本文關(guān)鍵詞：基于壓縮試驗與DIC的巖石脆性破壞特征與應(yīng)用研究　出處：《寧夏大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 硬巖 脆性破壞 壓縮試驗 數(shù)字圖像相關(guān)方法 防控

【摘要】：隨著地下巖體工程埋深的不斷增加,深部巖體“三高一擾動”的(高地應(yīng)力、高滲透地壓、高地溫以及強烈開采擾動)惡劣環(huán)境導(dǎo)致開采時出現(xiàn)冒頂、片幫等現(xiàn)象明顯增多,甚至出現(xiàn)巖爆等動力地壓災(zāi)害。巖石的脆性破壞問題給工人的生命安全和施工設(shè)備、巖體工程的穩(wěn)定性等造成極大的威脅,因此許多巖石力學(xué)專家對巖石的脆性破壞開展系統(tǒng)的研究。巖石力學(xué)試驗是對巖石力學(xué)性質(zhì)研究的最基本也是最主要的手段,國內(nèi)外巖石力學(xué)工作者通過室內(nèi)試驗對不同巖石在單、三軸條件下的力學(xué)性質(zhì)、破壞特點等開展了廣泛的研究,并借助各種先進(jìn)的監(jiān)測手段了解巖石內(nèi)部的損傷破壞過程。本文針對巖體工程中頻繁發(fā)生的脆性破壞現(xiàn)象,為研究不同防治措施對其防治效果,展開以下工作：(1)對不同巖石開展單、三軸壓縮試驗,同時為了對比,也對類巖石材料(砂漿、石膏等)進(jìn)行壓縮試驗,研究不同試驗條件下巖石的力學(xué)特性,尤其峰后力學(xué)行為的變化特點,從宏觀上(不同巖石破壞過程的現(xiàn)象如聲響、彈射和應(yīng)力應(yīng)變曲線特征)揭示不同巖石的脆性破壞特點和影響因素；(2)根據(jù)巖石脆性破壞的評價方法,定量分析不同試驗條件如圍壓、試樣含水率等對巖石脆性破壞強度的影響：(3)借助數(shù)字圖像相關(guān)方法(DIC)對不同強度的巖石在變形破壞全過程的位移、應(yīng)變場與破壞特征的關(guān)系進(jìn)行了分析,并為巖石脆性破壞的監(jiān)測和預(yù)警提供了一定的理論依據(jù)；(4)基于試驗結(jié)果探討不同的措施對巖石脆性破壞的防治效果,通過評估和討論,得到了注水軟化圍巖法、加強支護法和鉆孔卸壓法的適用條件。
[Abstract]:With the increasing of buried depth of underground rock mass engineering, the bad environment of "three high and one disturbance" (high ground stress, high permeability ground pressure, high ground temperature and strong mining disturbance) in deep rock mass results in roof fall. The phenomena such as flaps increase obviously, even the dynamic ground pressure disasters such as rockburst occur. The brittle failure of rock causes great threat to the safety of workers' life and construction equipment, the stability of rock mass engineering, and so on. Therefore, many rock mechanics experts have carried out systematic research on brittle failure of rock. Rock mechanics test is the most basic and main means to study rock mechanical properties. Through laboratory tests, domestic and foreign rock mechanics workers have carried out extensive research on the mechanical properties and failure characteristics of different rocks under uniaxial and triaxial conditions. And with the help of various advanced monitoring means to understand the damage and failure process of rock. This paper aims at the phenomenon of brittle failure frequently occurring in rock mass engineering, in order to study the prevention and cure effect of different prevention measures. The following work is carried out: (1) uniaxial and triaxial compression tests on different rocks, and compression tests on rock-like materials (mortar, gypsum, etc.) for comparison. This paper studies the mechanical properties of rock under different test conditions, especially the changing characteristics of post-peak mechanical behavior, from the macroscopic point of view (the phenomena of different rock failure processes such as sound). The characteristics of ejection and stress-strain curves reveal the brittle failure characteristics and influencing factors of different rocks. 2) according to the evaluation method of brittle failure of rock, quantitative analysis of different test conditions such as confining pressure. The influence of moisture content on the brittle failure strength of rock the displacement of rock with different strength in the whole process of deformation and failure is studied by means of digital image correlation method (DICs). The relationship between strain field and failure characteristics is analyzed, which provides a theoretical basis for monitoring and early warning of brittle failure of rock. Based on the test results, the effects of different measures on the prevention and treatment of rock brittleness failure are discussed. Through evaluation and discussion, the applicable conditions of water injection softening surrounding rock method, strengthening support method and borehole pressure relief method are obtained.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TD313

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6 h侗臼ひ，

本文編號：1417562