本文選題：節(jié)理巖體　切入點：非貫通　出處：《三峽大學》2015年碩士論文

【摘要】：自然界中的巖體在漫長的地質(zhì)演變過程中，往往被大小、形狀、方向各異的結(jié)構(gòu)面縱橫切割，而形成具有一定結(jié)構(gòu)特征的不連續(xù)巖體，由于結(jié)構(gòu)面的存在，顯然不連續(xù)巖體的力學特性要比完整巖石復雜很多。本文對特定非貫通節(jié)理巖體試件進行了單軸壓縮試驗、常規(guī)三軸壓縮試驗和卸荷試驗，研究了特定非貫通節(jié)理巖體的加卸載條件下的力學特性，論文具體研究內(nèi)容如下： 1)對完整試件以及不同連通率(k=0.30、 k=0.45、 k=0.60)、不同節(jié)理數(shù)量及角度(β=30°、β=45°、β=60°、β=30°+45°、β=30°+60°)非貫通節(jié)理試樣進行單軸壓縮試驗、不同圍壓水平(2MPa、4MPa、6MPa、8MPa、10MPa)常規(guī)三軸壓縮試驗、卸荷(峰前卸荷)試驗；研究不同節(jié)理連通率、不同節(jié)理傾角、不同節(jié)理數(shù)量非貫通節(jié)理巖體試件加卸載條件下的力學特性，并與完整試件進行對比分析。結(jié)果表明在加卸載條件下非貫通節(jié)理巖體均表現(xiàn)出各向異性力學特性，這種各向異性特性表現(xiàn)隨著節(jié)理連通率的增大更為明顯。 2)非貫通節(jié)理巖石試件在加卸載試驗中所表現(xiàn)出來的力學特性、破壞形態(tài)、力學參數(shù)等具有明顯差異，巖體加卸荷狀態(tài)下具有不同的破壞機理；在卸荷條件下非貫通節(jié)理巖體試件均表現(xiàn)出明顯的脆性破壞特征，并且隨著連通率的增大這種特征表現(xiàn)得更加明顯。雙節(jié)理試件主要沿較大傾角節(jié)理面發(fā)生破壞。直線型Mohr-Coulomb強度準則和Hoek-Brown強度準則均能較好地表述非貫通節(jié)理巖體主應力之間的相互關系。 3)運用節(jié)理試樣三軸卸荷試驗的研究成果，對大崗山水電站某邊坡進行二維有限元計算，，對比監(jiān)測值與計算位移值表明：計算位移以及變化趨勢與監(jiān)測值一致，其量級也與監(jiān)測值一致，說明計算中選取模型和計算方法是合理的。
[Abstract]:In the long process of geological evolution, rock mass in nature is often cut vertically and horizontally by structural planes of different sizes, shapes and directions, and discontinuous rock masses with certain structural characteristics are formed because of the existence of structural planes.It is obvious that the mechanical properties of discontinuous rock mass are much more complicated than that of complete rock mass.In this paper, uniaxial compression tests, conventional triaxial compression tests and unloading tests are carried out on the specimens of certain non-transfixible jointed rock masses. The mechanical properties of specific non-transfixible jointed rock masses under loading and unloading conditions are studied. The main contents of this paper are as follows:The mechanical properties of rock mass specimens with different joint connectivity, different joint inclination and different joint number under loading and unloading conditions are studied and compared with the complete specimens.The results show that the unconnected rock masses exhibit anisotropic mechanical properties under loading and unloading conditions, and this anisotropic property is more obvious with the increase of joint connectivity.2) there are obvious differences in mechanical properties, failure patterns and mechanical parameters of non-through jointed rock specimens in loading and unloading tests, and there are different failure mechanisms under loading and unloading of rock masses;Under unloading condition, the specimens of non-through-jointed rock mass all show obvious brittle failure characteristics, and with the increase of connectivity, this characteristic is more obvious.The failure of double joint specimens mainly occurs along the large inclined joint surface.Both the linear Mohr-Coulomb strength criterion and the Hoek-Brown strength criterion can describe the relationship between the principal stresses of non-transfixion jointed rock mass.3) based on the research results of triaxial unloading test of jointed specimens, a slope of Dagangshan Hydropower Station is calculated by two-dimensional finite element method. The comparison between the monitoring value and the calculated displacement value shows that the calculated displacement and the variation trend are consistent with the monitoring values.The order of magnitude is the same as the monitoring value, which shows that the selection of model and calculation method is reasonable.
【學位授予單位】：三峽大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU45

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本文編號：1726515