Centrifugal experiment on stratum instability and failure process due to gas hydrate dissociation
Centrifugal experiment on stratum instability and failure process due to gas hydrate dissociation
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DOI：
10.1201/b15794-33
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Xb B. Lu;Xh Zhang;Hu Gh
中科院分区：
文献类型：
--
作者：
Xb B. Lu;Xh Zhang;Hu Gh
通过离心实验研究天然气水合物解离引起的地层失稳。采用生物厌氧发酵法合成了第一个含天然气水合物样品。以粉砂为骨架。然后进行了四次离心实验来研究地层对天然气水合物解离的响应。观测地层滑动特征、孔隙压力变化及位移。结果表明，天然气水合物解离过程中和解离后，产生的气体会导致孔隙压力增加和斜坡向趾部滑动。破坏首先发生在样品的趾部，并沿弧形滑动面向下滑动。斜坡顶部出现裂缝。倾斜角度变得越来越小。该工作有利于进一步研究天然气水合物解离引起的地层失稳条件。
Centrifugal experiments were carried out to investigate the stratum instability caused by the dissociation of gas hydrate. First gas hydrate-bearing sample was synthesized using biological anaerobic fermentation method. The silty sand was taken as the skeleton. Then four centrifugal experiments were carried out to study the responses of stratum to the dissociation of the gas hydrate. The characteristics of stratum slide and pore pressure variation and displacement were observed. It is shown that the produced gas can cause the increase of pore pressure and slope slide towards the toe during and after dissociation of gas hydrate. The failure occurs first at the toe of the sample and slides downwards along an arc sliding face. Cracks form at the top of the slope. The slope angle becomes smaller and smaller. This work is beneficial to the further study on the instability conditions of stratum due to the dissociation of gas hydrate.