宋本健, 程远方, 李庆超, 韩忠英, 吕亚慧. 水合物分解对海底边坡稳定影响的数值模拟分析[J]. 海洋地质与第四纪地质, 2019, 39(3): 182-192. DOI: 10.16562/j.cnki.0256-1492.2018031602
引用本文: 宋本健, 程远方, 李庆超, 韩忠英, 吕亚慧. 水合物分解对海底边坡稳定影响的数值模拟分析[J]. 海洋地质与第四纪地质, 2019, 39(3): 182-192. DOI: 10.16562/j.cnki.0256-1492.2018031602
SONG Benjian, CHENG Yuanfang, LI Qingchao, HAN Zhongying, LV Yahui. Simulation of submarine slope stability related to hydrate dissociation[J]. Marine Geology & Quaternary Geology, 2019, 39(3): 182-192. DOI: 10.16562/j.cnki.0256-1492.2018031602
Citation: SONG Benjian, CHENG Yuanfang, LI Qingchao, HAN Zhongying, LV Yahui. Simulation of submarine slope stability related to hydrate dissociation[J]. Marine Geology & Quaternary Geology, 2019, 39(3): 182-192. DOI: 10.16562/j.cnki.0256-1492.2018031602

水合物分解对海底边坡稳定影响的数值模拟分析

Simulation of submarine slope stability related to hydrate dissociation

  • 摘要: 海底边坡失稳会给人类造成巨大危害,部分海底边坡失稳案例被证实与水合物分解有关。由于海底条件的复杂性,人们很难直接观察水合物分解引起的海底边坡失稳过程。数值模拟可以相对准确地预测水合物分解可能引起的海底边坡失稳状况。通过选用基于ABAQUS软件的有限元强度折减法,模拟海底边坡失稳的过程并得到相应结果,分析了水合物分解程度、水合物带上覆厚度、边坡角度等因素对海底边坡稳定性的影响。结果表明,正常情况下,塑性区首先在坡脚区域出现并逐渐向上发展至坡顶;当水合物分解达到一定程度后,塑性区首先出现在水合物带,随后自水合物带向上发展至坡顶,并和随后在坡脚出现的塑性区形成贯通边坡的塑性带。水合物埋藏越深,越有可能造成大规模的滑坡;边坡角度高于15°时,水合物分解会急剧促进边坡失稳。

     

    Abstract: Hydrate dissociation is a significant factor causing submarine slope slide, which is dangerous to human operation. Due to the complex condition of seabed, it is hard to observe the process of slope slide directly. Numerical simulation is an effective approach to acquire some important parameters such as the slide area, slide scale, sliding distance and safety factors etc. Choosing shear strength reduction technique of the finite element based on the software of ABAQUS, we could not only simulate both the process and result of a slope slide, but also evaluate the influence of hydrate dissociation. By changing the parameters of modeling, the characteristics of seafloor can be considered. Of course, the inducing factor is the interaction between the structure of slope and hydrate dissociation. It can guide the hydrate exploitation process and avoid some possible problems by integration of the theoretical and simulation results.

     

/

返回文章
返回