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九綿高速JL8總監(jiān)辦段落小構(gòu)造對隧道掘進的影響及其應對措施

2025-10-21 12:58:13  何德斌 admin 閱讀(2077)

修建綿九高速公路的意義:綿陽至九寨溝高速公路建成后,將對沿線的江油、平武、北川和九寨溝等地的經(jīng)濟社會發(fā)展起到積極的帶動作用。特別對加快平武、北川等地災后恢復重建,增強路網(wǎng)抗災防災能力,開發(fā)沿線旅游資源,幫助沿線羌族、藏族少數(shù)民族群眾脫貧致富,維護地區(qū)穩(wěn)定和民族團結(jié)都具有十分重要的意義。

綿九高速公路地質(zhì)構(gòu)造在大地構(gòu)造位置上隸屬于揚子地臺與松潘甘孜地槽褶皺系、秦嶺地槽褶皺系的交匯交匯部位,位于虎牙斷裂帶的東側(cè);綿九高速公路與龍門山構(gòu)造(斷裂)帶的關(guān)系:線路橫跨龍門山構(gòu)造帶。我們所轄的24、25、26合同段線路位于龍門山后山大斷裂帶內(nèi)汶川--茂縣--平武--青川;(見圖片)地質(zhì)構(gòu)造復雜,區(qū)域內(nèi)經(jīng)歷了多次地質(zhì)構(gòu)造運動期(如燕山運動,喜山運動等大的構(gòu)造運動期),龍門山構(gòu)造帶經(jīng)歷了多次大地震,如1933年8月25日疊溪地震;1976年8月16日松潘平武地震;2008年5月12日汶川大地震等;由于受構(gòu)造運動影響,區(qū)域內(nèi)褶曲、斷裂等構(gòu)造十分發(fā)育,特別是龍門山斷裂構(gòu)造最為突出,其斷裂規(guī)模大,破碎帶寬,活動性強,形成一系列不同形態(tài),方向,性質(zhì),級別,序次的褶曲、斷裂構(gòu)造,這些構(gòu)造對地層造成了極大的破壞,對隧道掘進影響極大,如龍門山中央斷裂距離邊家坪隧道出口僅1.5LM。

由于受地質(zhì)構(gòu)造影響強烈,次級構(gòu)造(包括隧道掌子面揭露的小構(gòu)造)發(fā)育,軟質(zhì)巖(如絹云千枚巖)內(nèi)還發(fā)育多條韌性剪切破碎帶,隧道在掘進過程中不可避免地會遇到圍巖斷裂,褶曲等局部的小構(gòu)造,而正是這些局部的小構(gòu)造致使掌子面掘進工作中產(chǎn)生坍塌、冒落、涌水等地質(zhì)災害,嚴重威脅安全生產(chǎn)和隧道正常掘進;在隧道掌子面出現(xiàn)的小構(gòu)造,有的可以看到全貌;有的只能看到局部,但它們都對隧道掘進造成了安全威脅并影響掘進速度,下面以實際案例作詳細闡述。

路基25合同段杏樹山隧道進口左、右洞:在掘進過程中,先后遇到斷層,褶曲等地質(zhì)構(gòu)造(見照片),致圍巖(以灰-灰黑色薄層狀絹云千枚巖為主夾少量脈狀和團塊狀石英巖)呈破碎-較破碎,局部極破碎,巖體出現(xiàn)擾曲扭曲變形,無自穩(wěn)能力;掌子面出現(xiàn)圍巖坍塌、冒落,地下水增大加快軟化圍巖等現(xiàn)象,嚴重威脅施工安全,無法正常掘進;經(jīng)業(yè)主代表,監(jiān)理,設計代表,項目部人員現(xiàn)場觀察后確定:變更襯砌類型,提高支護強度,加強超前支護(變單層小導管為雙層小導管),以“短進尺,弱爆破”等手段通過小構(gòu)造影響破壞等不良地質(zhì)帶。

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三圣廟隧道出口左洞:在隧道掘進至ZK169+476-ZK169+466處,掌子面圍巖(灰-深灰色薄-中厚層狀絹云千枚巖)發(fā)生大面積坍塌、冒落且伴有點滴-線流狀地下水流出,無法安全施工,進度受阻;其原因就是隧道近鄰龍門山中央斷裂帶,隧道附近主要有高莊復向斜和轎子頂復背斜,受構(gòu)造影響強烈,圍巖受構(gòu)造擠壓產(chǎn)生褶曲、離層,圍巖整體性極差,多呈碎裂狀,巖體無自穩(wěn)能力(見下圖);應對措施:為了保證安全施工,盡量減少坍塌,決定采取“短進尺,弱爆破”的方法繼續(xù)掘進,同時將原設計襯砌類型X5c變更為X5b,超前支護由單層超前注漿小導管變更為雙層超前注漿小導管,此舉一是加強初支強度,二是加強超前支護,以應對地下水軟化圍巖而造成圍巖離層坍塌。(注:現(xiàn)場圍巖情況與超前地質(zhì)預報[HSP第2020-02期]中預報的有“軟弱破碎帶發(fā)育及可能有地下水出露,開挖時易存在掉塊、滑塌風險”基本吻合。)


