麻崖子特长公路隧道结构安全性评价

发布时间：2018-05-01 20:49

本文选题：公路隧道 + 安全性评价　；参考：《长安大学》2014年硕士论文

【摘要】：当前公路隧道在我国发展速度很快，数量急剧增加，与此同时，大量的公路隧道出现了各种病害问题，这些问题对隧道结构的安全和隧道的正常运营造成巨大的影响，因此，对隧道结构安全性评价的研究显得尤为重要，本文主要以兰海高速麻崖子隧道为依托，针对其三种不同围岩级别下的支护形式，建立相应的ANSYS有限元模型。计算存在问题断面的隧道结构内力，依据隧道的结构内力和安全系数对隧道进行安全性评价，最后再对隧道安全的可靠性进行分析。提出合理可行的安全对策措施，为今后类似地区隧道工程的设计、施工提供借鉴。本文的思路如下：（1）整理麻崖子隧道质量检测得到的现场数据，挑取检测过程中发现的不符合规范的断面，以及出现严重病害的问题断面。通过这些数据对隧道结构的安全做初步的了解。（2）利用ANSYS有限元分析软件建立隧道结构模型，确定之前挑取出的问题断面参数，针对各个断面的具体问题，计算其结内力，通过得到的内力计算出隧道结构的安全系数，对隧道结构做安全性评价。（3）应用ANSYS有限元分析软件中的PDS模块，应用蒙特卡罗中的拉丁超立方法分析隧道的衬砌结构的安全可靠性。通过上述分析得到了一下的主要结论：（1）隧道结构安全性评价中，隧道的初期支护和二次衬砌厚度对隧道安全性有一定的影响，当厚度与规定值相差不大时，安全系数仍然可以满足规范要求，，但是初期支护也围岩之间、二次衬砌与初期支护之间的空洞对隧道结构的安全性影响较大，安全系数较低仅为0.51。（2）隧道结构安全可靠度分析中，二次衬砌的最大弯曲拉应力和最大弯曲及偏心受压应力的可靠度均为95%，处于安全状态。对隧道二次衬砌灵敏度计算后得到：对二次衬砌弯曲拉应力和弯曲偏心受压应力影响较大的随机变量是二次衬砌的厚度，秩相关系数分别为：-0.9672和0.9667。
[Abstract]:At the same time , the development speed of tunnel in China is very fast and the quantity is increasing rapidly . At the same time , a lot of highway tunnels have various disease problems . These problems have great influence on the safety of tunnel structure and the normal operation of the tunnel . Therefore , the tunnel structure internal force of the problem section is calculated . According to the structure internal force and safety factor of the tunnel , the safety evaluation of the tunnel is carried out . Finally , the reliability of tunnel safety is analyzed . The reasonable and feasible measures are put forward to provide reference for the design and construction of tunnel engineering in similar areas in the future . The thinking of this paper is as follows :

( 1 ) Collect the site data obtained from the quality inspection of the tunnel quality , pick out the cross - section found in the inspection process and the cross - section of the serious disease , and make a preliminary understanding of the safety of the tunnel structure through these data .

( 2 ) establishing the tunnel structure model by using ANSYS finite element analysis software , determining the problem section parameters taken out before , calculating the internal force of the tunnel aiming at the specific problems of each section , calculating the safety factor of the tunnel structure through the obtained internal force , and carrying out safety evaluation on the tunnel structure .

( 3 ) Using the PDS module in ANSYS finite element analysis software , the safety and reliability of the lining structure of the tunnel are analyzed by using the Latin hyperstand method in Monte Carlo .

Through the above analysis , the main conclusions are as follows :

( 1 ) In the safety evaluation of tunnel structure , the initial support and secondary lining thickness of the tunnel have some influence on the safety of the tunnel . When the thickness is different from the specified value , the safety factor can still meet the specification requirement , but the initial support is also between the surrounding rock , and the cavity between the secondary lining and the initial support has great influence on the safety of the tunnel structure , and the safety factor is only 0.51 .

( 2 ) In the reliability analysis of tunnel structure , the maximum bending tensile stress and the maximum bending of the secondary lining and the reliability of the eccentric compressive stress are 95 % and are in a safe state . After calculation of the sensitivity of the secondary lining of the tunnel , the random variables which have great influence on the bending tensile stress and the bending eccentric compressive stress of the secondary lining are the thickness of the secondary lining , and the rank correlation coefficient is - 0.996 72 and 0.996 67 respectively .

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452.1;U457

【参考文献】