The results show that the infinite method is valid in solving problems in infinite domain and thus high precision can be obtained by eliminating the border effect in finite element analysis.

采用具有精確解的無限厚壁圓筒作有限單元法分析和無限單元法分析1级黄片免费看，通過對(duì)這兩種分析方法的分析結(jié)果的比較得知：無限單元法是解決無限域問題的一種有效的方法，采用這種分析方法進(jìn)行隧道及地下工程結(jié)構(gòu)分析，可以消除有限單元法所帶來的邊界效應(yīng)，從而使計(jì)算精度大為提高国产又粗又猛又爽的野外视频。

As a result, it is an urgent realistic problem that land subsidence induced by tunneling is forecasted and controlled so as to ensure the safety of close-by building and buried pipeline.

因此，如何在隧道施工過程中防止坍塌并可靠地預(yù)計(jì)和有效地控制施工所引起的地面沉陷以保護(hù)工程沿線建筑物和地下管線的安全5要A片欧美无线看，已成為城市地鐵工程建設(shè)中必須解決的一項(xiàng)重要課題亚洲欧洲美洲无码精品Va水蜜桃。

Furthermore, bad economic loss and social effect can be brought about. As a result, it is an urgent realistic problem that land subsidence induced by tunneling is forecasted and controlled so as to ensure the safety of close-by building and buried pipeline.

因此，如何在隧道施工過程中防止坍塌并可靠地預(yù)計(jì)和有效地控制施工所引起的地面沉陷以保護(hù)工程沿線建筑物和地下管線的安全欧美视频一区二二区，已成為城市地鐵工程建設(shè)中必須解決的一項(xiàng)重要課題欧美一级淫片在线观看。

And the excavation of tunnels and underground engineering which continuously changes in time and space is a dynamic process. Therefore, research on the structural stability of country rock and support is meaningful and of practical significance to highway tunnel excavation.

隧道和地下工程的開挖是一個(gè)在時(shí)間和空間上不斷變化的動(dòng)態(tài)過程，因此對(duì)圍巖與支護(hù)結(jié)構(gòu)穩(wěn)定性問題的研究具有一定的理論及實(shí)際意義wwwbbbbcom。

But the strata with high ground water level are composed of alluvium clays5566资源在线、 silty clay、 gravels and crushed stone soils in Chengdu;And the shield will drive in the interzone with complicated geologic environment, especially in the strata contained more than 50 percent of grav

而成都地鐵工程將主要穿越由沖積粘性土久久精品国产精品青草色艺、粉土、砂礫和碎石類土組成的覆蓋層内地三级精品自拍，地下水位高麻豆九一PORNY，盾構(gòu)將通過大量地質(zhì)條件和環(huán)境條件均極為復(fù)雜的區(qū)間，特別是地層中還夾雜有大漂石在线黄网精品、膠結(jié)礫石層成黄色激情视频网站、粉細(xì)砂透鏡體，隧道圍巖中直徑大于5cm的礫石含量一般都在50%以上国产一级视频性交，最大的漂石直徑達(dá)1m左右黄色AV免费观看网站，且地面多為建筑物密集的繁華地區(qū)，施工難度大日韩uuu，國內(nèi)尚無先例免费欧黄色网站，在國外也無完全成熟的經(jīng)驗(yàn)。

By a series of processing and analyzing the three-dimensional space various graphs and images of seismic wave, many mechanical parameters of rock and soil are computed.

通過對(duì)三維數(shù)據(jù)結(jié)構(gòu)的一系列處理分析形成三維空間地震波的各種圖形圖像国产洗澡网站，最終計(jì)算巖土體多種力學(xué)參數(shù)偷拍网站大全，從而實(shí)現(xiàn)對(duì)隧道及地下工程前方地質(zhì)情況的判譯、預(yù)報(bào)一个人在线视频免费观看片毛片。

Underground engineering ; Subway ; Subaqueous tunnel ; Paleochannel ; Groundwater environment.

地下工程性爱日本三级片aa；地鐵；水底交通隧道国内精品自产拍在线观看999；古河道十八美女禁黄网站；地下水環(huán)境

This project is to be considered as a triumph of the art of tunneling over the underground.

這個(gè)項(xiàng)目被認(rèn)為是隧道工程的藝術(shù)戰(zhàn)勝地下的凱旋。

Research Center of Tunneling and Underground Engineering, Beijing Jiaotong University, Beijing 100044, China

北京交通大學(xué)隧道與地下工程試驗(yàn)研究中心，北京100044

Now right to the left of where he is standing is a little tunnel leading underground.

在他所站的位置左邊是一個(gè)通向地下的隧道免费看黄片的网站。