本文選題：巖石力學 + 水圍壓�。� 參考：《工程科學與技術》2017年S1期

【摘要】：水利工程中的壩基和庫岸巖體長期在高應力和高水壓的共同作用下會產(chǎn)生蠕變現(xiàn)象,對工程穩(wěn)定性影響很大。針對水利工程中巖石在流固耦合作用下的蠕變問題,選取某水電站引水隧道線路上震旦系砂巖為研究對象,利用MTS試驗機和掃描電鏡(SEM)分別對干燥和飽和狀態(tài)下砂巖的常規(guī)物理力學參數(shù)和微觀結構進行測試,分析砂巖在不同狀態(tài)下的主要物理參數(shù)和微觀結構變化;基于此,利用專用的微機控制軸壓水壓聯(lián)合作用巖石流變試驗系統(tǒng),通過對砂巖試樣施加不同的水圍壓,對其蠕變過程進行試驗研究,分析水壓對蠕變變形量、蠕變速率和長期強度的影響。結果表明:砂巖內(nèi)部存在大量的微孔隙,砂巖在飽水狀態(tài)下,呈現(xiàn)出軟化特性,飽水砂巖的抗壓強度與彈性模量均小于干燥砂巖;砂巖在穩(wěn)定蠕變階段的變形量隨水壓的增大而增加,水壓的增加降低了砂巖的強度和抵抗變形的能力,導致巖石初期和穩(wěn)定蠕變階段蠕變量的增大;水壓越高巖石蠕變的初始應變率越大,衰減至穩(wěn)定蠕變階段所需時間越長;水壓能通過巖石表面的孔隙滲入到巖石內(nèi)部,在裂紋發(fā)展的過程中,孔隙水壓力能及時到達裂紋尖端,形成"鍥入"作用,促使裂隙的擴展和貫通,加速巖石破壞變形,從而降低巖石的承載能力和長期強度。
[Abstract]:Under the action of high stress and high water pressure, the dam foundation and reservoir bank rock mass in water conservancy project will produce creep phenomenon for a long time, which has great influence on the engineering stability. Aiming at the creep problem of rock under fluid-solid coupling in hydraulic engineering, the Sinian sandstone on the diversion tunnel of a hydropower station is selected as the research object. The conventional physical and mechanical parameters and microstructure of sandstone under dry and saturated conditions were tested by MTS and SEM, respectively, and the main physical parameters and microstructure changes of sandstone in different states were analyzed. The creep process of sandstone specimen is studied by applying different water confining pressure to the rock rheological test system controlled by special microcomputer, and the amount of creep deformation caused by water pressure is analyzed. The influence of creep rate and long term strength. The results show that there are a large number of micropores in sandstone. The sandstone shows softening characteristics under saturated state. The compressive strength and elastic modulus of saturated sandstone are lower than that of dry sandstone. The deformation of sandstone in the stable creep stage increases with the increase of water pressure, and the increase of water pressure decreases the strength of sandstone and the ability to resist deformation, which leads to the increase of creep amount in the initial and stable creep stages of rock. The higher the water pressure, the greater the initial strain rate of rock creep, the longer the time needed to attenuate to the stable creep stage, and the longer the water pressure can penetrate into the rock through the pores of the rock surface, and in the process of crack development, Pore water pressure can reach the crack tip in time and form the role of "wedge in", which can promote the expansion and penetration of cracks, accelerate rock failure and deformation, and thus reduce the bearing capacity and long-term strength of rock.
【作者單位】： 四川大學水力學與山區(qū)河流開發(fā)保護國家重點實驗室;四川大學水利水電學院;四川電力設計咨詢有限責任公司;四川大學-香港理工大學災后重建與管理學院;
【基金】：國家自然科學基金煤炭聯(lián)合基金重點資助項目(51134018);國家自然科學基金資助項目(51369001)
【分類號】：TV223

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