含水合物沉积物三轴剪切试验与损伤统计分析
TRIAXIAL SHEAR TESTS AND STATISTICAL ANALYSES OF DAMAGE FOR METHANE HYDRATE-BEARING SEDIMENTS
查看参考文献38篇
文摘
|
天然气水合物开采诱发水合物分解,削弱水合物地层强度,可能导致地层滑动和生产平台倒塌等工程地质灾害,对水合物开采安全性构成严重威胁. 深入理解含水合物沉积物力学性质并建立合理的本构关系模型是水合物开采安全性评价的前提条件. 在自主研发的含水合物沉积物力学性质测试实验装置上,采用饱和水海砂沉积物气体扩散法制备了含水合物沉积物样品,并开展了系列的排水三轴剪切试验,通过时域反射技术实现了样品中水合物饱和度的实时在线测量;基于复合材料的罗伊斯(Reuss)应力串联模型和沃伊特(Voigt)应变并联模型提出了含水合物沉积物等效弹性模量的细观力学混合律模型,结合损伤统计理论和摩尔--库伦破坏准则改进了含水合物沉积物的本构关系模型. 结果表明:随着水合物饱和度的增加和有效围压的减小,应力--应变曲线由应变硬化型变为应变软化型,割线模量和峰值强度均随水合物饱和度与有效围压的增加而提高,黏聚力受水合物饱和度影响明显,而内摩擦角基本不变;提出的等效弹性模量细观力学混合律模型与改进的本构关系模型均具有良好的适用性,模型参数少且物理意义明确. |
其他语种文摘
|
Any perturbation to the thermodynamic equilibrium by exploitation may push out hydrate-bearing sediments (HBS) out of the stability zone, thus inducing hydrate dissociation, loss of cementation, which, in turn, can cause submarine landslides and loss of platform foundations during gas extraction operations. Therefore, a thorough understanding of mechanical properties of HBS is of great importance for stability analyses under different environmental conditions. A series of drained triaxial shear tests were carried out on a self-developed apparatus with the samples prepared by gas diffusion method, in which the time domain reflectometry technique was used in measurement of hydrate saturations in real time. A meso-mechanical and mixed model for the elastic modulus of HBS was proposed based on the classical series and parallel models, including the parameter of statistical force transfer paths between particles in HBS. A constitutive model of HBS was improved by coupling the statistical damage theory and the Mohr-Coulomb failure criterion. It is shown that the stress-strain curve changes from strain-hardening into strain-softening with the increase of hydrate saturation and the decrease of effective confining pressure; the secant modulus and the peak strength of HBS increase when the hydrate saturation and the effective confining pressure increase; the cohesion of HBS increases obviously with the increase of hydrate content, and the internal friction angle changed little with the increase of hydrate amount; the proposed mixed model for elastic modulus and the constitutive model of HBS are both reasonable and feasible. |
来源
|
力学学报
,2016,48(3):720-729 【核心库】
|
DOI
|
10.6052/0459-1879-15-400
|
关键词
|
含水合物沉积物
;
时域反射技术
;
三轴剪切试验
;
混合律模型
;
统计损伤理论
|
地址
|
1.
青岛海洋地质研究所, 国土资源部天然气水合物重点实验室, 青岛, 266071
2.
中国科学院力学研究所, 北京, 100190
|
语种
|
中文 |
文献类型
|
研究性论文 |
ISSN
|
0459-1879 |
学科
|
建筑科学 |
基金
|
国家自然科学基金资助项目
|
文献收藏号
|
CSCD:5713566
|
参考文献 共
38
共2页
|
1.
Bouriak S. Inferred gas hydrates and clay diapers near the Storregga slide on the southern edge of the Voring Plateau, offshore Norway.
Marine Geology,2000,163:125-148
|
被引
26
次
|
|
|
|
2.
Winters W J. Methane gas hydrate effect on sediment acoustic and strength properties.
Journal of Petroleum Science and Engineering,2007,56:127-135
|
被引
65
次
|
|
|
|
3.
石要红. 南海水合物黏土沉积物力学特性试验模拟研究.
力学学报,2015,47(3):521-528
|
被引
30
次
|
|
|
|
4.
Winters W J. Physical properties and rock physics models of sediment containing natural and laboratoryformed methane gas hydrate.
American Mineralogist,2004,89:1221-1227
|
被引
46
次
|
|
|
|
5.
Hyodo M. Basic research on the mechanical behavior of methane hydrate-sediments mixture.
Soils and Foundations,2005,45(1):75-85
|
被引
29
次
|
|
|
|
6.
Masui A. Mechanical properties of natural gas hydrate bearing sediments retrieved from Eastern Nankai Trough.
Proceedings of the Offshore Technology Conference,2008
|
被引
1
次
|
|
|
|
7.
Hyodo M. Mechanical and dissociation properties of methane hydrate-bearing sand in deep seabed.
Soils and Foundations,2013,53(2):299-314
|
被引
50
次
|
|
|
|
8.
张旭辉. 天然气水合物沉积物力学性质的试验研究.
岩土力学,2010,31(10):3069-3074
|
被引
57
次
|
|
|
|
9.
魏厚振. 不同水合物含量含二氧化碳水合物砂三轴试验研究.
岩土力学,2011,32(S2):198-203
|
被引
24
次
|
|
|
|
10.
颜荣涛. 水合物形成对含水合物砂土强度影响.
岩土工程学报,2012,34(7):1234-1240
|
被引
32
次
|
|
|
|
11.
李洋辉. 温度和应变速率对水合物沉积物强度影响试验研究.
天然气勘探与开发,2012,35(1):50-53
|
被引
10
次
|
|
|
|
12.
李洋辉. 围压对含水合物沉积物力学特性的影响.
石油勘探与开发,2011,38(5):637-640
|
被引
20
次
|
|
|
|
13.
业渝光. 天然气水合物超声和时域反射联合探测技术.
海洋地质与第四纪地质,2008,28(5):101-107
|
被引
11
次
|
|
|
|
14.
孙中明. 沉积物中甲烷水合物饱和度测定及其力学特性研究.
实验力学,2013,28(6):747-754
|
被引
13
次
|
|
|
|
15.
Waite W F. Physical properties of hydrate-bearing sediments.
Reviews of Geophysics,2009,47(4):RG4003
|
被引
76
次
|
|
|
|
16.
杨期君. 含气水合物沉积物弹塑性损伤本构模型探讨.
岩土力学,2014,35(4):991-997
|
被引
15
次
|
|
|
|
17.
Sultan N. Geomechanical constitutive modeling of gashydrate-bearing sediments.
Proceedings of the 7th International Conference on Gas Hydrates,2011
|
被引
8
次
|
|
|
|
18.
Miyazaki K. A nonlinear elastic constitutive model for artificial methane-hydrate-bearing sediment.
Proceedings of the 7th International Conference on Gas Hydrates,2011
|
被引
3
次
|
|
|
|
19.
Pinkert S. Prediction of the mechanical response of hydrate-bearing sands.
Journal of Geophysical Research, Solid Earth,2014,119:4695-4707
|
被引
7
次
|
|
|
|
20.
吴二林. 考虑损伤的含天然气水合物沉积物本构模型.
岩石力学与工程学报,2012,31(S1):3045-3050
|
被引
28
次
|
|
|
|
|