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Influences of hydrate layered distribution patterns on triaxial shearing characteristics of hydrate-bearing sediments
Engineering Geology ( IF 6.9 ) Pub Date : 2021-09-11 , DOI: 10.1016/j.enggeo.2021.106375
Yanlong Li , Lin Dong , Nengyou Wu , Alireza Nouri , Hualin Liao , Qiang Chen , Jianye Sun , Changling Liu

Hydrate distribution patterns have significant influences on the mechanical parameters and failure mechanism of the hydrate-bearing sediments (HBS), which remains further investigation at the current state. In this paper, we carried out a series of tests to analyze the mechanical properties of HBS when hydrate is distributed horizontally in laminary mode. The HBS specimens are made of two different hydrate-saturated layers, which are the lower hydrate-saturated sub-layer and the higher hydrate-saturated sub-layer. The experimental results indicate that, whether the sediment shows strain-softening or strain-hardening behavior during shearing is mainly determined by the low hydrate-saturated sub-layer. The cohesion of the HBS is closer to the low hydrate-saturated sub-layer, while the internal friction angle is more approaching to the high hydrate-saturated sub-layer. Under the condition of the same average hydrate saturation, the strength parameters of the HBS with layered hydrate distribution are affected by the height ratio, which is defined as the height ratio of the low hydrate-saturated sub-layer and the high hydrate-saturated sub-layer. The peak strength increases linearly, while the Young's modulus increases logarithmically, with the increase in height ratio. Furthermore, the existence of a low hydrate-saturated layer would reduce the peak strength of the whole HBS. This study provides a theoretical reference for the controlling mechanisms of strength weakening during natural gas hydrate development.



中文翻译:

水合物层状分布模式对含水合物沉积物三轴剪切特性的影响

水合物分布模式对含水合物沉积物(HBS)的力学参数和破坏机制有显着影响,目前仍需进一步研究。在本文中,我们进行了一系列试验来分析当水合物以层状模式水平分布时 HBS 的力学性能。HBS 样品由两个不同的水合物饱和层组成,它们是水合物饱和度较低的子层和水合物饱和度较高的子层。实验结果表明,沉积物在剪切过程中是否表现出应变软化或应变硬化行为,主要取决于低水合物饱和亚层。HBS 的内聚力更接近于低水合物饱和亚层,而内摩擦角更接近于高水合物饱和亚层。在平均水合物饱和度相同的条件下,层状水合物分布的HBS强度参数受高度比的影响,高度比定义为低水合物饱和次层和高水合物饱和次层的高度比。 -层。随着高度比的增加,峰值强度呈线性增加,而杨氏模量呈对数增加。此外,低水合物饱和层的存在会降低整个 HBS 的峰值强度。该研究为天然气水合物开发过程中强度减弱的控制机制提供了理论参考。具有层状水合物分布的HBS强度参数受高度比的影响,高度比定义为低水合物饱和亚层和高水合物饱和亚层的高度比。随着高度比的增加,峰值强度呈线性增加,而杨氏模量呈对数增加。此外,低水合物饱和层的存在会降低整个 HBS 的峰值强度。该研究为天然气水合物开发过程中强度减弱的控制机制提供了理论参考。具有层状水合物分布的HBS强度参数受高度比的影响,高度比定义为低水合物饱和亚层和高水合物饱和亚层的高度比。随着高度比的增加,峰值强度呈线性增加,而杨氏模量呈对数增加。此外,低水合物饱和层的存在会降低整个 HBS 的峰值强度。该研究为天然气水合物开发过程中强度减弱的控制机制提供了理论参考。随着高度比的增加,s 模量呈对数增加。此外,低水合物饱和层的存在会降低整个 HBS 的峰值强度。该研究为天然气水合物开发过程中强度减弱的控制机制提供了理论参考。随着高度比的增加,s 模量呈对数增加。此外,低水合物饱和层的存在会降低整个 HBS 的峰值强度。该研究为天然气水合物开发过程中强度减弱的控制机制提供了理论参考。

更新日期:2021-09-24
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