摘要
评价和预测穿过采空区的油气管道变形是油气储运工程制定管道安全预防对策的主要依据之一。结合工程实例,将现场变形监测与基于FLAC 3D的数值模拟结果相比较,采用针对采空区和管道变形特点的三维数值模型、适合采空区岩土和管道性质的本构模型计算单元和计算参数。结果表明,模拟结果与实际监测数据较吻合,管道沉降最大误差小于3.98%,管道上方地表下沉最大值误差小于7.52%。
Abstract： The paper is to provide the numerical simulation results of the oil and gas pipeline deformation in the mining out areas. As is known, more and more oil and gas pipelines have to pass through the mining subsidence area. That makes it necessary to properly evaluate and predict the liability of the oil and gas pipeline deformation in such areas. However, the previous studies used to resort to two main methods in this way, that is, the analytical method and numerical simulation. The application of the latter indicated that it can solve the complicated engineering problems effectively and reliably. However, we have chosen the Fast Lagrangian Finite Difference Program （FLAC 3D） in this paper to study the oil and gas pipeline deformation prob lem in the miningover areas and collect necessary field monitoring data for evaluating the reliability of the simulated results. And, for this need, we have developed a numerical model based on the simpli fied layers in accordance with the range of coal mining subsidence. On account of the characteristic features of the deformation situation of the gob and oil and gas pipeline, we have chosen different constitutive models, calculation units and parameter features separately. Since the pipelines consist of transversely isotropic elastic shell ele ments, the rock and soil mass tend to follow the M C failure criteria in the numerical simulation model, which makes it necessary to moni tor the deformation situation of the individual surface sections and pipelines respectively by setting up the corresponding monitoring points. The monitoring facts show that the simulated monitoring re suits are in nice agreement with the field monitoring data. What＇ s more, the observed data prove that the maximal settlement value of ground surface tends to be 2.95 m whereas that of the pipeline is 1.81 m, with the maximal pipeline tensile stress being over the toler able tensile strength of the pipeline material. In addition, the oil and gas pipeline settlement maximum error proves t
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第4期87-91,共5页
Journal of Safety and Environment
关键词
安全工程
采空区
管道变形
数值模拟
现场监测
safety engineering
mined-out area
pipeline deformation
numerical simulation
in-situ monitoring
