本文關(guān)鍵詞： 凍結(jié) 巖石節(jié)理面 張開(kāi)度 粗糙度 冰的粘附強(qiáng)度 破壞形式 峰值抗剪強(qiáng)度　出處：《吉林大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著國(guó)家西部大開(kāi)發(fā)戰(zhàn)略及振興東北老工業(yè)基地戰(zhàn)略的實(shí)施,在多年凍土區(qū)及季節(jié)凍土區(qū)修建的隧道工程數(shù)量越來(lái)越多。這些隧道工程中,有超過(guò)70%出現(xiàn)了不同程度的拱頂漏水掛冰、路面鼓脹積冰、襯砌開(kāi)裂、洞口邊坡支擋結(jié)構(gòu)凍脹開(kāi)裂等凍害,威脅隧道圍巖及洞口邊坡的穩(wěn)定性。通過(guò)調(diào)查發(fā)現(xiàn),多年凍土區(qū)隧道襯砌凍害產(chǎn)生部位多為圍巖節(jié)理較為發(fā)育的地段;同時(shí),洞口邊坡支擋結(jié)構(gòu)凍害也多發(fā)生在含有控制性結(jié)構(gòu)面的節(jié)理巖體邊坡地質(zhì)條件下。由此可見(jiàn),凍結(jié)條件下巖石節(jié)理面的剪切力學(xué)特性差異是造成多年凍土區(qū)隧道及洞口邊坡凍害的根本原因。本文以青海省G214國(guó)道姜路嶺路段的凝灰?guī)r節(jié)理作為研究對(duì)象,選取4組不同粗糙程度的巖石節(jié)理面進(jìn)行研究,得出了不同法向應(yīng)力和張開(kāi)度條件下的凍結(jié)巖石節(jié)理面峰值剪切強(qiáng)度,總結(jié)和分析法向應(yīng)力和張開(kāi)度與峰值剪切強(qiáng)度的變化規(guī)律,并分析了粗糙度對(duì)剪切強(qiáng)度的影響。通過(guò)觀(guān)察試件的破壞形式,從力學(xué)角度和冰的粘附強(qiáng)度理論角度兩方面對(duì)其破壞機(jī)理進(jìn)行了分析,最后提出了凍結(jié)巖石節(jié)理面峰值抗剪強(qiáng)度準(zhǔn)則。本文主要取得的研究成果如下:(1)根據(jù)不同法向應(yīng)力條件下剪切試驗(yàn)得到的剪切應(yīng)力——剪切位移曲線(xiàn),一般情況整個(gè)試驗(yàn)過(guò)程分成了4個(gè)階段,分別為:瞬時(shí)變形階段、應(yīng)力持續(xù)增加階段、屈服階段和殘余剪切階段。(2)得出了凍結(jié)巖石節(jié)理面的峰值剪切強(qiáng)度隨著張開(kāi)度的增大而降低,兩者成負(fù)相關(guān)的關(guān)系,達(dá)到峰值剪切強(qiáng)度時(shí)的剪切位移與張開(kāi)度也成負(fù)相關(guān)關(guān)系。(3)分析了節(jié)理表面形貌對(duì)凍結(jié)巖石節(jié)理面的峰值剪切強(qiáng)度的影響,在本文研究的張開(kāi)度條件下得出了巖石節(jié)理面粗糙度越大其峰值剪切強(qiáng)度越小。(4)通過(guò)對(duì)試驗(yàn)破壞后的試件觀(guān)察,發(fā)現(xiàn)試件在不同張開(kāi)度條件下節(jié)理面的破壞形式區(qū)別很大。由此,從力學(xué)角度和冰的粘附強(qiáng)度理論角度兩方面對(duì)整個(gè)試驗(yàn)的破壞機(jī)理進(jìn)行分析,根據(jù)試件破壞形式不同,得出了3種破壞形式,分別為:冰層脫離破壞、冰層剪斷破壞和冰巖剪斷破壞。(5)通過(guò)剪切試驗(yàn)得到的峰值剪切強(qiáng)度值,根據(jù)試驗(yàn)結(jié)束后試件的破壞形式,得出不同張開(kāi)度條件下的峰值抗剪強(qiáng)度準(zhǔn)則。
[Abstract]:With the implementation of the strategy of developing western China and revitalizing the old industrial base in Northeast China, more and more tunnel projects have been built in permafrost regions and seasonal frozen regions. There are more than 70% cases of frost damage, such as different degree of water leakage and ice hanging, bulging and ice accumulation, lining cracking, frost heaving cracking of retaining structure of the slope at the entrance of the tunnel, and so on. Through the investigation, it is found that the site of tunnel lining frost damage in permafrost region is the section where the joint of surrounding rock is relatively developed. At the same time, the freezing damage of the retaining structure of the slope at the mouth of the tunnel also occurs mostly under the geological conditions of the jointed rock slope containing the control structure surface, so it can be seen. The difference of shear mechanical properties of rock joints under freezing condition is the fundamental cause of freezing damage of tunnel and portal slope in frozen soil region for many years. The tuff joint of G214 National Highway in Qinghai Province is studied in this paper. Elephant. The peak shear strength of frozen rock joints under different normal stress and opening degree is obtained by selecting four groups of rock joints with different roughness. The influence of roughness on shear strength is analyzed by summarizing and analyzing the variation law of directional stress, opening degree and peak shear strength, and the failure mode of specimen is observed. In this paper, the failure mechanism of ice is analyzed from the point of view of mechanics and the theory of ice adhesion strength. Finally, the criterion of peak shear strength of frozen rock joints is proposed. The main research results in this paper are as follows: 1) the shear stress-shear displacement curves obtained by shear tests under different normal stress conditions. In general, the whole test process is divided into four stages, namely, the instantaneous deformation stage and the stress increasing stage. It is concluded that the peak shear strength of frozen rock joints decreases with the increase of opening degree, and there is a negative correlation between them. The effect of the surface morphology of joints on the peak shear strength of frozen rock joints was analyzed. Under the condition of opening degree studied in this paper, it is concluded that the greater the roughness of rock joint surface is, the smaller the peak shear strength is. It is found that the failure modes of the joints are very different under different opening conditions. Therefore, the failure mechanism of the whole test is analyzed from the angle of mechanics and the theory of the adhesion strength of ice. According to the different failure forms of the specimens, three kinds of failure forms are obtained, which are: ice sheet breakaway, ice shear failure and ice rock shear failure. 5) the peak shear strength obtained by shear test. According to the failure form of the specimen after the test, the criterion of peak shear strength under different opening degree is obtained.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U451.2

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