工程地质学报2016，Vol.24Issue(4)：535-541,7.DOI:10.13544/j.cnki.jeg.2016.04.007
荔湾3－1气田管线路由海底峡谷段斜坡稳定性分析
SLOPE STABILITY ANALYSIS OF SUBMARINE CANYON AREA ALONG PIPELINE ROUTE OF LIWAN3-1 GASFIELD
摘要
Abstract
The finite element strength reduction method and limit equilibrium method are used respectively for the slope stabilities of six typical profiles in the submarine canyon area where the submarine pipeline of Liwan3-1 gasfield is laid along its seabed.The soil strength characteristic of increase in depth is considered in the slope stabilities models.The comparison result shows that finite element strength reduction method and limit equilibrium method present consistent results.The stability factors obtained by the finite element strength reduction method are most closed to those of the Spencer method,with a relative error of less than 3. 5%.All the slopes are basically stable,although some local areas in the middle and lower parts of the canyon with low soil strength and high slope are close to the critical state.The slopes in the upper canyon area have relatively higher stability factors than those in the other areas.The horizontal seismic acceleration can reduce the slope stability factor greatly,and the sliding depth usually increases with the acceleration.When the horizontal acceleration is 0. 2g,most slopes in the middle and lower parts of the canyon would fail.The submarine slope angle and the soil strength are the mainly factors which control the slope stability in the canyon area.The stability factor and sliding depth are sensitive to the local slope angle and the strength distribution of the soil.A reasonable slope stability assessment result is dependent on the accuracy of terrain data and soil mechanics parameters.关键词
荔湾3-1 气田/海底峡谷/海底滑坡/稳定性Key words
Liwan3-1 gas filed/Submarine canyon/Submarine landslide/Stability分类
天文与地球科学引用本文复制引用
修宗祥,刘乐军,李西双,解秋红,李家钢,胡光海..荔湾3－1气田管线路由海底峡谷段斜坡稳定性分析[J].工程地质学报,2016,24(4):535-541,7.基金项目
国家自然科学基金青年基金项目(41206058),国家科技重大专项子课题(2011 ZX05056-001－02),国家重点实验室开放基金(LP1514)中央级公益性科研院所基本科研业务费专项资金项目(GY0213G25)资助． （41206058）
