本文選題：深層隧道 + 主承載結(jié)構(gòu)��； 參考：《湖南大學(xué)》2014年碩士論文

【摘要】：地層在開挖后，，形成了一個釋放應(yīng)力，此時圍巖承擔(dān)二次釋放應(yīng)力，是主承載結(jié)構(gòu)。支護加強圍巖強度或者承擔(dān)一部分二次釋放應(yīng)力，是輔承載結(jié)構(gòu)。各種圍巖分級方法僅給出圍巖承載能力的定性描述，缺乏定量描述，本文結(jié)合強度折減法，結(jié)合每次折減系數(shù)下的應(yīng)力響應(yīng)狀態(tài)提出等效強度的概念，實現(xiàn)了圍巖承載能力的定量化。本文提出了各支護手段的力學(xué)機理，以及對等效強度的貢獻大小，從而將主承載結(jié)構(gòu)與輔承載結(jié)構(gòu)的承載能力進行了具體的計算。最后本文對提高圍巖承載能力的各支護方案的承載效果進行了定量分析。 (1)圍巖支護結(jié)構(gòu)的計算理論主要經(jīng)過了剛性結(jié)構(gòu)階段、彈性結(jié)構(gòu)階段、連續(xù)介質(zhì)階段等發(fā)展歷程，人們對圍巖力學(xué)作用的認(rèn)識也經(jīng)歷了圍巖僅為荷載來源到圍巖本身也是承載結(jié)構(gòu)的轉(zhuǎn)變。在圍巖的支護設(shè)計方法上，傳統(tǒng)的支護設(shè)計方法主要是結(jié)構(gòu)力學(xué)設(shè)計方法，現(xiàn)代的設(shè)計方法則強調(diào)提高巖體強度以發(fā)揮圍巖本身的承載能力。 (2)現(xiàn)代支護結(jié)構(gòu)設(shè)計原理與方法以新奧法為代表，然而新奧法仍是以圍巖分級為基礎(chǔ)的經(jīng)驗設(shè)計，對于輔承載結(jié)構(gòu)對主承載結(jié)構(gòu)承載能力輔助作用的多少和主次沒有給出說明，本文不僅從各輔承載結(jié)構(gòu)的力學(xué)機理而且從承載能力定量化上給出具體的計算和說明，并給出了不同輔承載結(jié)構(gòu)承載能力的大小和主次。 (3)依據(jù)等效強度的概念，分析了不同支護結(jié)構(gòu)類型對圍巖承載能力提高幅度的影響，本文認(rèn)為，錨桿支護雖然對位移收斂效果不顯著，但是極大地提高了圍巖的承載能力，鋼拱架支護雖然對位移收斂有效果，但是對等效強度的提高效果不顯著，建議支護手段以錨桿支護為主。等效強度概念的提出定量地描述了圍巖及支護的承載能力，也為支護設(shè)計提供了理論上的依據(jù)。
[Abstract]:After excavation, a release stress is formed, and the surrounding rock bears the secondary release stress, which is the main bearing structure. Supporting strengthening the strength of surrounding rock or bearing part of secondary release stress is auxiliary bearing structure. All kinds of classification methods only give the qualitative description of the bearing capacity of surrounding rock, but lack of quantitative description. In this paper, combined with the strength reduction method and the stress response state under each reduction coefficient, the concept of equivalent strength is put forward. The quantitative analysis of the bearing capacity of surrounding rock is realized. In this paper, the mechanical mechanism of each supporting method and its contribution to the equivalent strength are put forward, so the bearing capacity of the main bearing structure and the auxiliary bearing structure are calculated concretely. Finally, the paper makes a quantitative analysis on the bearing effect of various supporting schemes to improve the bearing capacity of surrounding rock. 1) the calculation theory of surrounding rock supporting structure mainly goes through rigid structure stage and elastic structure stage. During the development of continuous medium stage, people's understanding of the mechanical function of surrounding rock has also experienced the transformation from the source of the surrounding rock to the bearing structure of the surrounding rock itself. In support design method of surrounding rock, the traditional support design method is mainly structural mechanics design method. The modern design method emphasizes the enhancement of rock mass strength in order to give full play to the bearing capacity of surrounding rock itself. (2) the design principle and method of modern supporting structure is represented by the New Austrian method, but the new Austrian method is still an empirical design based on the classification of surrounding rock. In this paper, not only from the mechanical mechanism of each auxiliary bearing structure, but also from the quantitative analysis of the bearing capacity of the auxiliary bearing structure, the concrete calculation and explanation are given. According to the concept of equivalent strength, the influence of different types of supporting structure on the increase of surrounding rock bearing capacity is analyzed. Although the effect of bolt support on displacement convergence is not significant, the bearing capacity of surrounding rock is greatly improved. Although steel arch support has effect on displacement convergence, the effect of improving equivalent strength is not significant. It is suggested that bolt support should be the main support method. The concept of equivalent strength describes quantitatively the bearing capacity of surrounding rock and support, and provides a theoretical basis for the design of support.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451.2

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