本文關(guān)鍵詞： 煤礦開采 埋地管道 有限元 懸空試驗(yàn) 遠(yuǎn)程監(jiān)測(cè)　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：采空沉陷區(qū)有可能造成地表沉降變形、碎裂甚至塌陷等次生地質(zhì)災(zāi)害。當(dāng)管道需要通過(guò)地表移動(dòng)變形區(qū)時(shí),將造成埋地油氣管道的大范圍變形甚至懸空,對(duì)管道的安全極為不利。論文開展油氣管道工程穿越采空區(qū)管道的應(yīng)力變形變化特征分析、失效評(píng)判標(biāo)準(zhǔn)研究及管道遠(yuǎn)程監(jiān)測(cè),有利于防范采空區(qū)災(zāi)害發(fā)生和評(píng)估采空區(qū)不良地質(zhì)對(duì)油氣管線威脅,為采空區(qū)管道的設(shè)計(jì)、建設(shè)和管理維護(hù)提供理論依據(jù)和技術(shù)參考。 首先,研究了受采空沉陷區(qū)地表移動(dòng)影響下埋地管道的變形特征。針對(duì)沉陷區(qū)埋地管道,在管道柔性判據(jù)成立的條件下,以地表下沉和橫移變形表示管道變形曲線,分析了管土間的軸向相互作用關(guān)系。在此基礎(chǔ)上分析采空沉陷區(qū)管道受力的特點(diǎn),結(jié)合概率積分法、大撓度梁理論、彈性地基梁理論、管土作用雙線性等理論,給出了管道物理伸長(zhǎng)和幾何變形間的協(xié)調(diào)方程。通過(guò)對(duì)算例的分析,能夠得出采空沉陷區(qū)管道的受力特點(diǎn)。 其次,對(duì)于采空區(qū)空間位置的變化和不同的開采工況,建立煤礦區(qū)開采過(guò)程油氣管道的有限元仿真計(jì)算模型和采空塌陷懸空管道的仿真計(jì)算模型,對(duì)管道不同工況(管線方向與工作面推進(jìn)方向不同夾角、不同傾斜角度傾斜煤層、不同埋深、不同內(nèi)壓)開采的影響進(jìn)行研究,分析了管道的力學(xué)行為及變形演化規(guī)律。通過(guò)懸空管道試驗(yàn)驗(yàn)證了懸空管道仿真計(jì)算模型的正確性,并對(duì)采空塌陷區(qū)懸空管道力學(xué)狀態(tài)分析,采用基于應(yīng)力和基于應(yīng)變兩種不同理論對(duì)懸空管道進(jìn)行失效分析,確定了懸空管道基于應(yīng)變失效的容許跨度和極限跨度。分析結(jié)果表明：在采空區(qū)鋪設(shè)管道工程中,管線走向應(yīng)盡可能與煤層開采工作面推進(jìn)方向成90°夾角時(shí)為最優(yōu)鋪設(shè)方向；礦區(qū)較平緩的傾斜煤層開采過(guò)程中對(duì)管道的影響比傾斜角度較大時(shí)的傾斜煤層開采時(shí)對(duì)管道的影響大；礦區(qū)管道應(yīng)以淺埋為宜,同時(shí)為了降低管土間的軸向摩擦作用,宜選用低摩擦的回填材料；采空塌陷管道處于懸空狀態(tài)下,從應(yīng)變分析角度對(duì)管道懸空下沉過(guò)程中的力學(xué)行為、管道的安全狀態(tài)分析具有切實(shí)的幫助；失效評(píng)判標(biāo)準(zhǔn)取極限應(yīng)變2%來(lái)判定懸空管道失效是合理的。 最后,針對(duì)新疆蘆草溝煤層采空區(qū)地質(zhì)特征,結(jié)合鄯-烏線管道的潛在危害以及在煤礦采空區(qū)的實(shí)際情況,提出可行的監(jiān)測(cè)方法。數(shù)據(jù)分析表明,此遠(yuǎn)程監(jiān)測(cè)方法能夠準(zhǔn)確監(jiān)測(cè)得到管體在采空區(qū)地表移動(dòng)中應(yīng)力、應(yīng)變的變化特征和變化量,為長(zhǎng)輸管道穿越礦山采空區(qū)的安全維護(hù)提供了經(jīng)濟(jì)可行的解決方案。
[Abstract]:The mining subsidence area may cause surface subsidence and deformation, fragmentation and even collapse of secondary geological disasters. When the pipeline needs through the surface movement and deformation zone, will result in a wide range of buried oil and gas pipeline deformation even vacant, the pipeline is not safe. The development of oil and gas pipeline crossing engineering Mining goaf pipeline stress and deformation change characteristics analysis, research and evaluation criteria of pipeline failure remote monitoring, is conducive to the prevention of goaf disaster occurrence and evaluation of goaf bad geology of oil and gas pipelines is threatened, for the design of goaf mining pipeline, construction and maintenance management to provide theoretical basis and technical reference.
First, study the deformation characteristics of mining subsidence area by surface movement under the influence of underground pipeline. For buried pipeline, the pipeline in the establishment of flexible criterion under the condition of surface subsidence and horizontal deformation in said pipeline deformation curve, analyzed the axial tube soil interaction relationship. Based on the analysis of characteristics of mining subsidence area of pipeline stress, combined with probability integral method, large deflection beam theory, the theory of elastic foundation beam, pipe soil interaction bilinear theory, coordination equation of pipe physical and geometric deformation between the elongation is presented. Through the analysis of example, to conclude that the mining subsidence area of pipeline stress characteristics.
Secondly, the change of goaf spatial location and different mining conditions, the establishment of finite element simulation of coal mine mining process of oil and gas pipeline and the calculation model of mining subsidence simulation of suspended pipeline calculation model of pipeline under different conditions (line direction and face advancing direction with different angle, tilt angle of inclined coal seam, different depth, different internal pressure) of mining influence, analyzes the mechanical behavior and deformation evolution law. Through the suspended pipeline pipeline test verified the correctness of the suspended pipeline simulation model, and analysis of mining subsidence area of suspended pipeline mechanical state, the stress and strain based on two kinds of theories of suspended pipeline based on the failure analysis, determine the allowable limit span of suspended pipeline span and the failure strain. Based on the analysis of the results showed that: in the goaf of laying pipeline, pipe line to be As far as possible with the coal mining face advancing direction 90 degree angle as the optimal laying direction; effect on the impact of coal mining on the slope of pipeline pipeline inclined coal seam mining process in the mining area is relatively flat is larger than the tilt angle of pipe should be buried in shallow mining area; at the same time is appropriate, in order to reduce the pipe axial friction effect soil, backfill material should choose low friction; mining subsidence pipe in a suspended state, from the angle of strain analysis of mechanical behavior of suspended pipeline in the sinking process, analysis of the safety state of pipeline with practical help; failure criterion of limit strain 2% to determine the suspended pipeline failure is reasonable.
Finally, according to the Xinjiang Lucaogou coal mined out area geological features, combined with the potential hazards of Shan Wu line pipe and the actual situation of goaf in coal mine, the monitoring method is feasible. The data analysis shows that this method can get the accurate monitoring of remote monitoring pipe in the goaf surface stress move, change the characteristics and changes of the amount of strain, provide economic and feasible solution for safety maintenance through the goaf of long distance pipeline.

【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE973

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