油气管道敷设方式对含管边坡稳定性影响的研究

发布时间：2018-06-03 14:59

本文选题：油气管道 + 横向敷设　；参考：《兰州理工大学》2017年硕士论文

【摘要】：目前,我国各类输油气管道的总里程累计已突破12万公里,跃居世界前两位。其中,西气东输一、二、三线工程全部贯通,且大部分管道分布在青海、甘肃、陕西等黄土高原地区,该地区地质情况复杂,多高山丘陵,管道在该地区的敷设难免遇到大斜坡及高边坡情况。本次研究从管道地质灾害的现场调研出发,分析了各类含管边坡的坡面水毁以及崩塌、滑坡的危害特征;使用FLAC有限差分软件,在建立了11种管道沿边坡横向敷设的工况和4种管道沿边坡纵向敷设的工况的基础上,分析了各种工况下边坡的剪切应变率、水平位移以及安全系数等指标,研究发现:(1)管道的横向铺设(沿边坡的走向铺设)对边坡安全系数的影响与未铺设管道时边坡滑动面的位置有关,当管道恰好位于滑动面位置时会减小边坡的安全系数,当管道位于滑动面的两侧,即位于滑动区和稳定区时,对边坡的安全系数影响甚微。(2)管道的纵向铺设(沿边坡的坡面铺设)时会在一定程度上提高边坡的安全系数,随着管道与坡面夹角的逐渐增大,边坡的安全系数逐渐减小,但是其均大于原边坡的安全系数。对边坡的稳定性而言,管道的纵向铺设是有利的,但是对管道的受力而言则不利。(3)通过对某矿区内一含管边坡加固工程案例的计算分析,论证了预应力锚索在加固油气管道边坡工程方面的适用性与可靠性,在原始状态下边坡的安全系数为0.94,支护后边坡的安全系数增大至1.28,符合规范的要求,同时在管道周围边坡的水平和竖向位移减小,以及管线周围的应力更加趋于合理,无明显的应力集中现象,即通过支护体系,边坡整体的受力以及位移得到了很大的改善,管道也处于安全运营状态。本次研究立足于油气管道边坡工程的实际需要,重点研究了管道敷设方式对边坡稳定性的影响,同时通过含管边坡加固工程案例,给出加固建议,希望可以为含管边坡防护治理提供有益的帮助。
[Abstract]:At present, the total mileage of various oil and gas pipelines in China has exceeded 120000 km, ranking first two in the world. Among them, the first, second, and third lines of gas transmission from the west to the east are all through, and most of the pipelines are distributed in the Loess Plateau areas such as Qinghai, Gansu, Shaanxi and so on. The geological conditions in this area are complex and there are many high mountains and hills. Large slopes and high slopes are inevitably encountered in the laying of pipelines in this area. Based on the field investigation of geological hazards of pipelines, the characteristics of water damage, collapse and landslide of slope with pipe are analyzed. FLAC finite difference software is used. On the basis of setting up the working conditions of 11 kinds of pipe laying along the side slope and 4 kinds of pipeline laying along the slope longitudinally, the shear strain rate, horizontal displacement and safety factor of the slope under various working conditions are analyzed. It is found that the influence of the transverse laying of the pipeline (along the slope direction) on the slope safety factor is related to the position of the slip surface of the slope when the pipeline is not laid, and the safety factor of the slope will be reduced when the pipeline is just located on the sliding surface. When the pipeline is located on both sides of the sliding surface, that is, in the sliding area and the stable area, the safety factor of the slope will be improved to a certain extent when the longitudinal laying of the pipeline (along the slope surface of the slope) has little effect on the safety factor of the slope. With the increase of the angle between pipeline and slope, the safety factor of slope decreases gradually, but it is larger than that of the original slope. For the stability of the slope, the longitudinal laying of the pipeline is advantageous, but the stress of the pipeline is unfavorable. The applicability and reliability of prestressed anchor cable in reinforcing oil and gas pipeline slope engineering are demonstrated. In the original condition, the slope safety factor is 0.94, and the slope safety factor increases to 1.28 after supporting, which meets the requirements of the code. At the same time, the horizontal and vertical displacement of the slope around the pipeline decreases, and the stress around the pipeline tends to be more reasonable. There is no obvious stress concentration phenomenon, that is, through the support system, the stress and displacement of the slope as a whole have been greatly improved. The pipeline is also in safe operation. Based on the actual needs of oil and gas pipeline slope engineering, this study focuses on the influence of pipeline laying mode on slope stability. At the same time, through the case of pipeline slope reinforcement project, the reinforcement suggestions are given. It is hoped that it can provide beneficial help for the protection and treatment of the slope containing pipe.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE973;TU43

【参考文献】