本文選題：充填節(jié)理　切入點(diǎn)：常法向剛度條件　出處：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：對(duì)于地下工程巖體,節(jié)理在剪切過(guò)程中會(huì)因剪脹效應(yīng)而受到周?chē)鷰r體的約束作用,使節(jié)理面的法向應(yīng)力增加,這反過(guò)來(lái)將抑制節(jié)理的剪脹效應(yīng),因此節(jié)理的剪切過(guò)程應(yīng)視為在常法向剛度條件下進(jìn)行。若節(jié)理被軟弱巖土材料所充填,則充填節(jié)理往往成為巖體最容易發(fā)生剪切滑移的位置,這將顯著弱化節(jié)理巖體的抗剪強(qiáng)度。因此研究充填節(jié)理在常法向剛度條件下的剪切破壞特征對(duì)地下工程巖體穩(wěn)定性的評(píng)價(jià)及控制有重要的理論意義。本文首先考慮了影響充填節(jié)理直剪試驗(yàn)的幾個(gè)關(guān)鍵因素,在此基礎(chǔ)之上用數(shù)值模擬方法實(shí)現(xiàn)了充填節(jié)理在常法向剛度條件下的直剪試驗(yàn)。通過(guò)設(shè)置數(shù)值對(duì)比試驗(yàn),分析了常法向剛度和常法向應(yīng)力條件下節(jié)理剪切力學(xué)行為的異同,并對(duì)比了充填節(jié)理和非充填節(jié)理在常法向剛度條件下的剪切破壞特征,結(jié)果表明充填節(jié)理的剪切破壞模式是由巖石、充填物和兩者接觸面的力學(xué)屬性共同控制的,充填物的存在不僅降低了節(jié)理的剪切強(qiáng)度,同時(shí)還改變了節(jié)理的剪切破壞模式。通過(guò)數(shù)值模擬試驗(yàn)還研究了節(jié)理起伏度和充填度對(duì)充填節(jié)理剪切強(qiáng)度的影響,結(jié)果表明節(jié)理起伏度的增加能夠提高充填節(jié)理的抗剪強(qiáng)度,而充填度的增加則會(huì)顯著降低充填節(jié)理的抗剪強(qiáng)度,但當(dāng)充填度大于1.0后充填節(jié)理抗剪強(qiáng)度主要由充填物的力學(xué)屬性控制,此時(shí)其抗剪強(qiáng)度隨充填度的變化很小。本文運(yùn)用FLAC3D中樁單元的錨桿支護(hù)功能,模擬研究了錨桿對(duì)充填節(jié)理剪切強(qiáng)度的強(qiáng)化作用,并分析了節(jié)理充填度和錨桿安裝角度對(duì)加錨充填節(jié)理剪切強(qiáng)度的影響,結(jié)果表明錨桿在剪切過(guò)程中為充填節(jié)理提供了額外粘聚力和額外法向力,使加錨充填節(jié)理的抗剪強(qiáng)度高于充填節(jié)理的抗剪強(qiáng)度,且當(dāng)錨桿安裝角度與試塊滑移角度相差較小時(shí),錨桿的抗剪性能能夠得到充分發(fā)揮。在上述研究基礎(chǔ)之上,本文采用數(shù)值模擬方法分析了含充填節(jié)理巷道圍巖的變形破壞特征,并確定了節(jié)理充填度及其分布層位對(duì)巷道圍巖穩(wěn)定性的影響,根據(jù)所得到的規(guī)律提出了相應(yīng)的巷道圍巖控制技術(shù)。現(xiàn)場(chǎng)礦壓觀測(cè)結(jié)果表明,該控制技術(shù)能夠保證巷道圍巖的穩(wěn)定性。
[Abstract]:For the underground engineering rock mass, joint and is restrained by the surrounding rock by the dilatancy effect in the shearing process, and the envoys of the normal stress increase, which in turn will inhibit the dilatancy effect of joints, so the shear process of joints should be regarded as in stiffness conditions in the ordinary law. If the joint is the soft rock soil material filling, packing joints often become the rock most prone to shear slip position, this will be a significant weakening of the shear strength of jointed rock mass. So the study of filling joints in constant normal shear stiffness under the condition of damage evaluation and control characteristics on the stability of underground engineering rock mass has important theoretical significance. We first consider several key factors influencing the filling joint shear test, on the basis of numerical implementation of filling joint stiffness to shear test under the condition of direct simulation method in the ordinary law. By setting the value of the Ratio test, analysis of constant normal stiffness and constant normal shear mechanical behavior of joints should be between force conditions, and compared the filling joints and unfilled failure characteristics to shear stiffness under the condition of regular method, results show that the shear failure mode by filling jointed rock, filling and two the contact surface of the mechanical properties of joint control, filling the existence not only reduces the shear strength of joints, but also changed the joint shear failure mode. Also study the joints and filling degree of filling joint shear strength through numerical simulation. The results show that the increase of the joints can improve the shear strength of filling the joint, and increase the filling degree will significantly reduce the shear strength of joint filling, but when the filling degree is more than 1 after filling the joint shear strength is mainly controlled by the mechanical property of filling material, the anti Shear strength change with filling degree is very small. This paper uses FLAC3D pile elements in bolt supporting function, simulation of the strengthening effect of bolt on filling the shear strength of joints, and analyzes the influence of installation joint filling degree and anchor angle of anchor and filling the shear strength of joints, the results show that the bolt in the shearing process for joint filling provides additional cohesion and additional normal stress, the shear strength of the joints is higher than the filling of anchored joint filling, and when the bolt mounting angle and block slip angle difference is small, the shear performance of bolt can be brought into full play. Based on the above research, this paper analyzes the the deformation characteristics of surrounding rock with filling jointed rock tunnel numerical simulation method, and determine the joint filling degree and its distribution layer effect on the stability of surrounding rock, according to the law and put forward the corresponding The field rock pressure observation results show that the control technology can guarantee the stability of the surrounding rock of the roadway.

【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD353

【參考文獻(xiàn)】

中國(guó)期刊全文數(shù)據(jù)庫(kù) 前6條

1 王中文;方建勤;;巖體結(jié)構(gòu)面錨固剪切特性的數(shù)值分析[J];煤炭學(xué)報(bào);2010年05期

2 康紅普;司林坡;蘇波;;煤巖體鉆孔結(jié)構(gòu)觀測(cè)方法及應(yīng)用[J];煤炭學(xué)報(bào);2010年12期

3 黃國(guó)明,黃潤(rùn)秋;巖體節(jié)理表面幾何特性描述[J];水文地質(zhì)工程地質(zhì);1999年05期

4 葛修潤(rùn),劉建武;加錨節(jié)理面抗剪性能研究[J];巖土工程學(xué)報(bào);1988年01期

5 張偉;劉泉聲;;節(jié)理巖體錨桿的綜合變形分析[J];巖土力學(xué);2012年04期

6 宋英龍;夏才初;唐志成;宋英杰;;不同接觸狀態(tài)下粗糙節(jié)理剪切強(qiáng)度性質(zhì)的顆粒流數(shù)值模擬和試驗(yàn)驗(yàn)證[J];巖石力學(xué)與工程學(xué)報(bào);2013年10期

中國(guó)博士學(xué)位論文全文數(shù)據(jù)庫(kù) 前1條

1 楊為民;錨桿對(duì)斷續(xù)節(jié)理巖體的加固作用機(jī)理及應(yīng)用研究[D];山東大學(xué);2009年

，

本文編號(hào)：1639043