發(fā)布時(shí)間：2018-11-05 19:49

【摘要】：隧道圍巖穩(wěn)定性一直以來都是隧道開挖過程中備受關(guān)注的問題,隧道在開挖過程中會(huì)經(jīng)常遇到各種復(fù)雜多變的不良地質(zhì)現(xiàn)象,斷層就是最常見的一種不良地質(zhì)現(xiàn)象。隧道開挖地段如果有斷層破碎區(qū)段,隧道圍巖就會(huì)很不穩(wěn)定,所以做好斷層破碎區(qū)域隧道圍巖穩(wěn)定性的分析對減少各類地質(zhì)災(zāi)害,提高隧道高效開挖和安全支護(hù)有十分可觀的現(xiàn)實(shí)意義。斷層的存在破壞了巖層的連續(xù)性與完整性,使得斷層附近圍巖的應(yīng)力分布差異性很大。在隧道開挖過程中斷層附近的位移場、應(yīng)力場、拱頂位移及最大不平衡力都將發(fā)生變化,對于這種在特殊地質(zhì)條件下的隧道開挖,目前還無法得到圍巖應(yīng)力與位移的具體解析解。隨著計(jì)算機(jī)技術(shù)的不斷發(fā)展,數(shù)值計(jì)算方法也在不斷地更新與進(jìn)步,對于復(fù)雜的工程問題借助計(jì)算機(jī)利用數(shù)值計(jì)方法可以得到滿足工程要求的數(shù)值解析,由此出現(xiàn)了各種數(shù)值模擬軟件,成為研究巖體力學(xué)的重要手段。如果模型建立得當(dāng),初始條件和邊界條件選擇恰當(dāng)合理的條件下,利用數(shù)值模擬分析計(jì)算得到的數(shù)據(jù)完全可以作為一種參考。論文前半部分依次對斷層區(qū)域隧道圍巖穩(wěn)定性的研究現(xiàn)狀、斷層的工程特性、斷層區(qū)域圍巖穩(wěn)定性做了定量的研究,應(yīng)用彈性力學(xué)理論知識(shí)對斷層區(qū)域隧道圍巖進(jìn)行受力分析,推導(dǎo)并總結(jié)出隧道開挖后圍巖應(yīng)力與位移表達(dá)式。后半部分通過利用FLAC—3D數(shù)值模擬的方法,以新七道梁隧道為背景,模擬了斷層區(qū)域隧道開挖與襯砌后應(yīng)力、位移分布情況。以上研究對地下工程隧道圍巖穩(wěn)定性分析有一定的參考價(jià)值。
[Abstract]:The stability of tunnel surrounding rock has always been a problem of great concern in the excavation process of tunnel. During the excavation of tunnel, various complicated and changeable bad geological phenomena are often encountered, and fault is the most common bad geological phenomenon. If there is fault breaking section in tunnel excavation area, the surrounding rock of tunnel will be unstable, so the stability analysis of tunnel surrounding rock in fault broken area can reduce all kinds of geological hazards. It is of great practical significance to improve the high-efficiency excavation and safety support of the tunnel. The existence of faults destroys the continuity and integrity of rock strata and makes the stress distribution of surrounding rock near the fault very different. During tunnel excavation, the displacement field, stress field, arch displacement and maximum unbalance force will all change. At present, it is impossible to obtain the concrete analytical solution of surrounding rock stress and displacement. With the continuous development of computer technology, numerical calculation methods are constantly updated and improved. For complex engineering problems, numerical analysis can be obtained to meet the requirements of engineering with the help of computer. As a result, various numerical simulation software have emerged, and become an important means of studying rock mechanics. If the model is properly established and the initial and boundary conditions are properly selected, the data obtained by numerical simulation analysis can be used as a reference. In the first half of this paper, the research status of surrounding rock stability, the engineering characteristics of fault and the stability of surrounding rock in fault region are studied in turn, and the mechanical analysis of surrounding rock in fault region is carried out by using the theory of elastic mechanics. The expressions of surrounding rock stress and displacement after tunnel excavation are deduced and summarized. In the latter part, the stress and displacement distribution of tunnel excavation and lining in fault area is simulated by using the FLAC-3D numerical simulation method and taking the new Qidaoliang tunnel as the background. The above research has certain reference value to the underground engineering tunnel surrounding rock stability analysis.
【學(xué)位授予單位】：蘭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U451.2

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