本文選題：巖石力學(xué) + 共面斷續(xù)裂隙巖體　； 參考：《重慶大學(xué)》2015年碩士論文

【摘要】：由于巖體所賦存環(huán)境和荷載作用的復(fù)雜性,導(dǎo)致工程建設(shè)及后期使用過程中出現(xiàn)了各種變形和失穩(wěn)破壞問題。長期荷載作用下巖體變形及損傷演化為巖體工程長期穩(wěn)定性及安全性評價的重要巖石力學(xué)問題。本論文依托導(dǎo)師國家自然科學(xué)基金面上項目(No.41172243):高殘余應(yīng)力下卸荷破裂硬巖的流變特性及時效擴展機理,開展了含共面斷續(xù)裂隙巖樣單軸壓縮、單軸壓縮蠕變及單軸循環(huán)荷載流變試驗研究。較詳細(xì)的闡述了共面斷續(xù)裂隙特征、應(yīng)力水平及循環(huán)荷載周期對于巖樣單軸壓縮流變特性的影響。研究成果對于巖石工程長期穩(wěn)定性評價有一定的應(yīng)用意義。主要工作如下:①基于常規(guī)單軸壓縮試驗,分析了完整及含不同傾角的共面斷續(xù)裂隙巖石的變形及強度參數(shù)特征,總結(jié)了完整及含不同傾角的共面裂隙巖樣變形與破壞異同,進(jìn)而歸納了含預(yù)制共面斷續(xù)裂隙砂巖樣宏觀破壞模式。②基于單軸壓縮蠕變試驗,闡述了蠕變應(yīng)力水平,共面斷續(xù)裂隙對蠕變形、損傷破壞的影響特征。研究表明完整及裂隙巖樣衰減蠕變時間均隨應(yīng)力水平的增加而減少,裂隙巖樣蠕變速率及變形量均高于完整巖樣。③基于單軸循環(huán)荷載蠕變試驗,較詳細(xì)分析了巖樣變形破壞、蠕變曲線、應(yīng)力-應(yīng)變曲線及其滯回特性特征。試驗表明循環(huán)蠕變荷載作用下,巖樣經(jīng)歷了微裂隙壓密閉合、彈性穩(wěn)定至損傷變形過程,且循環(huán)加卸載過程中存在較明顯的滯彈性特性。探討了應(yīng)力水平下限及加載周期對循環(huán)荷載蠕變特性的影響,分析結(jié)果表明循環(huán)蠕變荷載作用下降低應(yīng)力水平下限及延長試驗周期均會引起巖樣變形的增加。④以含35o預(yù)制共面裂隙流變加載試驗為基礎(chǔ),對恒載蠕變及循環(huán)荷載蠕變兩種流變加載方式下的巖樣應(yīng)變量及應(yīng)變率變化進(jìn)行了詳細(xì)對比。發(fā)現(xiàn)隨在相當(dāng)?shù)纳舷迲?yīng)力作用時間內(nèi),循環(huán)蠕變巖樣變形增量均大于恒載蠕變巖樣,表明卸載及下限應(yīng)力保載過程中巖樣也存在較強損傷。
[Abstract]:Due to the complexity of the environment and loading of rock mass, various deformation and instability problems have occurred in the process of engineering construction and later use. The deformation and damage evolution of rock mass under long-term load is an important rock mechanics problem for the long-term stability and safety evaluation of rock mass engineering. The Science Foundation Project (No.41172243): the rheological characteristics and aging mechanism of the hard rock under high residual stress unloading and fracture hard rock, the rheological tests of uniaxial compression, uniaxial compression creep and uniaxial cyclic loading are carried out. The characteristics of coplanar intermittent fracture, stress level and cyclic loading period are described in detail. The research results have some practical significance for the long-term stability evaluation of rock engineering. The main work is as follows: 1. Based on the conventional uniaxial compression test, the characteristics of the deformation and strength parameters of the coplanar fractured rock with complete and different dip angles are analyzed, and the complete and different dip angles are summarized. According to the similarities and differences between the deformation and failure of the coplanar fissure rock sample, the macroscopic failure mode of the prefabricated coplanar fractured sand rock sample is summed up. Secondly, based on the uniaxial compression creep test, the creep stress level and the effect of the coplanar intermittent fracture on the creep deformation and damage damage are expounded. The study shows that the decay and creep time of the complete and fractured rock samples are all with the stress. The creep rate and deformation of the fractured rock samples are all higher than that of the intact rock. Thirdly, based on the uniaxial cyclic loading creep test, the deformation failure, the creep curve, the stress-strain curve and its hysteresis characteristics are analyzed in detail. The test shows that the rock sample has experienced the close closure of the micro crack under the cyclic creep load. The effect of the lower limit of stress level and the loading period on the creep characteristics of cyclic loading is discussed. The results show that the decrease of the lower stress level and the extension of the test period will cause the increase of the deformation of the sample. On the basis of the rheological loading test of 35o prefabricated coplanar crevice, the variation of strain rate and strain rate of rock samples under two kinds of rheological loading methods, constant load creep and cyclic loading creep, are compared in detail. It is found that the deformation increment of cyclic creep specimen is larger than that of constant load creep in the time of equal upper limit stress. There are strong damage to rock samples in the lower limit stress protection process.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU45

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