本文關(guān)鍵詞： 孔隙壓力 三軸壓縮實(shí)驗(yàn) 微地震監(jiān)測 計(jì)算流體力學(xué) CE/SE算法　出處：《中國地震局地殼應(yīng)力研究所》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：流體在地震和斷裂活動(dòng)過程中的作用是一個(gè)典型的水文地球物理問題,與地震破裂過程中的慢滑移和應(yīng)變能的加速積累有著密切的關(guān)系。其中孔隙壓的作用問題是關(guān)注的焦點(diǎn),也是地震流體動(dòng)力過程研究的核心問題。本論文選擇四川盆地的下沙溪廟組砂巖地層的巖心,開展巖石壓裂滲流微震實(shí)驗(yàn)和數(shù)值分析,探索地震活動(dòng)過程與流體孔隙壓力演化之間的關(guān)系。主要結(jié)論如下。以巖石壓裂滲流微震實(shí)驗(yàn)為基礎(chǔ),對(duì)砂巖巖心進(jìn)行飽和三軸壓縮實(shí)驗(yàn),研究孔隙壓與流體飽和度對(duì)巖石物性和聲發(fā)射活動(dòng)的影響。實(shí)驗(yàn)結(jié)果表明,隨著圍壓和孔隙壓力的增加,地震波速度增加。地震波振幅對(duì)圍壓變化敏感。地震壓縮波的到時(shí)揭示了流體的運(yùn)移過程�？紫秹毫εc飽和度削弱了巖石的強(qiáng)度,縮短變形破壞所需的時(shí)間�？紫秹禾荻葘�(duì)裂隙的擴(kuò)展影響顯著。應(yīng)用FLAC3D軟件針對(duì)上述三軸壓縮實(shí)驗(yàn)進(jìn)行數(shù)值模擬。推導(dǎo)出顯式有限差分格式與隱式差分格式計(jì)算穩(wěn)定性準(zhǔn)側(cè)。采用巖石壓裂滲流微震實(shí)驗(yàn)的參數(shù),建立完全飽和狀態(tài)下砂巖三軸壓縮的數(shù)值模型,計(jì)算軸向加載過程以及干燥狀態(tài)下砂巖的壓縮破壞過程。采用上下邊界擴(kuò)展方式,克服了上下界面局部形對(duì)計(jì)算結(jié)果的影響。采用縮短加載速率,將數(shù)值迭代時(shí)間轉(zhuǎn)化為物理時(shí)間。數(shù)值計(jì)算的變形結(jié)果與實(shí)驗(yàn)結(jié)果基本一致�？紫秹旱难莼沂玖藥r石由彈性向塑性變形以及屈服的動(dòng)態(tài)變形與破壞過程�？紫秹禾荻葘�(duì)剪切變形影響顯著。對(duì)不可壓縮流體的孔隙方柱繞流采用二階精度時(shí)-空守恒元和解元(CE/SE)算法進(jìn)行了數(shù)值計(jì)算,分析了不同達(dá)西數(shù)、不同雷諾數(shù)等參數(shù)對(duì)流動(dòng)過程的影響。數(shù)值結(jié)果表明孔隙方柱繞流參數(shù)隨雷諾數(shù)變化規(guī)律與實(shí)體方柱繞流一致,受孔隙介質(zhì)影響,方柱邊界壓力及升力系數(shù)變化范圍相應(yīng)減小,渦脫頻率增大。
[Abstract]:The effect of fluid in the earthquake and active fault in the process is a typical hydrological geophysical problems, and slow slip and strain during earthquake rupture can accelerate the accumulation are closely related. The effect of pore pressure is the focus of attention, is also on the dynamic process of earthquake fluid core problem. This paper choose Sichuan Basin Shaxi Temple group sandstone core, carry out the rock fracturing microseismic seepage experiment and numerical analysis, explore the relationship between seismic activity and pore pressure evolution. The main conclusions are as follows. The rock fracture seepage microseismic experiment based on sandstone cores, three saturated uniaxial compression experiment, influence on rock physical activities study of acoustic emission of pore pressure and fluid saturation. The experimental results show that with the increase of confining pressure and pore pressure, the seismic wave velocity increases. The amplitude of seismic waves on the confining pressure Sensitive. Seismic compression wave then reveals the migration process of fluid. The pore pressure and saturation weakens the strength of the rock deformation and failure, shorten the time required. The pore pressure gradient on crack extension was significant. Application of FLAC3D software in view of the above three axial compression experiments were simulated. Derive the explicit finite difference scheme stability calculation of quasi side and implicit difference scheme. The seepage parameters of rock fracturing microseismic experiment, establish fully saturated numerical model of three axial compression under the condition of sandstone, sandstone failure process calculation of axial compression loading process and the drying condition. The upper and lower boundary extension methods to overcome the influence on the local shape of calculation interface results. By shortening the loading rate, the numerical iteration time into physical deformation time. The numerical results are consistent with the experimental results. The evolution of pore pressure To reveal the dynamic rock from elastic to plastic deformation and yield deformation and failure process. The pore pressure gradient on the effect of shear deformation on flow significantly. By two order precision around the pore column incompressible fluid and the space time conservation element (CE/SE) algorithm for the numerical calculation, analysis of the different Darcy number effects of different parameters, the Reynolds number of flow process. The numerical results show that the Reynolds number variation and solid flow around square cylinder consistent parameters of pore flow around a square cylinder, the influence of porous media, the variation range of square column boundary pressure and lift coefficient decrease, vortex shedding frequency increases.

【學(xué)位授予單位】：中國地震局地殼應(yīng)力研究所
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P315.8

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相關(guān)期刊論文 前2條

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本文編號(hào)：1547962