本文選題：熱力耦合 + 水壓致裂　； 參考：《中國礦業(yè)》2017年07期

【摘要】：人工儲留層建造是高溫巖體地?zé)衢_采關(guān)鍵技術(shù)之一,其核心是巨型水壓致裂,關(guān)鍵科學(xué)問題是巖石熱力耦合作用下的水壓致裂理論。采用自主研制的"600℃20 MN伺服控制高溫高壓巖體三軸試驗(yàn)機(jī)",開展了Φ200mm×400mm的魯灰花崗巖大試樣高溫三軸應(yīng)力下的水壓致裂實(shí)驗(yàn),分析了實(shí)驗(yàn)的水壓加載曲線特征和裂縫最終形態(tài)。研究結(jié)果表明:隨溫度的升高,花崗巖裂縫開裂模式從脆性開裂轉(zhuǎn)變?yōu)檫B續(xù)開裂;溫度升高至300℃后,裂縫起裂的主控條件向溫度轉(zhuǎn)化;從室溫到200℃之間,溫度對花崗巖水壓致裂影響的控制機(jī)理是巖石抗拉強(qiáng)度的下降,而200℃到400℃起裂壓力的控制機(jī)理是溫度下降引起的熱應(yīng)力。隨著溫度的升高,裂縫的擴(kuò)展方向從軸向改變?yōu)閮?yōu)先向徑向深處發(fā)展。
[Abstract]:The formation of artificial reservoir is one of the key techniques for geothermal exploitation of high temperature rock mass, the core of which is the giant hydraulic fracturing, and the key scientific problem is the hydraulic fracturing theory under the coupling of rock and heat. The hydraulic fracturing experiment of 桅 200mm 脳 400mm large sample of Lu-gray granite under high temperature triaxial stress was carried out by using "600C 20mn servo control high temperature and high pressure rock mass triaxial test machine" developed by ourselves. The characteristics of hydraulic loading curve and the final fracture morphology of the experiment were analyzed. The results show that with the increase of temperature, the fracture mode of granite changes from brittle cracking to continuous cracking, and when the temperature rises to 300 鈩，

本文編號：1918335