering and island reef engineering. |
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