【正文】 ................................................................... 16 初期支護(hù)設(shè)計(jì) ...................................................................................................... 16 Ⅴ級(jí)圍巖初期支護(hù)計(jì)算 ............................................................................ 16 噴射混凝土提供的支護(hù)抗力 P1 值 .......................................................... 17 鋼支撐提供的支護(hù)抗力 P2 值 .................................................................. 19 錨桿提供的支護(hù)抗力 P3 值 ...................................................................... 20 圍巖本身提供的支護(hù)抗力 值 ............................................................... 21 4p 最小支護(hù)抗力值 ................................................................................ 23 min第五章 二次襯砌計(jì)算 ............................................................................................... 26 緒論 ...................................................................................................................... 26 計(jì)算條件 .............................................................................................................. 26 隧道深淺埋類型的確定 ...................................................................................... 26 Ⅴ級(jí)圍巖圍二次襯砌計(jì)算 .................................................................................. 27 圍巖壓力的確定： .................................................................................... 27 Ⅴ級(jí)圍巖二襯理正驗(yàn)算 ............................................................................ 28 Ⅴ級(jí)圍巖二襯計(jì)算條件 ............................................................................ 29 Ⅴ級(jí)圍巖二襯內(nèi)力配筋結(jié)果 .................................................................... 31 Ⅴ級(jí)圍巖二襯內(nèi)力配筋計(jì)算 .................................................................... 31 Ⅴ級(jí)圍巖二襯裂縫計(jì)算 ............................................................................ 33 IV 級(jí)圍巖圍二次襯砌計(jì)算 ................................................................................. 37 設(shè)計(jì)要求 .................................................................................................... 38 隧道深淺埋類型定 .................................................................................... 38 圍巖壓力的確定 ........................................................................................ 38 iii / 81 IV 級(jí)圍巖圍二次襯砌計(jì)算 ....................................................................... 39 IV 級(jí)圍巖圍二次襯砌計(jì)算條件 ............................................................... 39 內(nèi)力配筋結(jié)果 ............................................................................................ 41 內(nèi)力配筋計(jì)算 .............................................................................................. 42 裂縫計(jì)算 .................................................................................................... 43 第六章 施工組織設(shè)計(jì) ............................................................................................... 47 概論 ...................................................................................................................... 47 施工總體方案 ...................................................................................................... 47 開挖設(shè)計(jì) .............................................................................................................. 48 明挖法 ........................................................................................................ 48 全斷面開挖 ................................................................................................ 49 臺(tái)階法施工 ................................................................................................ 49 帶臨時(shí)仰拱的臺(tái)階法 ................................................................................ 51 爆破設(shè)計(jì) .............................................................................................................. 52 Ⅱ、Ⅲ級(jí)圍巖段爆破設(shè)計(jì) ........................................................................ 52 Ⅳ級(jí)圍巖段爆破設(shè)計(jì) ................................................................................ 53 V 級(jí)圍巖段爆破設(shè)計(jì) ................................................................................ 54 爆破施工 .................................................................................................... 55 地質(zhì)超前預(yù)報(bào) ...................................................................................................... 57 超前支護(hù) .............................................................................................................. 57 超前小導(dǎo)管設(shè)計(jì)參數(shù) ................................................................................ 57 超前小導(dǎo)管施工 ........................................................................................ 57 初期支護(hù) .............................................................................................................. 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(hù)與拆模 .................................................................... 63 第七章 防排水及通風(fēng)設(shè)計(jì) ...................................................................................... 64 iv / 81 防排水設(shè)計(jì) ............................................................................