Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了頻率對(duì)井下電磁波傳輸特性的影響欧美精品理论片大全，采用金屬波導(dǎo)法分析了圓形91麻豆精品福利、拱形及彎曲隧道中電磁波的傳輸特性并給出衰減率近似公式色哟哟精品网站在线观看，得出主要結(jié)論：在圓形和拱形隧道中国产精品刷精一二三在线，頻率越高AⅤ免费一级，衰減率越小国产精品视频2021，越有利于電磁波的傳播；在彎曲隧道中无码AA在线，頻率越高国产人妖，衰減率越大，不利于電磁波的傳播蒙古老熟女刚交BBW；通過特性曲線與井下實(shí)驗(yàn)數(shù)據(jù)相比較得出在900MHz左右為井下無線通信系統(tǒng)傳輸信號(hào)最佳頻段视频亚洲日韩欧美。

With the rapid development of our country"s transportation and the implementation of the state"s the policy of the Great Development of the Western Regions, a great many tunnels will be built in elevations areas or circumpolar areas in the Big West. Compared with traditional tunnels in the cold area, these tunnels will take large size and require higher technology. Moreover, the extreme climatic conditions are very unfavorable for these tunnels.

隨著我國交通事業(yè)的快速發(fā)展，特別是西部大開發(fā)和振興東北經(jīng)濟(jì)政策的進(jìn)一步落實(shí)亚洲欧洲久久久国产精品无码，在西部的高海拔和北部的高緯度寒冷地區(qū)將陸續(xù)有大量的隧道建成女性精品黄色网，與以往寒冷地區(qū)的隧道相比，這些隧道的規(guī)模會(huì)更大欧美一级视频在线、技術(shù)要求更高黄页站免费观看，而氣候條件卻更加惡劣。

Degree B-Spline curve is chosen to fit the longitudinal settlement curves, which solves the problem of curvature continuum for joint notes due to its continuous second derivative vector and overcomes the efficiency and accuracy of computing curvature with 3 points by hand.

選取三次B樣條方法對(duì)隧道縱向累計(jì)沉降曲線進(jìn)行擬合jizz日本jizz，利用三次B樣條曲線二階導(dǎo)矢連續(xù)的特性日本永久网站高清免费不卡，解決了擬合曲線在曲線連接點(diǎn)處曲率的連續(xù)性問題，克服了以往人工計(jì)算隧道曲率半徑在效率和準(zhǔn)確性方面的缺陷人妻三级视频；并在此基礎(chǔ)上亚洲人妻无码天堂，推導(dǎo)了隧道縱向變形曲率與縱向螺栓拉應(yīng)力、相對(duì)彎曲與縱向螺栓剪應(yīng)力之間的關(guān)系； 3在线观看日韩黄片。

As the sample of Yuanliangshan tunnel in Chongqing-Huaihua Railway, based on the full analysis of groundwater specimens, five chemical equations are designed to calculate evaluating data by the relation of activity, equilibrium constant and Gibbs free energy. According to the two criterion of partial pressure of carbon dioxide and reaction direction, the result calculated shows the groundwater has weak corrasion to carbonate rocks, which should be avoided to do harm to tunnel.

以渝懷線圓梁山隧道為實(shí)例一级黄片录像，通過隧道內(nèi)地下水取樣進(jìn)行了全分析，其中CO(上標(biāo) 2-下標(biāo) 3)離子作為"中間過渡態(tài)"離子国产人成网站18禁止免费网站，由于只存在微小量未被檢出精品亚洲福利在观看；使用水質(zhì)分析結(jié)果數(shù)據(jù)設(shè)計(jì)了五個(gè)化學(xué)反應(yīng)方程式，通過活度欧美zoo交、反應(yīng)平衡常數(shù)及吉布斯自由能之間關(guān)系進(jìn)行熱力學(xué)計(jì)算日本亚洲欧洲天堂在线，依據(jù)二氧化碳?xì)怏w分壓P(下標(biāo) CO2)與反應(yīng)進(jìn)行兩個(gè)方向化學(xué)反應(yīng)判據(jù)開展分析，結(jié)果表明地下水具有弱侵蝕性国产欧洲亚洲入口AV，在隧道工程中應(yīng)避免其引起危害午夜丝袜小说视频自拍偷拍。

There may be some difference between the critical velocity in a sloping tunnel and that in a horizontal tunnel, due to effect of slope.

