本文選題：凝灰質(zhì)粉砂巖 + 含水量��； 參考：《西華大學》2017年碩士論文

【摘要】：自然界中水和巖石是同時存在的,且二者之間進行著繁雜的物理和化學作用,影響巖石的力學特性特性。自然界中水對巖石的浸蝕破壞是從巖石結(jié)構(gòu)表面開始的,因此同類巖石的力學性質(zhì)在不同含水狀態(tài)環(huán)境下的力學性質(zhì)差異很大。在隧道的開挖和支護中精確把握住巖石的力學性質(zhì)是工程安全、質(zhì)量和進度的保證。所以探究不同含水狀態(tài)下巖石的力學特性就顯得十分重要,是地下空間與隧道界研究的一個重中之重的課題。本文將浙江省麗水市路灣隧道的凝灰質(zhì)粉砂巖作為研究對象,利用理論與試驗相結(jié)合的思路,探究了不同含水狀態(tài)下的凝灰質(zhì)粉砂巖的力學特性。主要內(nèi)容如下:(1)取少量巖樣的粉晶樣品送成都理工大學材料與化學化工學院綜合實驗中心,通過DX-2700 X射線衍射儀分析凝灰質(zhì)粉砂巖物質(zhì)成分和含量。(2)通過凝灰質(zhì)粉砂巖在自然狀態(tài)下的吸水性試驗。了解凝灰質(zhì)粉砂巖自然吸水率和時間之間的曲線關(guān)系,據(jù)此設(shè)定了直剪、單軸壓縮和三軸壓縮試驗中巖樣的泡水時間點。(3)使用成都理工大學自主研發(fā)的攜帶式巖石力學多功能試驗儀進行不同浸水時間下標準試樣的直剪試驗。以試驗結(jié)果為依據(jù),分析浸水時間與含水率之間的曲線關(guān)系,從而獲得剪切力及力學參數(shù)與浸水時間之間的關(guān)系,構(gòu)建以浸水時間t為因量的MohrCoulomb準則。(4)使用MTS巖石綜合測試系統(tǒng)對凝灰質(zhì)粉砂巖進行常溫下不同浸水狀態(tài)下的單軸壓縮試驗。得到不同浸水狀態(tài)下的巖樣σ-ε曲線關(guān)系、單軸抗壓強度和力學參數(shù),研究浸水時間與含水率之間的關(guān)系,進而探究浸水時間對巖石強度、變形及各力學參數(shù)的影響,并建立以浸水時間為變量的巖石本構(gòu)關(guān)系。(5)使用MTS815.03型巖石三軸伺服剛性試驗機進行自然狀態(tài)下3σ=5、10、25、40、60MPa的三軸壓縮試驗。得到不同圍壓的巖樣σ-ε曲線、巖石強度和力學參數(shù)。進而研究圍壓對巖石強度、破壞特征及各力學參數(shù)的影響并建立常規(guī)三軸本構(gòu)方程。(6)使用MTS815.03型巖石三軸伺服剛性試驗機進行3σ=60MPa高圍壓不同浸水狀態(tài)下的三軸壓縮試驗。得到浸水時間t=0、4、12、360h下的巖樣的三軸σ-ε曲線、三軸抗壓強度和力學參數(shù)。進而研究浸水時間和含水率在高圍壓下對巖石強度、變形及各力學參數(shù)的影響并建立以浸水時間為變量的巖石三軸損傷本構(gòu)關(guān)系。
[Abstract]:In nature, water and rock exist at the same time, and there are a lot of physical and chemical interactions between them, which affect the mechanical properties of rock. The erosion failure of rock by water in nature starts from the surface of rock structure, so the mechanical properties of the same rock in different water-bearing conditions are very different. It is the guarantee of engineering safety, quality and schedule to accurately grasp the mechanical properties of rock in the excavation and support of tunnel. Therefore, it is very important to explore the mechanical properties of rock in different water-bearing states, which is the most important subject in the study of underground space and tunnel boundary. In this paper, the tuffaceous siltstone in Luwan Tunnel of Lishui City, Zhejiang Province, is taken as the research object, and the mechanical properties of tuffaceous siltstone under different water-bearing conditions are explored by combining theory with experiment. The main contents are as follows: (1) take a small amount of rock samples of powdery crystals and send them to the Comprehensive Experimental Center of the School of Materials and Chemical Engineering, Chengdu University of Technology, The material composition and content of tuffaceous siltstone were analyzed by DX-2700 X-ray diffractometer. The relationship between the natural water absorption rate and the time of tuffaceous siltstone is understood. In uniaxial compression test and triaxial compression test, the time point of water bubble of rock samples was measured by means of the portable multifunctional rock mechanics tester developed by Chengdu University of Technology. The direct shear tests of standard samples were carried out under different soaking times by using the portable multifunction test instrument developed by Chengdu University of Science and Technology (Chengdu University of Science and Technology). Based on the experimental results, the relationship between soaking time and water content is analyzed, and the relationship between shear force, mechanical parameters and soaking time is obtained. In this paper, the MohrCoulomb criterion, which is based on the factor t of soaking time, is constructed. (4) the uniaxial compression tests of tuffaceous siltstones under different soaking conditions are carried out under normal temperature by using MTS rock comprehensive test system. The relations of 蟽-蔚 curves, uniaxial compressive strength and mechanical parameters of rock samples under different soaking conditions are obtained. The relationship between soaking time and water content is studied, and the influence of soaking time on rock strength, deformation and mechanical parameters is explored. The constitutive relation of rock with immersion time as variable was established. The MTS815.03 triaxial servo rigid testing machine was used to carry out the triaxial compression tests under natural condition. The 蟽-蔚 curves, rock strength and mechanical parameters of rock samples with different confining pressures are obtained. Furthermore, the influence of confining pressure on rock strength, failure characteristics and mechanical parameters was studied, and a conventional triaxial constitutive equation was established. The triaxial compression tests were carried out under 3 蟽 60 MPA high confining pressure under different immersion conditions using MTS815.03 type rock triaxial servo rigid test machine. The triaxial 蟽-蔚 curves, triaxial compressive strength and mechanical parameters of the rock samples were obtained at the immersion time t 0 ~ (0) ~ (4) ~ (3) ~ (3) ~ (3) ~ (3) ~ (36) h. The influences of immersion time and water content on the strength, deformation and mechanical parameters of rock under high confining pressure were studied and the constitutive relation of rock triaxial damage was established.
【學位授予單位】：西華大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU452

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