【摘要】：鹽巖是一種比較特殊的軟巖,與普通巖石相比,有更加特別的性質(zhì):結(jié)構(gòu)致密、塑性變形能力強(qiáng),滲透率極低、良好的蠕變行為和損傷自愈等特性,被國(guó)際上公認(rèn)為是石油、天然氣儲(chǔ)備和放射性廢物處置的理想場(chǎng)所。鹽巖儲(chǔ)氣庫(kù)的密封性能是儲(chǔ)氣庫(kù)的一項(xiàng)重要技術(shù)和安全指標(biāo),由于流變損傷的作用,層狀鹽巖儲(chǔ)氣庫(kù)極可能會(huì)因?yàn)樽冃魏头�(wěn)定問(wèn)題,造成天然氣的外部滲漏。針對(duì)我國(guó)鹽礦具有多夾層和多雜質(zhì)的特點(diǎn),本文編寫userc_d_h流變損傷恢復(fù)程序,依托ANSYS二次開發(fā)分析研究了流變損傷和損傷恢復(fù)作用對(duì)層狀鹽巖洞室穩(wěn)定性的影響。首先,通過(guò)已知的鹽巖流變損傷試驗(yàn),研究鹽巖的流變損傷特性,鹽巖變形從局部破壞到總體失穩(wěn),其實(shí)質(zhì)是鹽巖損傷不斷發(fā)展積累的過(guò)程;而鹽巖損傷恢復(fù)過(guò)程,則對(duì)應(yīng)其蠕變速率不斷降低的過(guò)程。其次,基于王貴君教授的流變損傷模型userc_d,編寫開發(fā)了流變損傷恢復(fù)模型userc_d_h。程序使用FORTRAN語(yǔ)言,融合有限元軟件ANSYS的二次開發(fā)技術(shù),具有操作簡(jiǎn)單、可靠性高的特點(diǎn)。再次,應(yīng)用自主開發(fā)的userc_d_h模型,對(duì)具有試驗(yàn)結(jié)果的麥金托什鹽丘鹽巖蠕變?cè)囼?yàn)進(jìn)行驗(yàn)證。加載程序模擬實(shí)際的試驗(yàn)加載過(guò)程即三軸加載,圓柱試件的數(shù)值模型運(yùn)算結(jié)果與試驗(yàn)結(jié)果吻合很好,驗(yàn)證了程序的可用性。最后,將開發(fā)的userc_d_h應(yīng)用于使用ANSYS軟件建立的鹽巖儲(chǔ)庫(kù)幾何模型中。采用userc_d與userc_d_h兩種本構(gòu)模型對(duì)比分析鹽巖洞室在變形、應(yīng)力分布區(qū)域及損傷、蠕變分布區(qū)域的差異,得出應(yīng)用userc_d_h的洞室模型在卸壓時(shí)出現(xiàn)了鹽巖蠕變曲線斜率明顯降低的現(xiàn)象,不同卸壓斜率降低程度不同。采用userc_d_h模型更準(zhǔn)確的描述了鹽巖變形的規(guī)律,這對(duì)維護(hù)洞室的穩(wěn)定,防止災(zāi)變的發(fā)生大有裨益。創(chuàng)新點(diǎn):對(duì)鹽巖洞室的變形和穩(wěn)定性分析加入了損傷恢復(fù)作用,借助ANSYS軟件的二次開發(fā)功能模擬了洞室的損傷以及對(duì)洞室進(jìn)行卸壓時(shí)鹽巖的損傷恢復(fù)現(xiàn)象。
[Abstract]:Salt rock is a kind of special soft rock. Compared with ordinary rock, salt rock has more special properties, such as dense structure, strong plastic deformation ability, extremely low permeability, good creep behavior and self-healing of damage, etc., which is recognized as oil in the world. Ideal place for gas storage and radioactive waste disposal. Sealing performance of salt rock gas storage is an important technical and safety index of gas storage. Due to the effect of rheological damage, stratified salt gas storage is likely to cause external leakage of natural gas due to deformation and stability. In view of the characteristics of multi-intercalation and multi-impurity in salt mines in China, the userc_d_h rheological damage recovery program is compiled, and the influence of rheological damage and damage recovery on the stability of layered salt caverns is studied by means of secondary development of ANSYS. First of all, through the known salt rock rheological damage test, the rheological damage characteristics of salt rock are studied. The salt rock deformation from local failure to total instability is essentially the process of salt rock damage development and accumulation, while the salt rock damage recovery process. It corresponds to the process of decreasing creep rate. Secondly, based on Professor Wang Guijun's rheological damage model userc_d, the rheological damage recovery model userc_d_h. is developed. The program uses FORTRAN language and combines the secondary development technology of finite element software ANSYS. It has the characteristics of simple operation and high reliability. Thirdly, the creep test of salt rock in Macintosh salt mound with experimental results is verified by using userc_d_h model developed by ourselves. The loading program simulates the actual experimental loading process, that is, triaxial loading. The numerical model results of the cylindrical specimen are in good agreement with the experimental results, and the availability of the program is verified. Finally, the developed userc_d_h is applied to the geometric model of salt reservoir established by ANSYS software. The difference of deformation, stress distribution, damage and creep distribution of salt rock cavern is analyzed by using userc_d and userc_d_h constitutive models. It is concluded that the slope of creep curve of salt rock decreases obviously when userc_d_h model is used to relieve pressure. The slope of different pressure relief is different. The userc_d_h model is used to describe the law of salt rock deformation more accurately, which is helpful to maintain the stability of the cavern and prevent the occurrence of catastrophe. Innovation: damage recovery effect is added to the deformation and stability analysis of salt rock cavern. The damage and recovery phenomenon of salt rock is simulated by the secondary development function of ANSYS software.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE972

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 楊占玄;許力飛;;我國(guó)天然氣勘探開發(fā)現(xiàn)狀與前景分析[J];理論月刊;2010年09期

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本文編號(hào)：2244207