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And the preparing method has the steps of: fixing the charge transfer complex on a scanning tunnel microscope, starting up the cut mode of the scanning tunnel, controlling the motion of pointer of the scanning tunnel, applying a voltage pulse between the charge transfer complex and the pointer, writing the information hole array in the charge transfer complex.

按如下過程進(jìn)行制備：將電荷轉(zhuǎn)移復(fù)合物固定于掃描隧道顯微鏡上，啟動(dòng)掃描隧道顯微鏡的刻寫模式丁香色色五月天，控制掃描隧道顯微鏡的針尖的運(yùn)動(dòng)久久伊人中文字幕色综合，在電荷轉(zhuǎn)移復(fù)合物和針尖之間施加電壓脈沖，在電荷轉(zhuǎn)移復(fù)合物上寫入信息孔陣欧美一级多人婬片人妻欧美大片。

Numerical solution was compared with and theoretical one,and the influence of shear dilatation on the stress and displacement.

利用現(xiàn)階段國內(nèi)外流行的巖土數(shù)值分析軟件FLAC3D亚洲无码黄色毛片，模擬分析了圓形隧道圍巖不同階段的應(yīng)力和位移，并把數(shù)值解和理論解析解進(jìn)行了對(duì)比久久午夜一级A片；分析了剪脹性對(duì)于隧道圍巖應(yīng)力位移的影響欧美性爱淫图，對(duì)隧道工程的設(shè)計(jì)和施工有指導(dǎo)作用和參考價(jià)值。

There is a great impact on adjacent pile foundation due to the excess ground movements by tunneling, which will disserve the safety of adjacent buildings. The study on the influence of tunneling to the behaviors of adjacent piles is very important for the safety of adjacent buildings, and it is an urgent problem for developing city subway tunnels cosmically.

城市地鐵隧道開挖引起地層變形超過一定范圍av网站有哪些，將對(duì)鄰近建筑物樁基礎(chǔ)產(chǎn)生較大影響亚州图片在线，危及鄰近建筑物的安全，故研究隧道施工對(duì)鄰近樁基工作性狀的影響一级特黄视频免费在线观看影视资讯，對(duì)確保鄰近建筑物的安全尤為重要伊甸2021，是我國大規(guī)模發(fā)展城市地鐵隧道必須解決的緊迫課題。

Ground loss model of tangent double circles is adopted to establish a uniform ground movement pattern of shield tunnel by introducing the coordinate parameter of movement focus.

土質(zhì)軟硬決定了隧道周圍土體的移動(dòng)方向九一视频在线观看精品，移動(dòng)焦點(diǎn)在隧道中心點(diǎn)與隧道底部位置之間變動(dòng)天天日天天干天天日天天。

On the basis of the knowledge highway's ruin of the past, in high earthquake intensity area of highway, underground structure may be fall into ruin for the seismic motion, especially, the entrance of tunnel is the weakest of the tunnel. As based on the soil-structure interaction model, adopting the soft of FLAC3D and numerical analysis method, the tunnel entrance has been computed by the elastic and plastic method, the results obtained are discussed and the measures for design and solution are presented.

根據(jù)以往的受震破壞經(jīng)驗(yàn)，在公路隧道的高烈度地震帶观看日本黄色网络视频，地下工程可能會(huì)遭受嚴(yán)重震害jiujiuren，尤其洞口段為抗震薄弱區(qū)，本文采用FLAC3D軟件欧美一级黑人黄片，從土－結(jié)構(gòu)相互作用模型出發(fā)日本黄色网站免费在线看，運(yùn)用數(shù)值分析方法對(duì)隧道洞口段進(jìn)行了三維彈性和彈塑性分析日韩精品第四页在线观看视频，得出了相應(yīng)結(jié)論，并對(duì)結(jié)果進(jìn)行分析日日做夜夜操，指出隧道抗減震設(shè)計(jì)中應(yīng)注意的事項(xiàng)全免费一级毛片免费看在线，并提出相應(yīng)解決措施。