本文選題：非貫通　切入點：節(jié)理巖體　出處：《三峽大學》2014年碩士論文　論文類型：學位論文

【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。本文對非貫通節(jié)理巖體試件進行了聲波波速測試、單軸壓縮試驗、常規(guī)三軸壓縮試驗和卸荷試驗，研究了非貫通節(jié)理巖體的聲學特性和加卸載條件下的力學特性，論文具體研究內(nèi)容如下： 1)對試驗所需的試驗設(shè)備進行設(shè)計，，包括對巖石切割機進行滿足試驗要求的相關(guān)升級改造，改造后的切割機可以方便切割不同節(jié)理傾角、不同節(jié)理連通率的試件。 2)不同連通率、不同角度非貫通節(jié)理巖體的縱波波速測試，研究其聲波波速隨著節(jié)理連通率、節(jié)理傾角的變化特征以及衰減規(guī)律。結(jié)果表明隨著節(jié)理連通率的增大，縱波波速在非貫通節(jié)理試件的中的傳播速度在各個角度節(jié)理傾角下均有明顯的減小趨勢；在縱波波速衰減率對節(jié)理傾角的敏感性（敏感性用μ表示）大小依次為：μ0°μ30°μ45°μ60°μ90°。 3)完整巖石試件以及不同連通率(k=0.25、k=0.5、k=0.75)、不同角度(β=0°、β=30°、β=45°、β=90°、β=60°)非貫通節(jié)理巖體單軸壓縮試驗、不同圍壓水平(5MPa、10MPa、15MPa、20MPa)下常規(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)理傾角非貫通節(jié)理巖體試件加卸載條件下的峰值強度、變形參數(shù)、強度參數(shù)、破壞形式等特征，并與完整試件進行對比分析。結(jié)果表明非貫通節(jié)理巖體加卸載條件下均表現(xiàn)出各向異性力學特性，且隨著節(jié)理連通率的增大，這種各向異性特性表現(xiàn)的更為明顯。 4)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)出明顯的延性破壞特征，并且隨著連通率的增大這種特征表現(xiàn)得更加明顯。 5)直線型Mohr-Coulomb強度準則、拋物線型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(yīng)力之間的相互關(guān)系，相比而言，拋物線型Mohr-Coulomb強度準則和Hoek-Brown強度準則更能準確表述非貫通節(jié)理巖石試件加卸載條件下主應(yīng)力之間的相互關(guān)系。 6)根據(jù)節(jié)理巖體的加卸載試驗，對單一非貫通節(jié)理巖體的加卸載屈服準則,進行了探討，將巖體的非貫通節(jié)理看做是一種損傷，根據(jù)巖體破壞過程的應(yīng)力-應(yīng)變曲線變化特征，引入損傷變量，將加卸荷破壞曲線分為線彈性段、理想彈塑性段、非線性應(yīng)變軟化段、線性殘余塑性流動段4段，并推導了相應(yīng)的本構(gòu)關(guān)系。
[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 intact rock mass. In this paper, the acoustic wave velocity, uniaxial compression test, conventional triaxial compression test and unloading test are carried out for non-transfixion rock mass specimens. The acoustical characteristics and mechanical properties of non-through-jointed rock mass under loading and unloading conditions are studied in this paper. The main contents of this paper are as follows:. 1) the test equipment needed for the test is designed, including the upgrading of rock cutting machine to meet the test requirements. The modified cutting machine can easily cut specimens with different joint inclination and different joint connectivity. 2) the longitudinal wave velocities of rock masses with different connectivity and angles are measured, and the variation characteristics of acoustic wave velocities with joint connectivity, joint inclination and attenuation are studied. The results show that with the increase of joint connectivity, The velocities of P-wave wave propagating in non-transfixion joint specimens have an obvious decreasing trend at all angles, and the sensitivity (expressed in 渭) of the attenuation rate of P-wave velocities to the inclination angles of joints is 渭 0 擄渭 30 擄渭 45 擄渭 60 擄渭 90 擄. 3) intact rock specimens and different connectivity ratios of 0.25kU 0.5kL 0.75, different angles (尾 0 擄, 尾 30 擄, 尾 -45 擄, 尾 -90 擄, 尾 -60 擄), uniaxial compression tests of non-penetrating jointed rock masses, conventional triaxial compression tests with different confining pressure levels of 5MPa 10MPa 15MPa / 20MPa, unloading tests (unloading before peak loading), and studies on the connectivity of different joints. The characteristics of peak strength, deformation parameter, strength parameter, failure form and so on under the condition of loading and unloading of non-transfixion jointed rock mass specimens with different joint dip angles, The results show that the anisotropic mechanical properties of rock mass are anisotropic under loading and unloading conditions, and the anisotropy is more obvious with the increase of joint connectivity. 4) 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 mass. Under unloading condition, the specimens of non-transfixible jointed rock mass show obvious ductile failure characteristics, and this characteristic is more obvious with the increase of connectivity. 5) the linear Mohr-Coulomb strength criterion, parabolic Mohr-Coulomb strength criterion and Hoek-Brown strength criterion can better describe the relationship between the principal stresses of non-transfixion jointed rock mass. The parabolic Mohr-Coulomb strength criterion and the Hoek-Brown strength criterion can more accurately describe the relationship between the principal stresses under the loading and unloading conditions of rock specimens with non-transfixion joints. 6) according to the loading and unloading test of jointed rock mass, the loading and unloading yield criterion of single non-transfixion jointed rock mass is discussed. The non-transfixion joint of rock mass is regarded as a kind of damage, and according to the characteristic of stress-strain curve of rock mass failure process, By introducing damage variable, the failure curve of loading and unloading is divided into four sections: linear elastic section, ideal elastic-plastic section, nonlinear strain softening section, linear residual plastic flow section, and the corresponding constitutive relation is derived.
【學位授予單位】：三峽大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU45

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