It is shown from the parallel experimental results that the water tight fly ash concrete can substitute for the rubber water tight board, and the water tight fly ash concrete has more impermeability than the rubber board under the circumstances that permeability pressure of the tunnel is not very high.

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In this paper we combining connecting tunnel project of Subway Line 4 at Xidan-lingjing bystreet in Beijing. To aim at the difficulties of building large-span connecting tunnels in the fine sand layer, through roads and underground pipelines, construction nearby buildings and other project difficulties. Using theoretical analysis, numerical simulation, field tests and other research methods to comprehensive and systemic research the stratum deformation mechanism and process control techniques of shallow excavation method, and a series of results were obtained. Firstly, use the stochastic media theory to analyze the stratum deformation mechanism, concretely analyze the analytic equation of surface horizontal displacement and deformation which were caused by the excavation of single-hole and double-hole tunnel, and further discussion on ground settlement, vertical deformation, surface horizontal displacement and horizontal deformation. Analyzing the main influence factors of surface displacement, and combined with practical work to proof the theory which was applied to shallow buried single-hole tunnel in fine sand layer was scientific.

本文結(jié)合北京地鐵四號線西單～靈境胡同渡線隧道工程，針對在粉細(xì)砂地層中修建大跨渡線隧道色先锋先锋影音AV资源站，下穿道路和地下管線3级电影网站入口，臨近建筑物施工等工程難點(diǎn)，利用理論分析亚洲视频在线观看第五区、數(shù)值模擬看一下最好最好的黄片片最刺激的视频、和現(xiàn)場監(jiān)測等多種研究手段，對淺埋暗挖隧道地層變位機(jī)理及控制技術(shù)久久老司机亚洲精品福利网站，深入地進(jìn)行全面和系統(tǒng)的研究久久精品无码专区免费东京热，并取得以下成果：(1)引入隨機(jī)介質(zhì)理論，對地層變位機(jī)理進(jìn)行了分析黄色A片免费看一级，具體分析了單免费裸体黄网站、雙孔隧道開挖引起的地表位移及變形的解析方程，并深入探討了地表沉降激情在线小说视频、垂直變形、地表水平位移和水平變形的特點(diǎn)欧美黄色二区，同時分析了影響地表位移的主要因素大学超碰在线公开免费日韩大学，并結(jié)合工程實(shí)例，佐證該理論應(yīng)用于粉細(xì)砂地層淺埋暗挖單孔地鐵隧道的科學(xué)性亚洲狼友视频网站。

The selection of geological prospecting in different stages(initial-prospecting, detailed-prospecting)(2)the selection of geological prospecting in the deep-laid and shallow-laid of tunnel project (3)the selection of geological prospecting of tunnel projecting in different geological conditions Finally, the author summed up main problems needing to be solved in tunnel engineering geological prospecting as follow:(1)differentiate stratum and find out the depth and thickness of different stratums in the tunnel section (2)find out geological structure and existence situation of fault, broken zone and weak plane (3)find out weathering level of bed rock to classify surrounding rock combining speed materials (4)differentiate stratum structure of the entrance of tunnel to judge the stability of it (5)find out existence situation and performance of ground water (6)situations of other harmful geological phenomenon In view of above problems and classification of surrounding rock, the author showed principles of rational choosing of methods in geological prospecting and counted disperse range of physical character parameter value in different petrosal character, getting achievements as follow:(1)summarization of effect, merits and demerits of different geological prospecting methods in the tunnel geological investigation (2)method selection and arrangement principle of tunnel engineering geological prospecting in different geological conditions and prospecting stages (3)According to previous experience and cases, the author concluded the物性parameters most in use ,and showed the basis of selecting geological prospecting methods in different geological conditions.

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The surface displacement and deformation caused by the construction of double parallel tunnels is more complex than the single tunnel s.

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Based on the item of national high technology development project, the thesis studies the reasonable construction pattern of the tunnel portal, incidence of the micro-pressure wave and the the effect of bell-mouthed hood, lacunaris hood and expansile hood on alleviating the micro-pressure wave in the situations of single line and double line, obtains the relationship between the max micro-pressure wave and the velocity of the train as well as the relationship between the max micro-pressure wave and distance of measuring point at the velocity of 100km/h-550km/h, compares the different alleviative effect of the three different hood to max micro-pressure wave and finally proposes the reasonable construction pattern of the tunnel portal.

