本文選題：數(shù)值模擬 + 高水壓��； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：改革開放以來，為了適應(yīng)當(dāng)代社會(huì)的高速發(fā)展，修建了很多隧道工程。而在修建隧道的過程中，出現(xiàn)了很多問題。其中隧道掌子面塌方是隧道工程最常見的問題之一。隧道掌子面塌方的因素包括地質(zhì)水文因素、施工因素、設(shè)計(jì)因素及認(rèn)識(shí)與管理因素。本文主要研究的問題研究水壓力對(duì)隧道掌子面穩(wěn)定性的影響，從而提出相關(guān)的施工防治措施。 針對(duì)這一問題，提出了通過有限差分軟件FLAC3D來模擬隧道開挖時(shí)，水壓力是如何影響隧道掌子面穩(wěn)定性的。而本文主要研究的內(nèi)容如下： ①不同圍巖等級(jí)的公路隧道在高水壓作用下掌子面附近圍巖的力學(xué)行為及穩(wěn)定情況分析、評(píng)價(jià)； ②研究在高水壓作用下，不同圍巖等級(jí)的公路隧道掌子面失去穩(wěn)定性的臨界作用值； ③不同尺寸斷面的公路隧道在高水壓作用下掌子面附近圍巖的力學(xué)行為及穩(wěn)定情況分析、評(píng)價(jià)； ④研究在高水壓作用下，不同尺寸斷面的公路隧道掌子面失去穩(wěn)定性的臨界作用值； ⑤在大于掌子面失去穩(wěn)定性的水壓力臨界作用值時(shí)，采用何種施工方案；在小于掌子面失去穩(wěn)定性的水壓力臨界作用值時(shí)，采用何種施工方案。 經(jīng)過FLAC3D軟件數(shù)值模擬后，得出了中等斷面、大斷面、特大斷面三種隧道斷面形式下常見的三、四、五級(jí)圍巖情況的隧道掌子面失穩(wěn)的臨界水壓力值；以及各種工況下公路隧道在高水壓作用下掌子面附近圍巖的力學(xué)行為。并對(duì)公路隧道在隧道掌子面失穩(wěn)的臨界水壓力值的力學(xué)行為作出了一定的分析、評(píng)價(jià)；提出了在水壓力小于掌子面失穩(wěn)的水壓力臨界值時(shí)，，可以考慮先開挖后支護(hù)的施工方案；但是當(dāng)水壓力大于掌子面失穩(wěn)的水壓力臨界值時(shí)，則必須采取先對(duì)掌子面進(jìn)行支護(hù)然后再開挖的施工方案。
[Abstract]:Since the reform and opening up, in order to adapt to the rapid development of contemporary society, many tunnel projects have been built. And in the construction of the tunnel, there are many problems. The tunnel face collapse is one of the most common problems in tunnel engineering. The factors of tunnel face collapse include geological and hydrological factors, construction factors, design factors, cognition and management factors. This paper mainly studies the influence of water pressure on tunnel face stability, and puts forward relevant construction prevention measures. In order to solve this problem, a finite difference software (FLAC3D) is proposed to simulate the stability of tunnel face when the water pressure is used to simulate the tunnel excavation. The main contents of this paper are as follows: (1) Analysis and evaluation of mechanical behavior and stability of surrounding rock near palm face of highway tunnel with different surrounding rock grade under high water pressure; (2) under the action of high water pressure, the face of highway tunnel face of different surrounding rock grade lose the critical action value of stability; (3) Analysis and evaluation of the mechanical behavior and stability of surrounding rock near the face of highway tunnel with different sizes under the action of high water pressure; (4) under the action of high water pressure, the critical action value of the stability of the face of highway tunnel with different cross section is lost. 5When the critical action value of water pressure is larger than the critical action value of water pressure on the face of the palm, which construction scheme is adopted, and what construction scheme is adopted when the critical action value of water pressure is smaller than the critical action value of water pressure on the face of the palm. After the numerical simulation of FLAC3D software, the critical water pressure values of tunnel face instability are obtained under the three types of tunnel cross section: medium section, large section and large section, which are common in three types of tunnel sections: third, fourth and fifth grade surrounding rock. And the mechanical behavior of surrounding rock near the face of highway tunnel under high water pressure under various working conditions. The mechanical behavior of the critical water pressure of tunnel face instability is analyzed and evaluated, and the construction scheme of excavation and support is considered when the water pressure is less than the critical value of water pressure which is unstable on the face of the tunnel. However, when the water pressure is greater than the critical value of the water pressure of the face, the construction scheme of supporting the face of the face and then excavating must be adopted.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.4

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本文編號(hào)：1983893