本文選題：水力壓裂 + 起裂壓力　； 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：水力壓裂技術(shù)廣泛應(yīng)用于多個工程領(lǐng)域且已得到有效發(fā)展。在煤礦開采中,水力壓裂技術(shù)通過向煤層中注入高壓水破碎煤體、浸潤煤體,促使煤體沖擊危險性向深部轉(zhuǎn)移,達(dá)到有效緩解沖擊地壓的目的。由于現(xiàn)場水力壓裂技術(shù)具有不可重復(fù)性,近年來學(xué)者將研究焦點(diǎn)轉(zhuǎn)向?qū)嶒炇?然而實(shí)驗室實(shí)驗的不完善、可靠性以及實(shí)驗結(jié)果缺少評價成為本文的研究重點(diǎn)。本文采用理論研究、實(shí)驗研究和數(shù)值模擬分析的方法進(jìn)行水力壓裂實(shí)驗研究,一方面對水力壓裂實(shí)驗進(jìn)行補(bǔ)充,另一方面通過理論分析和數(shù)值模擬的比較驗證實(shí)驗的可靠性,并對實(shí)驗進(jìn)行探索性評價,主要包括以下內(nèi)容:(1)實(shí)驗室水力壓裂實(shí)驗通過儀器合理布置與實(shí)驗的前期處理保證試樣能順利進(jìn)行,同時通過同種材料不同配比得出的不同單軸抗壓強(qiáng)度的試樣,且隨著單軸抗壓強(qiáng)度的增加水力壓裂實(shí)驗的試樣起裂壓力升高。(2)通過水力壓裂實(shí)驗過程中的水壓檢測與試樣起裂過程觀察,得出不同單軸抗壓強(qiáng)度試樣在水力壓裂不同階段的試樣表面滲透情況與水壓變化過程各階段之間的關(guān)系,同時觀察得到不同配比的試樣其水壓升高、起裂以及破裂的時間特點(diǎn);(3)通過ANSYS模擬軟件輸出的數(shù)據(jù)與實(shí)驗中各階段數(shù)據(jù)的計算結(jié)果誤差較小,為1.33%、0.98%、0.87%,因此可認(rèn)為實(shí)驗結(jié)果是較為準(zhǔn)確且實(shí)驗并沒有破壞試樣的斷裂力學(xué)性能,證明了實(shí)驗的準(zhǔn)確信,確保了實(shí)驗的可信度。(4)通過多組實(shí)驗的數(shù)據(jù)整理和記錄,通過能量法與面積分?jǐn)?shù)法的相互驗證,得出同種配比的試樣其起裂效果隨著起裂壓力的升高,能量釋放越充分、破裂面面積分型維數(shù)越大,裂隙發(fā)育效果越好。
[Abstract]:Hydraulic fracturing technology is widely used in many engineering fields and has been developed effectively. In coal mining, hydraulic fracturing technology by injecting high pressure water into the coal seam to break coal body, infiltrate coal body, promote the coal body impact risk to the deep transfer, to achieve the purpose of reducing the impact ground pressure effectively. Because the field hydraulic fracturing technology is not repeatable, in recent years, the research focus has been turned to the laboratory. However, the imperfection, reliability and lack of evaluation of the experimental results have become the focus of this paper. In this paper, theoretical research, experimental research and numerical simulation analysis are used to study the hydraulic fracturing experiment. On the one hand, the hydraulic fracturing experiment is supplemented; on the other hand, the reliability of the experiment is verified by theoretical analysis and numerical simulation. And the exploratory evaluation of the experiment includes the following contents: 1) the hydraulic fracturing experiment in the laboratory can be carried out smoothly through the reasonable arrangement of the instrument and the preliminary treatment of the experiment. At the same time, the specimens with different uniaxial compressive strength obtained from different proportions of the same material, With the increase of uniaxial compressive strength, the fracture initiation pressure of hydraulic fracturing test samples is increased. The relationship between the surface permeability of samples with different uniaxial compressive strength at different stages of hydraulic fracturing and each stage of hydraulic pressure change is obtained. At the same time, the water pressure of samples with different ratios is observed. The time characteristics of crack initiation and rupture are as follows: (1) the error between the data output by ANSYS simulation software and the data of each stage in the experiment is relatively small, which is 1.330.98 / 0.87. therefore, it can be considered that the experimental results are more accurate and do not destroy the fracture mechanical properties of the specimens. The accuracy of the experiment is proved, and the reliability of the experiment is ensured. (4) through the data collation and recording of many groups of experiments and the mutual verification of the energy method and the area fraction method, it is concluded that the initiation effect of the specimen of the same proportion increases with the initiation pressure. The more energy is released, the larger the integral dimension of fracture surface is, and the better the effect of fracture development is.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD712.6

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