本文選題：滲透率 + 圍壓��； 參考：《河北聯(lián)合大學》2014年碩士論文

【摘要】：火災事故不僅危害職工安全也浪費大量優(yōu)質(zhì)煤炭資源，給國家?guī)砹穗y以估計的損失，研究如何準確的預測預報煤礦火災也成為礦井安全的重點。煤層中產(chǎn)生的CO來自于煤層中自然發(fā)火或其它火災，還有一部分來源于煤層伴生，現(xiàn)階段對于煤層賦存CO的研究剛剛開始。CO的出現(xiàn)與運移和煤儲層滲透性有直接或間接的關系。煤層滲透性受到煤的變質(zhì)程度、煤巖孔隙結(jié)構(gòu)、外界圍壓、溫度變化和氣體壓力等方面影響。 實驗研究發(fā)現(xiàn)： 隨煤變質(zhì)程度的增加固定碳和灰分而升高，揮發(fā)分含量隨煤變質(zhì)程度的升高而降低。分形維數(shù)D1隨著煤級的升高而出現(xiàn)遞減的趨勢，可以驗證煤中大、中孔隙因煤級的升高而減小。 當外界溫度和氣體壓力保持恒定時，隨著圍壓的增加CO氣體通過煤層的滲透率逐減變小；并存在一個臨界點，過了這一點又有增加的趨勢。主要是由于隨圍壓變大而有效應力隨之變大，使得煤樣內(nèi)孔隙裂隙先被壓縮變小之后趨于穩(wěn)定，最后滲透率趨于穩(wěn)定。 當外界壓力和氣體壓力保持恒定時，環(huán)境溫度的升高導致煤層滲透率的相對減小。因為外界有壓力的作用，使得高溫產(chǎn)生的膨脹作用不能向外延伸，轉(zhuǎn)而向內(nèi)作用，擠壓孔隙，致使流體通道變窄，，流速降低，滲透率變小。 當外界壓力和溫度都保持恒定時，在氣體壓力P小于1.5MPa時，隨著孔隙氣體壓力的增加煤層滲透率越來越�。划斆后w通過有動力源的氣體時，在高氣壓下滲透率又隨著氣壓的升高而升高。
[Abstract]:Fire accident not only endangers the safety of workers but also wastes a large number of high-quality coal resources, which brings the country a loss that is difficult to estimate. The research on how to accurately predict and forecast the coal mine fire has also become the key point of mine safety. The CO produced in coal seam comes from spontaneous combustion or other fire in coal seam, and some comes from coal seam associated with CO. At present, the occurrence of CO in coal seam has a direct or indirect relationship with migration and permeability of coal reservoir. Coal seam permeability is affected by coal metamorphism, coal pore structure, external confining pressure, temperature change and gas pressure. The experimental study found that: With the increase of coal metamorphism, the fixed carbon and ash content increased, and the volatile matter content decreased with the increase of coal metamorphic degree. The fractal dimension D1 decreases with the increase of coal rank. It can be proved that the coal is large and the porosity decreases with the increase of coal grade. When the external temperature and gas pressure remain constant, the permeability of CO gas through coal seams decreases gradually with the increase of confining pressure, and there is a critical point, over which there is an increasing trend. The main reason is that the effective stress increases with the increase of confining pressure, which makes the pore fissure in the coal sample become smaller first and then stabilize, and finally the permeability becomes stable. When the external pressure and gas pressure remain constant, the increase of ambient temperature leads to the relative decrease of coal seam permeability. Because of the external pressure, the expansion produced by high temperature can not extend outward, but inwards, squeezing the pores, causing the fluid channel to narrow, the velocity of flow to decrease, and the permeability to become smaller. When the external pressure and temperature remain constant, when the gas pressure P is less than 1.5MPa, with the increase of pore gas pressure, the permeability of coal seam becomes smaller and smaller, and when the coal body passes through the gas with power source, At high pressure, the permeability increases with the increase of pressure.
【學位授予單位】：河北聯(lián)合大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TD75

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