【摘要】：節(jié)理面通常是巖體的薄弱面,在實際工程中巖體的破壞大多因節(jié)理引起,而節(jié)理表面幾何形態(tài)又是控制巖體力學(xué)的重要因素�；诖�,本文主要研究了規(guī)則形狀與隨機形狀的節(jié)理面在剪切過程中形貌與應(yīng)力的演化規(guī)律,主要成果如下:(1)剪切過程中鋸齒狀節(jié)理面的形貌變化:形貌的高度均方根與坡度均方根的變化規(guī)律為:初期較平緩,之后斷崖式下跌,最后趨近平穩(wěn);自相關(guān)函數(shù)曲線幾乎水平不變。(2)剪切過程中鋸齒狀節(jié)理面的應(yīng)力演化:節(jié)理面附近區(qū)域的拉應(yīng)力曲線呈起伏波浪狀,其絕大多數(shù)峰值點約為0.5·σn'。節(jié)理面附近區(qū)域的壓應(yīng)力曲線呈矩形脈沖狀,其曲線的下限值約為-2.5·σn。接觸壓應(yīng)力曲線呈矩形脈沖狀,曲線近似為同周期恒振幅的振蕩變化,波動范圍為(0.2～1.5)Λσn。剪應(yīng)力曲線呈矩形脈沖狀,曲線波動范圍是f.(0.2～1.5)·σ.n,形貌變化對剪切應(yīng)力的貢獻為0.2·σn ·f,剪應(yīng)力與接觸壓應(yīng)力的比值為摩擦系數(shù)。節(jié)理面最小接觸面積與全接觸面積的比值為26.7%。節(jié)理面的張開距離呈現(xiàn)周期性。(3)剪切過程中JRC曲線節(jié)理面的形貌變化:形貌的的高度均方根、坡度均方根、自相關(guān)函數(shù)逐漸減小,最后趨于穩(wěn)定。(4)剪切過程中JRC曲線形貌節(jié)理面的應(yīng)力演化:不同形貌節(jié)理面附近區(qū)域的拉應(yīng)力、壓應(yīng)力差異極大;相同形貌節(jié)理面附近區(qū)域的壓應(yīng)力與拉應(yīng)力規(guī)律類似,其出現(xiàn)峰值的位置也接近,峰點處其值較大,隨著遠離各峰點其值趨近于0。不同形貌的接觸壓應(yīng)力、剪應(yīng)力差異極大;相同形貌的接觸壓應(yīng)力與剪應(yīng)力規(guī)律類似且出現(xiàn)峰值的位置接近。接觸壓應(yīng)力、剪應(yīng)力的峰點處其值較大,隨著遠離各峰點其值趨近于0。整個剪切過程中應(yīng)力曲線的峰值個數(shù)點逐漸減少。同一剪切試驗剪應(yīng)力與接觸壓應(yīng)力的比值為摩擦系數(shù)。張開距離的變化為:曲線急劇上升至峰值點,再下降,最后趨近水平。不同的JRC節(jié)理形貌接觸面積曲線變化規(guī)律基本相同,接觸面積與剪切位移可以擬合為y=axb曲線。
[Abstract]:Joint plane is usually the weak plane of rock mass. In practical engineering, the failure of rock mass is mostly caused by joint, and the geometry of joint surface is an important factor to control rock mechanics. Based on this, the evolution of the shape and stress of joints with regular shape and random shape in shear process is studied in this paper. The main results are as follows: (1) the morphologies of sawtooth joints during shearing: the variation law of the high RMS and the RMS of slope is: the initial stage is relatively flat, then the cliff-like decline, and the final approach is stable; The autocorrelation function curve is almost constant. (2) the stress evolution of sawtooth joints in shear process: the tensile stress curves near the joints show undulating wave shape, and most of the peak points are about 0.5 蟽 ng. The compressive stress curve near the joint surface is rectangular pulse shape, and the lower limit of the curve is about -2.5 蟽 n. The contact compressive stress curve shows a rectangular pulse shape, and the curve is approximately oscillatory with the same period and constant amplitude, and the fluctuation range is (0.22 ~ (1.5) A 蟽 ~ (n). The shear stress curve is rectangular pulse shape, the fluctuation range of the curve is f. (0.2n. 5) 蟽. N. The contribution of the shape change to the shear stress is 0.2 蟽 n f, and the ratio of shear stress to contact compressive stress is friction coefficient. The ratio of the minimum contact area to the total contact area of the joint plane is 26.7. The opening distance of joint surface is periodic. (3) the morphology of JRC curve joints changes: the height of RMS root of morphology, the root of slope RMS, the autocorrelation function decrease gradually. (4) the stress evolution of the joint surface of the JRC curve during shear process: the tensile stress in the region near the joint plane with different morphologies varies greatly, the compressive stress in the area near the same joint surface is similar to the tensile stress law, and the stress evolution of the joint plane is similar to that of the tensile stress in the region near the same surface. The position of the peak value is close, the value of the peak point is larger, and the value of the peak value approaches to 0. 5 with the distance from the peak point. The contact compressive stress of different morphology has great difference in shear stress, and the contact compressive stress of the same morphology is similar to the shear stress law and the position of peak value is close. Contact compressive stress, shear stress at the peak point of its value is larger, with far away from the peak point of its value approaching to 0. The number of peak points of the stress curve decreases gradually during the whole shear process. The ratio of shear stress to contact compressive stress in the same shear test is the friction coefficient. The change of opening distance is that the curve rises sharply to the peak point, then decreases, and finally approaches the level. The contact area curves of different JRC joints are basically the same, and the contact area and shear displacement can be fitted to y=axb curves.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU45

