云南某高填方边坡对油气管道的致灾风险及CFG加固效果分析对油气管道的影响  

Analysis of disaster risk to oil and gas pipelines and the effect of CFG reinforcement on high-fill slopes in Yunnan

作　　者：刘章振 阿发友 张晶 杨大慎 刘小波 LIU Zhangzhen;A Fayou;ZHANG Jing;YANG Dashen;LIU Xiaobo(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093,China;Key Laboratory of Geohazard Forecast and Geoecological Restoration in Plateau Mountainous Area,Ministry of Natural Resources of the People’s Republic of China,Kunming,Yunnan 650093,China;Yunnan Key Laboratory of Geological Hazard Forecasting and Early Warning and Ecological Protection and Restoration in Highland Mountainous Areas,Kunming,Yunnan 650093,China;Kunming Oil and Gas Transmission Branch of Southwest South China Branch of National Petroleum and Natural Gas Pipeline Network Group Co.Ltd.,Kunming,Yunnan 650093,China;Southwest China Branch of National Petroleum and Natural Gas Pipeline Network Group Co.Ltd.,Kunming,Yunnan 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]自然资源部高原山地地质灾害预报预警与生态保护修复重点实验室,云南昆明650093 [3]云南省高原山地地质灾害预报预警与生态保护修复重点实验室,云南昆明650093 [4]国家管网集团西南管道有限责任公司昆明输油气分公司,云南昆明650093 [5]国家管网集团西南管道有限公司,云南昆明650093

出　　处：《中国地质灾害与防治学报》2024年第4期115-125,共11页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金地区科学基金项目(4226070179)。

摘　　要：文章旨在研究位于云南省安宁市的某重点建设项目中填方边坡的稳定性及对坡脚油气管道的影响。该项目于2023年初形成了长近1.6 km、最大高度约42 m的高填方边坡,由于场地规划选址的限制,在高填方边坡坡脚平行埋设有4条油气管道,边坡坡脚距离最近的管道仅有7 m,这给油气管道的安全带来了严重威胁。研究采用FLAC3D软件,分析了填方边坡对坡脚管道的影响,并探讨了在边坡坡脚布置5排CFG桩的情况下边坡的稳定性。研究结果表明:失稳滑动面仅出现在人工填土内,位于油气管道上方;填方边坡的基本稳定系数为1.305,在暴雨工况下边坡处于基本稳定状态;管道在天然工况下满足稳定性要求,但在暴雨工况下可能导致变形和破裂;边坡坡脚地基增设5排CFG桩后,暴雨工况下管道变形和椭圆度满足规范要求,边坡稳定系数提升了4.2%,但仍未满足规范安全储备要求。建议进一步采取防治措施以保证填方边坡的安全储备。The study aims to investigate the stability of high fill slopes and their impact on oil and gas pipelines at the foot of the slopes in a key construction project located in Anning City,Yunnan Province.The project formed a high fill slope with a length of nearly 1.6km and a maximum height of about 42 m in early 2023.Due to site planning constraints,four oil and gas pipelines were buried parallel at the foot of the high-fill slope,with the closest pipeline being only 7 m away from the foot of the slope,posing a serious threat to the safety of the oil and gas pipelines.FLAC3D software was employed to analyze the influence of the fill slope on the pipelines at the foot of the slope,and to explore the stability of the slope with the installation of five rows of CFG piles at the toe.The results show that the potential failure surface exists only within the artificial fill,above the oil and gas pipelines.The basic stability factor of the fill slope is 1.305,indicating basic stability under extreme rainfall conditions.Under natural conditions,the pipeline meets the stability requirements,but may lead to deformation and rupture under heavy rainfall conditions.With the addition of five rows of CFG piles at the slope toe,pipeline deformation and ellipticity meet the specification requirements under heavy rainfall conditions,and the safety and stability coefficient of the slope increases by 4.2%,yet fails to meet the specification safety reserve requirements.Further preventive measures are recommended to ensure the safety reserve of the fill slope.

关 键 词：油气管道 高填方边坡 边坡稳定性 CFG桩 边坡安全储备 

分 类 号：P642.22[天文地球—工程地质学]