本文選題：井壁保護(hù) + 溫度場(chǎng)��； 參考：《煤炭科學(xué)研究總院》2016年碩士論文

【摘要】：近年來,我國西部地區(qū)礦井建設(shè)全面展開,普通法施工西部礦井發(fā)生井筒淹水事故后多采用凍結(jié)法完成事故井施工；凍結(jié)法處理事故井過程中,面臨著許多工程技術(shù)難題。論文以凍結(jié)法施工的塔什店礦區(qū)一號(hào)礦風(fēng)井已成型井壁保護(hù)問題為主線,運(yùn)用理論分析、數(shù)值模擬和現(xiàn)場(chǎng)實(shí)測(cè)相結(jié)合的方法,著力于凍土力學(xué)性能試驗(yàn)、溫控條件下凍結(jié)溫度場(chǎng)演化規(guī)律、凍結(jié)應(yīng)力場(chǎng)分布情況、基于工程實(shí)測(cè)的數(shù)值反演等方面開展的研究。針對(duì)礦區(qū)井筒檢查孔取芯試樣進(jìn)行了較全面的凍土物理力學(xué)試驗(yàn),試驗(yàn)結(jié)果顯示,低溫下巖樣單軸抗壓強(qiáng)度低,均不足10MPa；蠕變?cè)囼?yàn)揭示巖樣為非穩(wěn)定蠕變,溫度、應(yīng)力和時(shí)間是影響凍土蠕變的關(guān)鍵因素；無水源補(bǔ)給的條件下巖樣均有凍脹性。采用ANSYS軟件,根據(jù)凍土試驗(yàn)得到的熱力學(xué)參數(shù)建立溫控條件下凍結(jié)溫度場(chǎng)模型并進(jìn)行有限元分析,結(jié)果表明溫控孔開啟后凍結(jié)溫度場(chǎng)等溫線以凍結(jié)孔為中心呈同心圓發(fā)展趨勢(shì),在溫控孔附近等溫線呈內(nèi)凹狀；凍結(jié)主面特征曲線在溫控孔處發(fā)生突變,影響凍結(jié)壁發(fā)展。采用間接耦合的方法進(jìn)行熱應(yīng)力分析,得到凍結(jié)應(yīng)力場(chǎng)分布云圖,顯示凍結(jié)壁內(nèi)積聚凍脹力,溫控孔作用范圍內(nèi)起到應(yīng)力緩沖的效果。對(duì)比開啟和未開啟溫控孔情況下凍結(jié)溫度場(chǎng)與應(yīng)力場(chǎng)特征參數(shù),體現(xiàn)溫控孔設(shè)置對(duì)工程的實(shí)踐意義,為井壁保護(hù)提供參考。最后,基于現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)進(jìn)行數(shù)值反演得到地層仿真模型,利用模型推演出溫控孔最佳開啟時(shí)機(jī)70d和最佳開啟溫度10℃～15℃指導(dǎo)工程施工。工程實(shí)際施工效果良好,同時(shí)驗(yàn)證了模擬結(jié)果的可靠性和科學(xué)性。
[Abstract]:In recent years, the mine construction in the west of China has been carried out in an all-round way. The freezing method is often used to complete the construction of the accident wells after the shaft flooding accident occurs in the west of China, and the freezing method is faced with many technical problems in the process of dealing with the accident wells. The main line of the paper is the protection of the formed shaft wall of the No. 1 mine wind shaft in Tashhidian mining area, which is constructed by freezing method. By using the method of theoretical analysis, numerical simulation and field measurement, the paper focuses on the test of the mechanical properties of permafrost. The evolution law of freezing temperature field, the distribution of frozen stress field and the numerical inversion based on engineering measurements are studied in this paper. A comprehensive physical and mechanical test of permafrost was carried out for the core sample of wellbore inspection in mining area. The test results show that the uniaxial compressive strength of rock sample is low at low temperature, which is less than 10 MPA, and the creep test reveals that the rock sample is unstable creep and temperature, Stress and time are the key factors affecting the creep of frozen soil. Using ANSYS software, according to the thermodynamic parameters obtained from the frozen soil test, the model of freezing temperature field under the condition of temperature control is established and the finite element analysis is carried out. The results show that the isotherm of freezing temperature field takes the freezing hole as the center of the development trend of concentric circle after the opening of the temperature control hole. The isotherm is concave near the temperature-controlled hole, and the characteristic curve of the freezing main surface changes at the temperature controlled hole, which affects the development of the freezing wall. An indirect coupling method is used to analyze the thermal stress, and the distribution of the frozen stress field is obtained, which shows that the freezing heaving force is accumulated in the frozen wall and the effect of stress buffering is obtained in the range of temperature controlled holes. By comparing the characteristic parameters of freezing temperature field and stress field between open and unopened temperature controlled holes, the practical significance of temperature control hole setting for engineering is reflected, and the reference for wellbore protection is provided. Finally, the formation simulation model is obtained by numerical inversion based on the field measured data, and the optimum opening time of temperature control hole is 70 days and the optimum opening temperature is 10 鈩，

本文編號(hào)：2055334