| 降压开采过程中含水合物沉积物的力学特性研究 |
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| 引用本文： | 吴 起,卢静生,李栋梁,梁德青.降压开采过程中含水合物沉积物的力学特性研究[J].岩土力学,2018,39(12):4508-4516. |
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| 作者姓名： | 吴 起 卢静生 李栋梁 梁德青 |
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| 作者单位： | 1. 中国科学院广州能源研究所, 广东 广州510640；2. 中国科学院 天然气水合物重点实验室，广东 广州 510640；3. 中国科学院 广东省新能源和可再生能源研究开发与应用重点实验室，广东 广州 510640；4. 中国科学院广州天然气水合物中心，广东 广州510640；
5. 中国科学院大学，北京 100049 |
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| 基金项目： | 国家自然科学基金（No. 51474197，No. 51661165011）和国家重点研发计划（No. 2016YFC0304002） |
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| 摘 要： | 天然气水合物是一种潜在的能源资源，开采过程中，水合物的分解会造成工程和地质等安全隐患。为研究降压开采过程中多因素综合影响条件下沉积物的力学性质，在自主研发的低温高压三轴仪上进行了不同围压条件下含水合物沉积物的剪切试验。试验结合常规三轴剪切及一个试样多级加荷的方法，并加入了水合物的降压分解过程。结果表明：水合物的存在可以显著提高沉积物的抗剪强度。在降压分解过程中，含水合物沉积物试样的力学强度受到有效围压和孔隙中水合物含量的综合影响。前期试样由于孔隙压力降低导致有效围压大幅增加，试样抗剪强度增大，后期由于水合物含量的大幅降低，试样在较高有效围压下抗剪强度下降。有效围压对含水合物沉积物试样的体积应变有较大的影响，较高的有效围压会导致含水合物试样产生显著的剪缩现象。
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| 关 键 词： | 含水合物沉积物 降压开采 力学特性 三轴剪切试验 |
| 收稿时间： | 2017-04-25 |
Experimental study of mechanical properties of hydrate-bearing sediments during depressurization mining |
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| WU Qi,LU Jing-sheng,LI Dong-liang,LIANG De-qing.Experimental study of mechanical properties of hydrate-bearing sediments during depressurization mining[J].Rock and Soil Mechanics,2018,39(12):4508-4516. |
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| Authors: | WU Qi LU Jing-sheng LI Dong-liang LIANG De-qing |
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| Abstract: | Natural gas hydrate is anticipated to be a potential energy resource. During the mining process from methane hydrate reservoir, the decomposition of methane hydrate can cause risks threatening the safety of engineering and geology. A series of shear tests under different confining pressure conditions was carried out using self-developed low-temperature and high-pressure triaxial apparatus to investigate the mechanical properties of sediments containing methane hydrate under different conditions. The experiment combined with conventional triaxial shear method and multi-stage loading tests was focused on the hydrate decomposition process. It was found that the strength of the sediments was significantly increased due to the presence of hydrates. In the process of depressurization, the strength of sediments was found to be affected by the variations of effective confining pressure and the hydrate saturation. At the early stage, due to the decrease of pore pressure, the effective confining pressure significantly increased, and the shear strength increased as well. In the later stage, the shear strength of samples decreased under high effective confining pressure due to the decrease of hydrate content. The effective confining pressure had a great effect on volumetric strain of the hydrate sediments, and higher effective confining pressure led to obvious shear shrinkage. |
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| Keywords: | methane hydrate-bearing sediments depressurization mechanical properties triaxial tests |
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