本文選題：鐵路隧道 + 位移監(jiān)測　； 參考：《中國地質(zhì)大學(xué)（北京）》2014年碩士論文

【摘要】：隨著國民經(jīng)濟(jì)的飛速發(fā)展，我國加大了對(duì)公共基礎(chǔ)設(shè)施的建設(shè)，尤其在公路、鐵路等交通基礎(chǔ)設(shè)施方面。近幾年，建設(shè)隧道工程的地質(zhì)與環(huán)境條件更加復(fù)雜，設(shè)計(jì)與施工難度加大，國內(nèi)外很多學(xué)者和專家對(duì)鐵路隧道都做了大量的研究，通過理論分析、模型試驗(yàn)、現(xiàn)場測試、數(shù)值模擬等手段并取得了一些成果。但由于現(xiàn)有的隧道圍巖穩(wěn)定性判斷理論和方法尚不成熟，一般隧道的判定依據(jù)主要是圍巖位移速度的變化，而對(duì)于地質(zhì)條件、施工環(huán)境復(fù)雜的隧道，還是主要結(jié)合現(xiàn)場的監(jiān)控量測進(jìn)行判定。因此，，對(duì)鐵路隧道開挖變形和穩(wěn)定性研究成為當(dāng)今巖土工程中的一個(gè)重要課題。 本文以戚家埡隧道為背景，主要研究工作及取得的成果有： （1）總結(jié)了鐵路隧道圍巖變形監(jiān)控量測的手段及圍巖穩(wěn)定性評(píng)價(jià)方法，分析了圍巖破壞的影響因素。 （2）結(jié)合戚家埡隧道的地質(zhì)條件、地層巖性、水文地質(zhì)條件、不良地質(zhì)現(xiàn)象和現(xiàn)場施工方法及工藝，分析了該隧道圍巖的破壞機(jī)理和影響戚家埡隧道圍巖穩(wěn)定性的主要因素。 （3）對(duì)現(xiàn)場監(jiān)控量測數(shù)據(jù)（隧道典型斷面的拱頂下沉量及收斂位移量），選取最優(yōu)函數(shù)并對(duì)測點(diǎn)位移數(shù)據(jù)做回歸分析。繪制了位移-時(shí)間曲線圖，計(jì)算了圍巖的變形速率及變形量，分析了隧道圍巖的穩(wěn)定性，預(yù)測了圍巖的最終變形量，并確定了二次襯砌施作的最佳時(shí)間。 （4）選取戚家埡隧道Ⅲ、Ⅳ級(jí)圍巖典型斷面，分別對(duì)其襯砌結(jié)構(gòu)受力進(jìn)行了數(shù)值分析，得出了襯砌斷面的軸力、剪力及彎矩，并根據(jù)襯砌結(jié)構(gòu)的安全性系數(shù)評(píng)價(jià)了二次襯砌支護(hù)的穩(wěn)定性。 （5）基于理論計(jì)算和數(shù)值模擬方法評(píng)價(jià)了戚家埡隧道襯砌支護(hù)結(jié)構(gòu)的穩(wěn)定性。
[Abstract]:With the rapid development of national economy, China has increased the construction of public infrastructure, especially in the road, railway and other transportation infrastructure. In recent years, the geological and environmental conditions of tunnel construction project are more complicated, and the design and construction are more difficult. Many scholars and experts at home and abroad have done a lot of research on railway tunnel, through theoretical analysis, model test, field test, Some results have been obtained by means of numerical simulation and so on. However, the existing theories and methods for judging the stability of tunnel surrounding rock are still immature. Generally, the determination of tunnel is mainly based on the change of displacement velocity of surrounding rock, but for the tunnel with complicated geological conditions, the construction environment is complex. Or mainly combined with the monitoring and measurement of the site to determine. Therefore, the research on deformation and stability of railway tunnel excavation has become an important subject in geotechnical engineering. Taking Qijiaya tunnel as the background, the main research work and achievements are as follows: (1) the methods of monitoring and measuring the surrounding rock deformation of railway tunnel and the method of evaluating the stability of surrounding rock are summarized. The influencing factors of surrounding rock failure are analyzed. (2) combined with the geological conditions, stratigraphic lithology, hydrogeological conditions, bad geological phenomena, site construction methods and techniques of Qijiaya Tunnel, The failure mechanism of surrounding rock of the tunnel and the main factors affecting the stability of surrounding rock of Qijiaya tunnel are analyzed. (3) for the field monitoring data (the subsidence of the arch roof and the convergent displacement of the typical section of the tunnel), the optimal selection is made. Function and regression analysis of displacement data of measured points. The displacement-time curve is drawn, the deformation rate and deformation amount of surrounding rock are calculated, the stability of surrounding rock of tunnel is analyzed, and the final deformation quantity of surrounding rock is predicted. The optimum time of secondary lining construction is determined. (4) the typical sections of grade 鈪

本文編號(hào)：2106305