深海能源土含气储层边坡稳定性研究  

Study on slope stability of deep-sea energy soil gas reservoir

作　　者：王滢 王妍妍 高盟[1,2] 张粮 WANG Ying;WANG Yanyan;GAO Meng;ZHANG Liang(Shandong Provincial 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)

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

出　　处：《山东科技大学学报（自然科学版）》2024年第1期32-40,共9页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金青年基金项目(51808324)。

摘　　要：深海能源土开采不当往往会造成含水合物储层的强度劣化,诱发海床失稳问题。为探究深海能源土开采对含气储层边坡稳定性的影响,以深海能源土采挖回填装置的开采工况为实际工程背景,针对3种工况下能源土采挖回填诱发的海底滑坡现象,基于有限元强度折减法建立数值模型,分析不同黏土含量、含气量及回填加固等因素引起的水合物含气储层稳定性问题,得到相应安全系数。研究结果表明:黏土含量越高,海底沉积物边坡的安全系数越低,边坡稳定性越差;含气量对深海能源土含气储层的边坡稳定性呈非线性影响,安全系数随含气量的增加呈先上升后下降的趋势;采用胶结性材料进行回填加固处理可提高海底边坡安全系数,边坡稳定性增强。Improper exploitation of deep-sea energy soil often leads to the deterioration of the strength of hydrate-bearing reservoirs and the instability of the seabed.In order to explore the impact of deep-sea energy soil mining on the slope stability of gas-bearing reservoir,this study took the mining conditions of deep-sea energy soil mining and backfilling devices as the actual engineering background to address the submarine landslide phenomena induced by energy soil mining and backfilling under three working conditions.Based on the finite element strength reduction method,a numerical model was first established.Then,the stability of hydrate gas-bearing reservoir caused by such factors as different clay contents,gas contents and backfill reinforcement was analyzed.Finally,the corresponding safety factor was obtained.The results show that the higher the clay content is,the lower the safety factor of the seabed sediment slope and the worse the slope stability become.The gas content has a nonlinear effect on the slope stability of the deep-sea energy soil gas reservoir,and the safety factor increases first and then decreases with the increase of the gas content.After backfilling and strengthening with cementitious materials,the safety factor of the submarine slope is improved and the slope stability is enhanced.

关 键 词：深海能源土 含气储层 强度折减法 边坡稳定性 安全系数 

分 类 号：TU411[建筑科学—岩土工程] P744.4[建筑科学—土工工程]