深海能源土含气储层力学特性三轴试验研究  

Triaxial test study on mechanical properties of deep-sea energy-bearing soil gas reservoir

作　　者：孔凡玲 王滢 张粮 高盟[1,2] 吴迪 KONG Fanling;WANG Ying;ZHANG Liang;GAO Meng;WU Di(Shandong Province Key Laboratory of Civil Engineering&Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215129,China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学土木工程与建筑学院,山东青岛266590 [3]苏州科技大学土木工程学院,江苏苏州215129

出　　处：《海洋工程》2023年第6期148-157,共10页The Ocean Engineering

基　　金：国家自然科学基金资助项目(51808324)。

摘　　要：为研究深海能源土在负压开采过程中含气储层的力学特性,基于含气土赋存理论,提出一种能够控制含气量及气泡大小的制样方法,通过GDS标准应力路径三轴试验系统,开展深海能源土含气储层的固结排水试验研究,分析深海能源土在不同黏土含量及不同含气量下的力学响应规律。研究结果表明:围压变化对深海能源土含气储层的抗剪强度峰值大小影响显著,围压越大抗剪强度峰值越高;黏土含量是决定应力应变曲线变化趋势的关键影响因素,黏土含量越高试样抗剪强度越低,试样抵抗应变软化效应的能力越强;含气土比饱和土体承载能力更低,且承载能力随含气量的增大呈衰减趋势;黏土含量和含气量是深海能源土含气储层抗剪强度指标的重要影响因素,黏土含量、含气量越高,土体自身的总抗剪强度值越低。In order to study the mechanical properties of gas bearing reservoir of deep-sea energy soil in the mining process,based on the occurrence theory of gas bearing soil,a sample preparation method that can control the gas content and bubble size is proposed.The consolidation and drainage test of gas bearing reservoir of deep-sea energy soil is carried out through GDS unsaturated soil triaxial test system,and the mechanical response of deep-sea energy soil under different clay contents and different gas contents is analyzed.The results show that the change of confining pressure has a significant effect on the peak shear strength of deep-sea energy soil gas bearing reservoir.The higher the confining pressure is,the higher the peak shear strength is;and clay content is the key factor to determine the change trend of stress-strain curve.The higher the clay content,the lower the shear strength of the sample,and the stronger the ability of the sample to resist strain softening effect;the bearing capacity of aerated soil is lower than that of saturated soil,and decreases with the increase of gas content;and clay content and gas content are important factors affecting the shear strength index of deep-sea energy soil gas bearing reservoir.The higher the clay content and gas content,the lower the total shear strength of the soil itself.

关 键 词：深海能源土 含气土 能源开采 三轴试验 力学特性 

分 类 号：P744[天文地球—海洋科学] TU411[建筑科学—岩土工程]