發(fā)布時間：2018-10-22 11:10

【摘要】：巖體是由不同形態(tài)與力學性質(zhì)的結(jié)構(gòu)面切割而成的非連續(xù)體。巖體的破壞大多始于結(jié)構(gòu)面,而結(jié)構(gòu)面的破壞主要為剪切破壞。大部分學者認為結(jié)構(gòu)面抗剪強度與尺寸有關(guān),而對應(yīng)力效應(yīng)研究尚不足。本文基于室內(nèi)試驗與數(shù)值模擬的手段,通過自主研制的巖體結(jié)構(gòu)面直剪試驗儀,開展了單齒型結(jié)構(gòu)面的直剪試驗研究,分析結(jié)構(gòu)面抗剪強度的應(yīng)力效應(yīng)變化規(guī)律,并在此基礎(chǔ)上做了如下工作:1.自主研發(fā)了可用于測試應(yīng)力效應(yīng)的巖體結(jié)構(gòu)面直剪試驗儀,該直剪儀試驗結(jié)果與現(xiàn)有數(shù)據(jù)一致,研發(fā)的巖體結(jié)構(gòu)面直剪儀是可靠的。2.通過四種配合比試樣的單軸壓縮試驗確定直剪試驗采用的法向應(yīng)力值。考慮了齒角、齒高、工序、組裝難易度等因素,自主研發(fā)了結(jié)構(gòu)面制作模具。3.通過對平直型與單齒型結(jié)構(gòu)面進行直剪試驗可得,平直型結(jié)構(gòu)面抗剪強度不存在應(yīng)力效應(yīng);單齒型結(jié)構(gòu)面抗剪強度存在應(yīng)力效應(yīng),表現(xiàn)為隨著法向應(yīng)力增加,峰值抗剪強度呈現(xiàn)出先增加然后趨于穩(wěn)定的趨勢。4.采用歸一化的方式,考慮了結(jié)構(gòu)面粗糙程度、法向應(yīng)力、壁巖強度、基本摩擦角等因素對抗剪強度的影響可得,平直結(jié)構(gòu)面峰值摩擦角不存在應(yīng)力效應(yīng);單齒型結(jié)構(gòu)面峰值摩擦角存在應(yīng)力效應(yīng),表現(xiàn)為隨著法向應(yīng)力增加,峰值摩擦角呈現(xiàn)出先減小然后趨于穩(wěn)定的趨勢。5.單齒型結(jié)構(gòu)面峰值抗剪強度與起伏角、鋸齒高度及鋸齒面積等有關(guān),在其它因素不變的情況下,隨著鋸齒高度增加,峰值抗剪強度呈現(xiàn)出近似線性增加的趨勢,鋸齒面積對抗剪強度影響也表現(xiàn)出同樣的規(guī)律。6.通過顆粒流建立單鋸齒型結(jié)構(gòu)面數(shù)值模型進行直剪試驗,將數(shù)值模擬結(jié)果和室內(nèi)試驗結(jié)果進行了對比分析,得出了近似一致的結(jié)論。
[Abstract]:Rock mass is a discontinuous body which is cut by different shape and mechanical properties. The failure of rock mass starts from the structural plane, and the failure of the structural plane is mainly shear failure. Most scholars think that the shear strength of structural plane is related to the size, but the study of stress effect is not enough. Based on indoor test and numerical simulation, the direct shear test of single tooth structural plane is carried out by using the self-developed direct shear test instrument of rock mass structure plane, and the stress effect of shear strength of structural plane is analyzed. On this basis, the following work has been done: 1. A direct shear test instrument for rock mass structure plane is developed, which can be used to test stress effect. The test results are consistent with the available data, and the developed direct shear apparatus for rock mass structure plane is reliable. The normal stress value of direct shear test was determined by uniaxial compression test of four kinds of mix ratio samples. Considering the factors of tooth angle, tooth height, working procedure, assembly difficulty, etc. Through the direct shear test of straight and single-tooth structural planes, it can be found that there is no stress effect on shear strength of flat straight structural plane, and stress effect exists on shear strength of single tooth structural plane, which shows that the shear strength increases with normal stress. The peak shear strength increased first and then tended to be stable. 4. The effects of roughness, normal stress, wall rock strength and basic friction angle on shear strength are considered in a normalized way, but there is no stress effect on the peak friction angle of flat plane. The stress effect exists in the peak friction angle of single-tooth structure plane, which shows that the peak friction angle decreases first and then tends to be stable with the increase of normal stress. The peak shear strength of single-toothed structural plane is related to the fluctuation angle, sawtooth height and sawtooth area. When other factors are not changed, the peak shear strength increases linearly with the increase of serrated height. The effect of sawtooth area on shear strength also shows the same law. 6. The numerical model of single sawtooth structure plane is established by particle flow to carry out direct shear test. The numerical simulation results are compared with the results of laboratory tests, and an approximate consistent conclusion is obtained.
【學位授予單位】：浙江科技學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU45

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本文編號：2286988