【參考文獻】

相關(guān)期刊論文 前10條

1 黃飄;;不同粗糙度結(jié)構(gòu)面試件剪切試驗特性研究[J];建筑監(jiān)督檢測與造價;2015年03期

2 張建明;劉泉聲;唐志成;占婷;蔣亞龍;;考慮剪切變形歷史影響的節(jié)理峰值剪切強度準(zhǔn)則[J];山東大學(xué)學(xué)報(工學(xué)版);2015年05期

3 王剛;張學(xué)朋;蔣宇靜;張永政;;一種考慮剪切速率的粗糙結(jié)構(gòu)面剪切強度準(zhǔn)則[J];巖土工程學(xué)報;2015年08期

4 楊潔;榮冠;程龍;侯迪;王小江;;節(jié)理峰值抗剪強度試驗研究[J];巖石力學(xué)與工程學(xué)報;2015年05期

5 姚孟迪;榮冠;侯迪;尹鵬海;;節(jié)理三維形貌與抗剪強度相關(guān)性研究[J];水電能源科學(xué);2013年12期

6 劉博;李海波;劉亞群;夏祥;;循環(huán)荷載作用下節(jié)理凸起體概化破壞模型及剪切強度計算分析[J];巖石力學(xué)與工程學(xué)報;2013年S2期

7 夏才初;宋英龍;唐志成;宋英杰;;反復(fù)直剪試驗節(jié)理強度與粗糙度變化的研究[J];中南大學(xué)學(xué)報(自然科學(xué)版);2012年09期

8 曹秋菊;王金安;;斷裂巖石粗糙性與巖體抗剪強度和機理的實驗研究[J];中國礦業(yè);2012年05期

9 朱小明;李海波;劉博;鄒飛;莫振澤;宋全杰;牛磊;;含二階起伏體的模擬巖體節(jié)理試樣剪切特性試驗研究[J];巖土力學(xué);2012年02期

10 劉克輝;陸文;田加亨;李強;;巖體結(jié)構(gòu)面不同剪切方向的抗剪強度模擬試驗研究[J];礦業(yè)研究與開發(fā);2009年02期

相關(guān)碩士學(xué)位論文 前1條

1 孔祥輝;結(jié)構(gòu)面表面形態(tài)與力學(xué)性質(zhì)相關(guān)性研究[D];長江科學(xué)院;2008年

，

本文編號：2184746