發(fā)布時間：2018-05-26 18:22

  本文選題：隧道 + 充水溶洞�。� 參考：《山東大學(xué)》2017年碩士論文

【摘要】：巖溶地區(qū)地質(zhì)賦存條件復(fù)雜,隧道施工難度大,隧道施工常會遇到涌水、突泥等地質(zhì)災(zāi)害,嚴(yán)重威脅施工安全。本文以重慶歇馬隧道為依托工程,通過室內(nèi)試驗、模型試驗、數(shù)值模擬等手段,對溶洞突涌水破壞模式及致災(zāi)演化機理進行深入的研究,主要內(nèi)容如下:(1)研制了溶洞突水模擬室內(nèi)試驗系統(tǒng),該試驗系統(tǒng)具有系列化、可視化、多類型等特點,且試驗周期短、方便簡潔,適宜進行旨在研究宏觀規(guī)律的大樣本統(tǒng)計試驗。開展了溶洞突水模擬室內(nèi)試驗,模擬了隧道拱頂、拱底、掌子面前方溶洞突水過程,總結(jié)了溶洞突水過程中隔水巖體破壞模式,綜合分析了溶洞突水及隔水巖體處裂隙萌生,演化貫通、突水通道形成直至發(fā)生突水的整個過程。(2)研制了高地應(yīng)力—高滲壓模型試驗系統(tǒng),該系統(tǒng)主要由試驗臺架、地應(yīng)力加載系統(tǒng)、水壓加載系統(tǒng)、控制系統(tǒng)、多元信息監(jiān)測系統(tǒng)、高清視頻監(jiān)測系統(tǒng)組成,該系統(tǒng)具有承載力高、可拓展性強、可視化程度高、自動化程度高等特點。從重慶歇馬隧道工程現(xiàn)場采取灰?guī)r巖樣,通過單軸壓縮試驗、巴西劈裂試驗、三軸壓縮試驗等室內(nèi)試驗,研究巖溶區(qū)灰?guī)r力學(xué)性質(zhì)。開展了隧道施工誘發(fā)溶洞突水致災(zāi)過程模型試驗,分析隧道開挖過程中充水溶洞對隧道圍巖穩(wěn)定性的影響以及隧道突涌水過程中多物理場信息變化規(guī)律,揭示了隧道施工誘發(fā)溶洞突涌水致災(zāi)機理。(3)采用FLAC3D數(shù)值軟件,構(gòu)建三維數(shù)值模型,對隧道前方存在上覆高壓充水溶洞施工進行模擬,分析隧道開挖過程中隧道圍巖位移場、應(yīng)力場、滲流場變化規(guī)律,研究高壓充水溶洞對隧道圍巖穩(wěn)定性的影響。
[Abstract]:The geological conditions in karst area are complicated and the tunnel construction is difficult. The tunnel construction is often met with geological disasters such as water gushing and mud outburst which seriously threaten the construction safety. In this paper, by means of laboratory test, model test, numerical simulation and so on, the failure mode of water gushing and the mechanism of disaster-induced evolution of karst caverns are deeply studied based on the Chongqing Xiangma Tunnel. The main contents are as follows: (1) A water inrush simulation laboratory test system for karst caves has been developed. The system is characterized by serialization, visualization, multi-type, short test period, convenience and simplicity. It is suitable for large sample statistical test to study macroscopic law. In this paper, the water inrush simulation laboratory test of karst cave is carried out, and the water inrush process of the tunnel arch top, arch bottom and front face of the tunnel is simulated. The failure mode of water barrier rock mass during the water inrush process of the cave is summarized, and the water inrush of the cave and the crack initiation at the water-proof rock mass are analyzed synthetically. The model test system of high in-situ stress-high permeability pressure is developed. The system is mainly composed of test bed, in-situ stress loading system, hydraulic pressure loading system, control system, etc. The multi-information monitoring system is composed of high-definition video monitoring system. The system has the characteristics of high bearing capacity, high expansibility, high visualization and high automation. Taking limestone samples from the site of Chongqing Shema Tunnel Project, the mechanical properties of limestone in karst area were studied by laboratory tests such as uniaxial compression test, Brazilian splitting test and triaxial compression test. The model test on the process of water inrush induced by tunnel construction is carried out, and the influence of water-filled karst cave on the stability of tunnel surrounding rock during tunnel excavation is analyzed, as well as the variation law of multi-physical field information in the process of tunnel water inrush. In this paper, the mechanism of water inrush induced by tunnel construction is revealed. The 3D numerical model is constructed by using FLAC3D numerical software, and the construction of overlying high pressure water-filled karst tunnel in front of tunnel is simulated, and the displacement field of surrounding rock during tunnel excavation is analyzed. The influence of high pressure water-filled cavern on the stability of tunnel surrounding rock is studied.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U456.3

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