本文選題：大體積混凝土 + 凍結(jié)法鑿井��； 參考：《應(yīng)用基礎(chǔ)與工程科學(xué)學(xué)報(bào)》2017年02期

【摘要】：介紹了中國(guó)礦山凍結(jié)法鑿井井壁混凝土溫度問(wèn)題的現(xiàn)狀和發(fā)展,研究了井筒凍結(jié)相變導(dǎo)熱環(huán)境下大體積混凝土井壁溫度場(chǎng)數(shù)學(xué)模型;介紹了營(yíng)盤(pán)壕凍結(jié)副立井套內(nèi)壁的工程概況、垂深704m壁座結(jié)構(gòu)和溫度監(jiān)測(cè)方案,7個(gè)實(shí)測(cè)點(diǎn)數(shù)據(jù),圖形展示了混凝土澆筑72h內(nèi)井壁及圍巖的實(shí)測(cè)溫度發(fā)展.有限元數(shù)值模型計(jì)算獲得了對(duì)應(yīng)實(shí)測(cè)點(diǎn)的溫度數(shù)據(jù),和實(shí)測(cè)結(jié)果相當(dāng)接近,并預(yù)測(cè)了在停止凍結(jié)后直至全部融化的井壁及圍巖溫度分布發(fā)展情況.數(shù)值計(jì)算還原了井壁距內(nèi)緣深682mm測(cè)點(diǎn)2的一段丟失數(shù)據(jù),彌補(bǔ)了對(duì)測(cè)溫量程考慮不足導(dǎo)致數(shù)據(jù)丟失的遺憾,并顯示出在混凝土攪拌后37.5h時(shí)井壁測(cè)點(diǎn)最高溫度可達(dá)到92.3℃,高溫發(fā)生在內(nèi)壁中間部位,井壁內(nèi)外溫差最高達(dá)到了65℃以上,如此高的內(nèi)外溫差值得設(shè)計(jì)和施工人員關(guān)注.模型還揭示了停凍120d后凍結(jié)壁全部融化,即圍巖都上升到攝氏正溫以上.
[Abstract]:This paper introduces the present situation and development of the temperature problem of shaft wall concrete in Chinese mine freezing method, and studies the mathematical model of mass concrete wall temperature field under the condition of freezing phase change heat conduction of shaft. This paper introduces the engineering situation of the casing inner wall of freezing auxiliary shaft in Yingpan trench, the structure of vertical 704m wall pedestal and temperature monitoring scheme, the data of 7 measured points, and the actual temperature development of shaft lining and surrounding rock within 72 hours of concrete pouring. The temperature data of the corresponding measured points are obtained by the finite element numerical model, which is quite close to the measured results, and the temperature distribution of the shaft wall and surrounding rock after freezing and melting is predicted. The numerical calculation reduced the missing data of the 682mm measuring point 2 from the inner edge of the shaft wall, made up for the regret of missing the data caused by the insufficient consideration of the temperature measuring range, and showed that the maximum temperature of the shaft wall measuring point could reach 92.3 鈩，

本文編號(hào)：1970517