本文選題：砂巖 + 高溫��； 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：隨著深部煤礦的不斷開采,遇到各種復(fù)雜的地質(zhì)環(huán)境,深部巖體的力學(xué)行為已經(jīng)成為一個關(guān)乎民生大計的重要課題,也將是未來巖體力學(xué)研究的熱點及重點領(lǐng)域之一。另外,在能源、地質(zhì)、土建等其他關(guān)乎民生大計的地方,例如核廢料的深層埋置、石油及天然氣的地下開采及存儲以及地?zé)豳Y源的開發(fā)與利用等都涉及到高溫下巖石的力學(xué)特征。因此,研究高溫下巖石的力學(xué)性質(zhì),特別是高溫下巖石的動態(tài)力學(xué)性能,將會對今后的工程實踐與理論研究產(chǎn)生巨大的意義。本文通過SHPB高溫實驗裝置對不同溫度下的煤礦深部砂巖進行了動態(tài)沖擊壓縮實驗及動態(tài)劈裂拉伸實驗,分析了砂巖峰值應(yīng)力隨溫度變化的規(guī)律以及砂巖的破壞情況,研究了砂巖的動態(tài)力學(xué)特性;同時對不同溫度的砂巖巖樣進行SEM和XRD實驗,觀察了試樣的斷口形貌,分析了巖樣的組成成分。主要研究內(nèi)容和成果如下:(1)在常溫(20℃)～700℃下對砂巖進行0.3MPa、0.5MPa和0.7MPa三種沖擊氣壓下的動態(tài)單軸壓縮實驗,分析了砂巖峰值應(yīng)力隨溫度變化的規(guī)律,隨溫度的變化砂巖的峰值應(yīng)力大致經(jīng)歷平緩-上升-下降三個過程。從試件的破碎情況圖中也可看出,每種溫度類別下,隨著沖擊氣壓的增大,砂巖的破碎程度也加大,由完整的短圓柱體破壞為塊狀或粉狀。(2)在常溫(20℃)～700℃下對砂巖進行0.3MPa、0.5MPa和0.7MPa三種沖擊氣壓下的動態(tài)劈裂拉伸實驗,得出隨著溫度的上升,砂巖的峰值抗拉強度表現(xiàn)出由上升到下降的過程;隨著沖擊氣壓的增大,砂巖試件的應(yīng)變率也在增大,在時間為50～300μs應(yīng)變率形成一段較為平穩(wěn)的平臺。(3)對砂巖巖樣進行SEM和XRD實驗,觀察了試樣的斷口形貌,分析了巖樣的組成成分,分析了砂巖成分隨溫度的變化情況,得到砂巖巖樣在溫度—應(yīng)力共同作用下的裂紋擴展規(guī)律。
[Abstract]:With the continuous exploitation of deep coal mines and various complicated geological environments, the mechanical behavior of deep rock mass has become an important issue related to the livelihood of the people, and will also be one of the hotspots and key areas of rock mechanics research in the future. In addition, in energy, geology, civil engineering and other places of great concern to people's livelihood, such as the deep burial of nuclear waste, The underground exploitation and storage of oil and natural gas and the exploitation and utilization of geothermal resources are all related to the mechanical characteristics of rocks at high temperature. Therefore, studying the mechanical properties of rocks at high temperature, especially the dynamic mechanical properties of rocks at high temperature, will be of great significance to the engineering practice and theoretical research in the future. In this paper, the dynamic impact compression test and dynamic splitting tensile test of deep sandstone in coal mine at different temperatures are carried out by using SHPB high temperature experimental device. The law of the change of peak stress of sandstone with temperature and the failure of sandstone are analyzed. The dynamic mechanical properties of sandstone were studied, and the SEM and XRD experiments of sandstone rock samples at different temperatures were carried out. The fracture morphology of the samples was observed and the composition of rock samples was analyzed. The main research contents and results are as follows: (1) dynamic uniaxial compression experiments of sandstone under 0.3 MPA and 0.7MPa impact pressure at 20 鈩，

本文編號：1929649