【正文】 ....................................................................... 33 IV 級圍巖圍二次襯砌計算 ................................................................................. 37 設(shè)計要求 .................................................................................................... 38 iii 隧道深淺埋類型定 .................................................................................... 38 圍巖壓力的確定 ........................................................................................ 38 IV 級圍巖圍二次襯砌計算 ....................................................................... 39 IV 級圍巖圍二次襯砌計算條件 ............................................................... 39 內(nèi)力配筋結(jié)果 ............................................................................................ 41 內(nèi)力配筋計算 .............................................................................................. 42 裂縫計算 .................................................................................................... 43 第六章 施工組織設(shè)計 ............................................................................................... 47 概論 ...................................................................................................................... 47 施工總體方案 ...................................................................................................... 47 開挖設(shè)計 .............................................................................................................. 48 明挖法 ........................................................................................................ 48 全斷面開挖 ................................................................................................ 49 臺階法施工 ................................................................................................ 49 帶臨時仰拱的臺階法 ................................................................................ 51 爆破設(shè)計 .............................................................................................................. 52 Ⅱ、Ⅲ級圍巖段爆破設(shè)計 ........................................................................ 52 Ⅳ級圍巖段爆破設(shè)計 ................................................................................ 53 V 級圍巖段爆破設(shè)計 ................................................................................ 54 爆破施工 .................................................................................................... 55 地質(zhì)超前預(yù)報 ...................................................................................................... 57 超前支護 .............................................................................................................. 57 超前小導(dǎo)管設(shè)計參數(shù) ................................................................................ 57 超前小導(dǎo)管施工 ........................................................................................ 57 初期支護 .............................................................................................................. 57 噴射混凝土 ................................................................................................ 58 錨桿 ............................................................................................................ 58 鋼筋網(wǎng) ........................................................................................................ 61 格柵鋼架 .................................................................................................... 61 二次襯砌 .............................................................................................................. 62 概述 ............................................................................................................ 62 二次襯砌施工準(zhǔn)備工作 ............................................................................ 63 混凝土的灌注、養(yǎng)護與拆模 .................................................................... 63 iv第七章 防排水及通風(fēng)設(shè)計 ...................................................................................... 64 防排水設(shè)計 .......................................................................................................... 64 施工縫、變形縫防水 ................................................................................ 64 隧道洞口防排水 ........................................................................................ 65 洞頂截水天溝設(shè)計 .................................................................................... 65 洞內(nèi)外排水銜接 ........................................................................................ 65 治水過程中的環(huán)境問題 ............................................................................ 65 隧道通風(fēng) .............................................................................................................. 66 隧道通風(fēng)類型 ............................................................................................ 66 隧道通風(fēng)設(shè)計 ............................................................................................ 66 第八章 監(jiān)控量測 ......................................................................................................... 67 量測目的 .............................................................................................................. 67 監(jiān)控量測項目 ...................................................................................................... 67 監(jiān)控量測的主要設(shè)備 .......................................................................................... 67 監(jiān)控量測流程 ...................................................................................................... 68 監(jiān)控量測測點布置、測量斷面 .......................................................................... 68 地表沉降監(jiān)測 ............................................................................................ 68 洞內(nèi)監(jiān)控量測 ............................................................................................ 69 圍巖壓力和兩層襯砌間壓力量測 ........................