發(fā)布時(shí)間：2018-05-31 09:30

  本文選題：雪峰山 + 巖爆��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：在深埋長(zhǎng)大隧道中,巖爆是開挖過程中常遇到的工程地質(zhì)災(zāi)害,一般認(rèn)為巖爆是在高地應(yīng)力條件下,硬脆性圍巖因開挖卸荷導(dǎo)致洞壁圍巖應(yīng)力重新分布,巖體中貯存的彈性應(yīng)變能突然釋放的一種動(dòng)力失穩(wěn)現(xiàn)象。它嚴(yán)重威脅設(shè)備和施工人員的安全、影響工程的進(jìn)度,己成為世界性的工程難題。開展巖爆形成機(jī)理、預(yù)測(cè)和防治方法研究,有效遏制高強(qiáng)度巖爆災(zāi)害的發(fā)生,避免巖爆災(zāi)害造成的設(shè)備損失、人員傷亡、工期延誤,已成為我國(guó)廣大工程技術(shù)人員亟待解決的重大課題。 滬昆高鐵湖南段雪峰山隧道埋深大、線路長(zhǎng),有可能產(chǎn)生巖爆災(zāi)害,針對(duì)這一問題,本文用多種方法對(duì)隧道各段進(jìn)行了巖爆危險(xiǎn)性預(yù)測(cè),并重點(diǎn)分析了噴錨支護(hù)措施在防治巖爆方面的作用,并提出了雪峰山隧道巖爆分級(jí)綜合防治措施。本文主要做了如下工作： (1)研究了雪峰山隧道隧址區(qū)自然地理特征、地層巖性、地質(zhì)構(gòu)造、水文地質(zhì)特征和工程地質(zhì)特征。 (2)簡(jiǎn)要對(duì)開挖后隧道圍巖二次應(yīng)力場(chǎng)進(jìn)行了平面數(shù)值模擬,得到了隧道圍巖二次應(yīng)力場(chǎng)的分布特征。 (3)通過理論計(jì)算和數(shù)值模擬技術(shù),應(yīng)用應(yīng)力強(qiáng)度比法(單指標(biāo)),對(duì)隧道各段巖爆危險(xiǎn)性進(jìn)行了預(yù)測(cè)。同時(shí),又基于模糊物元理論對(duì)隧道典型洞段巖爆危險(xiǎn)性等級(jí)進(jìn)行評(píng)價(jià)。并對(duì)兩種預(yù)測(cè)方法進(jìn)行了對(duì)比,得出基于模糊物元理論的巖爆評(píng)價(jià)方法要優(yōu)于應(yīng)力強(qiáng)度比法等單指標(biāo)巖爆預(yù)測(cè)評(píng)價(jià)方法。 (4)使用有限差分軟件FLAC3D進(jìn)行數(shù)值模擬,分析噴錨支護(hù)措施在防治巖爆中的作用,得到了防治巖爆效果最好的錨桿間距和錨桿長(zhǎng)度。同時(shí),綜合國(guó)內(nèi)外巖爆防治實(shí)踐,根據(jù)雪峰山隧道實(shí)際情況,提出了雪峰山巖爆分級(jí)綜合防治措施。 本文針對(duì)雪峰山隧道巖爆問題,提出的預(yù)測(cè)方法和防治措施,對(duì)國(guó)內(nèi)外同類工程具有一定的借鑒和參考價(jià)值。
[Abstract]:In the deep buried long tunnel, rock burst is a common engineering geological disaster in the excavation process. It is generally considered that under the condition of high ground stress, the stress distribution of the wall rock of the hard brittle rock is redistributed due to excavation unloading. A dynamic instability phenomenon caused by the sudden release of elastic strain energy stored in rock mass. It is a serious threat to the safety of equipment and construction personnel, affecting the progress of the project, has become a worldwide engineering problem. To study the formation mechanism, prediction and prevention methods of rock burst, effectively contain the occurrence of high intensity rock burst disaster, avoid equipment loss, casualties and delay in construction period caused by rock burst disaster, It has become an important subject to be solved urgently by the vast number of engineers and technicians in our country. The Xuefengshan tunnel in Hunan section of Shanghai-Kunming high-speed railway has a large buried depth and long line, which may lead to rockburst disaster. In view of this problem, this paper uses various methods to predict the risk of rockburst in each section of the tunnel. The function of shotcrete anchor support in preventing rockburst is analyzed, and the comprehensive prevention measures of rockburst classification in Xuefengshan Tunnel are put forward. The main work of this paper is as follows: 1) the physical geography, stratigraphic lithology, geological structure, hydrogeological characteristics and engineering geological characteristics of Xuefengshan Tunnel site are studied. 2) the plane numerical simulation of secondary stress field of tunnel surrounding rock after excavation is carried out, and the distribution characteristics of secondary stress field of tunnel surrounding rock are obtained. Through theoretical calculation and numerical simulation, the risk of rock burst in each section of tunnel is predicted by using the method of stress intensity ratio (single index). At the same time, based on fuzzy matter-element theory, the grade of rock burst hazard in typical tunnel section is evaluated. By comparing the two prediction methods, it is concluded that the evaluation method based on fuzzy matter-element theory is superior to the single index rock-burst prediction method such as the stress intensity ratio method. In this paper, finite difference software FLAC3D is used to simulate and analyze the effect of shotcreting and anchor support on preventing rock burst, and the best bolt spacing and bolt length are obtained. At the same time, according to the actual situation of Xuefeng Mountain Tunnel, the comprehensive prevention measures of rock burst classification in Xuefeng Mountain are put forward according to the practice of rock burst prevention and control at home and abroad. Aiming at the problem of rock burst in Xuefengshan tunnel, the prediction methods and prevention measures are put forward in this paper, which can be used for reference and reference for similar projects at home and abroad.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U457

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本文編號(hào)：1959150