發(fā)布時(shí)間：2018-07-09 18:11

  本文選題：海底隧道 + 塌方原因��； 參考：《湖北工業(yè)大學(xué)》2017年碩士論文

【摘要】：在海底隧道施工中,塌方是一種常見的事故,隧道塌方的影響因素很多,治理比較困難,塌方事故一旦發(fā)生,不僅延誤工期,提高工程費(fèi)用,損壞施工機(jī)械,甚至造成人員傷亡。本課題以某電廠位于海底的取排水隧道工程為案例,全面分析了隧道塌方事故發(fā)生的原因,提出海底隧道塌方的處置方案,并運(yùn)用數(shù)值仿真模擬的方法,對(duì)隧道塌方的處置過程進(jìn)行了模擬對(duì)支護(hù)結(jié)構(gòu)的受力特性進(jìn)行了分析,對(duì)處置方案的安全性進(jìn)行了評(píng)價(jià),并對(duì)其進(jìn)行了優(yōu)化分析,,對(duì)以后類似隧道塌方的治理有實(shí)際的指導(dǎo)和借鑒意義。通過分析得出了以下主要結(jié)論:(1)海底隧道局部坍塌的影響因素一般有地質(zhì)條件,地下水,設(shè)計(jì)、施工以及管理因素等幾個(gè)方面。在這些因素中,不良地質(zhì)條件屬于引起隧道坍塌的一個(gè)非常重要的原因,地下水則是隧道塌方的第二位的影響因素。當(dāng)然隧道建設(shè)過程中隧道設(shè)計(jì)、隧道施工和管理中的一些因素也同樣不能忽略,這些都是引起隧道塌方的相關(guān)因素。(2)針對(duì)某電廠取排水隧道工程塌方實(shí)例,可以得到海底隧道洞口段地質(zhì)條件一般較差,圍巖極為破碎、承載能力很差,圍巖級(jí)別一般為Ⅳ或Ⅴ級(jí),若發(fā)生塌方,其基本處置步驟為:塌體控制,塌體表面處理,塌體坡腳加固,塌體內(nèi)部處理,拱頂上部塌腔處理,隧洞開挖支護(hù),塌方體二次開挖支護(hù),監(jiān)控測(cè)量。(3)對(duì)某電廠取排水隧道工程塌方進(jìn)行應(yīng)力場(chǎng)、位移場(chǎng)的數(shù)值模擬得出:上下臺(tái)階開挖會(huì)導(dǎo)致應(yīng)力釋放現(xiàn)象,位移也會(huì)增大,隧道圍巖的最大應(yīng)力主要集中在上下臺(tái)階交接處,施工時(shí)應(yīng)注意此區(qū)域的施工質(zhì)量,及時(shí)施工二襯可以有效的增加隧道圍巖的穩(wěn)定性。(4)如果發(fā)生海底隧道塌方需按照“先治水,后加固;防擴(kuò)大,再處理”這一處置原則進(jìn)行處置,按照工程實(shí)際狀況選擇適合的開挖方法及支護(hù)方式,施工中堅(jiān)持信息化指導(dǎo),不斷提高施工的管理水平,施工中始終要遵循開挖能量最小原理,避免對(duì)圍巖穩(wěn)定性造成影響,這是優(yōu)化海底隧道塌方處置方法的最基本途徑。
[Abstract]:In the construction of subsea tunnel, collapse is a kind of common accident. There are many influencing factors of tunnel collapse, so it is difficult to deal with it. Once the collapse accident occurs, it will not only delay the construction period, but also increase the project cost and damage the construction machinery. It even caused casualties. Taking the drainage tunnel project of a power plant located at the bottom of the sea as an example, the cause of tunnel collapse accident is comprehensively analyzed, and the disposal scheme of subsea tunnel collapse is put forward, and the method of numerical simulation is used. The process of disposal of tunnel collapse is simulated. The mechanical characteristics of supporting structure are analyzed, and the safety of disposal scheme is evaluated. The optimization analysis is carried out, which has practical guidance and reference significance for similar tunnel collapse treatment in the future. The main conclusions are as follows: (1) the influencing factors of subsea tunnel local collapse are generally geological conditions, groundwater, design, construction and management factors. Among these factors, poor geological conditions belong to a very important cause of tunnel collapse, and groundwater is the second factor affecting tunnel collapse. Of course, some factors in tunnel design, tunnel construction and management can not be ignored in the process of tunnel construction. These factors are related factors that cause tunnel collapse. (2) A case study of tunnel collapse in a power plant drainage tunnel. It can be obtained that the geological conditions of the tunnel entrance section are generally poor, the surrounding rock is extremely broken, the bearing capacity is very poor, and the surrounding rock grade is generally 鈪，

本文編號(hào)：2110244