本文針對國家高技術(shù)研究發(fā)展計劃(863計劃)課題"磁浮交通滬杭線越黃浦江隧道的工程技術(shù)問題研究"亚洲免费一区在线，在單洞單線和單洞雙線兩種工況下，對隧道洞口的合理結(jié)構(gòu)形式和影響范圍欧美夫妻生活，以及洞口喇叭形入口緩沖段99r热久久、多孔壁入口緩沖段以及隧道出口膨脹室對減緩微壓波的作用進(jìn)行了研究，得到了磁浮列車速度在100km/h～550km/h時隧道出口微壓波最大值與速度的關(guān)系以及微壓波最大值與測點(diǎn)距離的關(guān)系黄A大片免费播放网站，比較了三種不同形式緩沖結(jié)構(gòu)對微壓波最大值的減緩效果欧美人与动牲性行为视频，提出了隧道洞口的合理結(jié)構(gòu)形式。

Results show that gas release in gassy sand will cause the additive deformation of tunnel and additive stress of the shield segment, and make important impacts on the global displacement of tunnel but little influences on the stress of shield segments and the relative displacement of tunnel. It is inclined to arouse the differential settlement and cracks on the tunnel so as to cause hazardousness. Re-accumulating of the gas can also produce additional stress and the additive resilience, but it can be ignored in practical engineering because the influence degree is small. The shallow gas in reservoirs is appropriate to be discharged before construction of the subway tunnel.

研究結(jié)果表明：氣體釋放將引起隧道產(chǎn)生附加變形和管片附加應(yīng)力黄色视频网在线观看，淺層氣體釋放對地鐵隧道結(jié)構(gòu)應(yīng)力和結(jié)構(gòu)相對變形影響較小国产一级作爱A片免费视频，而對隧道整體位移影響較大，易引起不均勻沉降国内自拍第十六页日韩在线观看视频，導(dǎo)致隧道裂縫或斷裂日韩国产一区，進(jìn)而引發(fā)危險；氣體重新回聚時欧美丰满熟妇XXXX性群菊，隧道產(chǎn)生的附加應(yīng)力和回彈位移量較小色图五月天，工程中可不予考慮；地鐵隧道施工前黄色视频网址免费看，宜對淺層氣體進(jìn)行預(yù)先排放欧美日韩精品精品区。

The results show that for the single-track shield tunnel in actual projects,the longitudinal ventilation velocity of 2.6~2.9 m/s can effectively prevent smoke from counter flow at a heat release rate of 10 MW;when the tunnel sector on fire with a longitudinal velocity of 2.9 m/s and the unfired tunnel sector with the velocity of 1~1.5 m/s from both ends,there is an air flow with the velocity of 6 m/s ...

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A tunneling machine for producing large tunnels in soft rock or wet, clayey, unconsolidated or bouldery earth by simultaneously detaching the tunnel core by thermal melting a boundary kerf into the tunnel face and forming a supporting excavation wall liner by deflecting the molten materials against the excavation walls to provide, when solidified, a continuous wall supporting liner, and detaching the tunnel face circumscribed by the kerf with powered mechanical earth detachment means and in which the heat required for melting the kerf and liner material is provided by a compact nuclear reactor.

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The entrance section of FuXi Double-arched Tunnel is modeled in the fact of factual shallow buried and unsymmetrical pressure condition. Adopting the three heading construction method to simulate twelve kinds of construction projects, confirm reasonable construction orders and left and right tunnel face interval, systematically analyze and research the changing law of the tunnel deformation and surrounding rock stress in soft and cracked condition of surrounding rock,bring forward pertinent advices against construction disease; Build the deep buried tunnel model in middle section of tunnel , separately adopt the central heading bench cut benching method and the central heading full cross method to simulate ten kinds of construction projects, establish the reasonable construction orders, sidestep length and tunnel face interval, which are due to the deep buried tunnel, systematically analyze and research the change law of the tunnel deformation and surrounding rock stress in the section with good surrounding rock condition, bring forward the reasonable construction projects which can make sure of construction safety and save construction time; Because the central wall is disturbed many times during constructing process, its displacement and stress distribution is very complex.

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