Mining Surface Movement Deformation Research On Evaluation Of The Effects Of Long-distance Pipeline

The pipeline transport in long distance(hereinafter referred to as long-distance pipeline)is a linear structures,such as the oil-gas long-distance pipeline,and it not only continuously conveys oil and gas with long distance,but also has the special safety requirements.In recent years,the petroleum long-distance pipeline is having much rapid development as a way of oil-gas convey with rapidly and continuously.And it is one of the most important issues that we must solve right now that laying the long-distance pipeline through the mining subsidence area and the virgin zone.This paper that aims at the virgin zone laying the long-distance pipeline,researches the evaluation effect on the pipeline that the surface movement and deformation caused by the mining.On the basic of the analysis of the characteristics of the mining surface subsidence basin and the basic rule of the surface movement and deformation,we will divide the damaged forms of the surface movement and deformation into persistent,non-persistent and stochastic.And we will combine the mechanical character of the oil-gas long-distance pipeline's linear structures and the surface deformation under the influence of the mining.Then on the basic of the existing research findings,we will provide the relative relation of the surface subsidence length and the pipeline in the subsidence areas,and the method that the force analysis when the pipeline can stand the most sink and the most sink length of the pipeline.On the basic of the main element which effects the surface movement and deformation and the mechanical characteristics of the long-distance pipeline,combining the reason which the disaster happens in the subsidence area,we set up the safety evaluation index system which is used in the oil-gas long-distance pipeline in the mining subsidence area,and build the comprehensive fuzzy appraisal model which is used to evaluate the pipeline's safereliability and the safety evaluation index.Then,we combine the pipeline engineering of the Shanxi-Beijing,which is a practical example.And we use the comprehensive fuzzy appraisal model to confirm the safety degree of the pipeline,combining the comparison of results inspection which is caused by the pipeline stress in the subsidence area and the most sink length.