平南隧道出口右洞2020年8月8日平南隧道出口右洞掌子面發(fā)生坍塌,打垮鋼拱架多榀,垮塌的鋼拱架壓在打鉆臺車上,致臺車無法移出。(見下圖)。坍塌現(xiàn)場情況:從掌子面拱頂中部至掌子面右側(cè)伴隨巖塊冒落地下水呈小股狀流出,掌子面右側(cè)拱頂局部坍塌,形成高4.5m,寬4m,深6m的V字形塌腔。坍塌原因分析:(1)隧址區(qū)發(fā)育有兩條斷層和兩條韌性剪切破碎帶:F23、F24;E12、E13;巖體在構(gòu)造擠壓作用下,層間發(fā)生摩擦,在巖體表面可見檫痕,(2)爆破產(chǎn)生的裂隙溝通地下水水力通道,致掌子面地下水增大;(3)掌子面圍巖以灰-灰綠色薄層狀絹云千枚巖為主,夾有少量灰色薄-中厚層狀泥質(zhì)灰?guī)r;圍巖節(jié)理裂隙發(fā)育,圍巖整體性極差,無自穩(wěn)能力,(4)地下水侵蝕加快圍巖軟化、離層,最后在施工(人為擾動)時產(chǎn)生坍塌。

應對措施;(1)掌子面暫停施工,待坍塌結(jié)束,圍巖穩(wěn)定后再行處理。(2)K177+172.2—K177+169.2段已施工初期支護進行拆除。K177+172—K177+162段支護類型由原設計Z4b(I16工字鋼,間距1m)變更為Z5b(I18b工字鋼,間距0.6m),超前支護變更為70根雙層φ42*4mm注漿小導,管,縱向間距1.2m,并在塌腔位置預留2根注漿管,待該段初支完畢后在初支背面泵送1m深的C25混凝土。

結(jié)論:通過上述三個案例的分析,可以得出以下結(jié)論:

1、由于綿九高速公路線路橫跨龍門山構(gòu)造帶,受構(gòu)造影響強烈;隧道掘進過程中必然會遇到次級構(gòu)造(小構(gòu)造)的影響,隧道內(nèi)存在斷層褶曲及韌性剪切破碎帶,對隧道安全順利掘進會產(chǎn)生較大的影響;

2、進施工安全的影響,積極應對,主動避險;在施工過程中注意觀察圍巖變化,根據(jù)圍巖變化情況及時調(diào)整襯砌類型,加強超前支護;

加強超前地質(zhì)預報,加強監(jiān)控量測,為隧道掘進提供技術(shù)支撐;

3、施工部門要認真學習、重視超前地質(zhì)預報提供的信息,充分發(fā)揮地質(zhì)預報對隧道掘進的指導作用,及時與預報部門溝通聯(lián)系,從而達到安全順利施工的目的。




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article------>{"id":661,"cid":20,"subCid":null,"title":"九綿高速JL8總監(jiān)辦段落小構(gòu)造對隧道掘進的影響及其應對措施","shortTitle":null,"tagId":null,"attr":null,"articleView":null,"source":"何德斌","author":"admin","description":"修建綿九高速公路的意義:綿陽至九寨溝高速公路建成后,將對沿線的江油、平武、北川和九寨溝等地的經(jīng)濟社會發(fā)展起到積極的帶動作用。特別對加快平武、北川等地災后恢復重建,增強路網(wǎng)抗災防災能力,開發(fā)沿線旅游資源","img":"/public/uploads/material/2020-09-09/5f582c8871e67_thumb.jpg","content":"<p style=\"text-align: left; text-indent: 37px;\"><span style=\"font-size: 14px;\"><span style=\"line-height: 33px;\"><span style=\"font-family: Calibri,sans-serif;\"><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\">修建綿九高速公路的意義:綿陽至九寨溝高速公路建成后,將對沿線的江油、平武、北川和九寨溝等地的經(jīng)濟社會發(fā)展起到積極的帶動作用。特別對加快平武、北川等地災后恢復重建,增強路網(wǎng)抗災防災能力,開發(fā)沿線旅游資源,幫助沿線羌族、藏族少數(shù)民族群眾脫貧致富,維護地區(qū)穩(wěn)定和民族團結(jié)都具有十分重要的意義。</span></span></span></span></span></p><p style=\"text-align: left; text-indent: 37px;\"><span style=\"font-size: 14px;\"><span style=\"line-height: 33px;\"><span style=\"font-family: Calibri,sans-serif;\"><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\">綿九高速公路地質(zhì)構(gòu)造在大地構(gòu)造位置上隸屬于揚子地臺與松潘甘孜地槽褶皺系、秦嶺地槽褶皺系的交匯交匯部位,位于虎牙斷裂帶的東側(cè);綿九高速公路與龍門山構(gòu)造(斷裂)帶的關(guān)系:線路橫跨龍門山構(gòu)造帶。我們所轄的24、25、26合同段線路位于龍門山后山大斷裂帶內(nèi)</span></span></span></span></span><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\">(<span style=\"background: white;\">汶川--茂縣--平武--青川<span style=\"color: rgb(51, 51, 51);\">)</span></span></span></span><span style=\"font-size: 14px;\"><span style=\"line-height: 33px;\"><span style=\"font-family: Calibri,sans-serif;\"><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\"><span style=\"background: white;\"><span style=\"color: rgb(51, 51, 51);\">;</span></span>(見圖片)地質(zhì)構(gòu)造復雜,區(qū)域內(nèi)經(jīng)歷了多次地質(zhì)構(gòu)造運動期(如燕山運動,喜山運動等大的構(gòu)造運動期),龍門山構(gòu)造帶經(jīng)歷了多次大地震,如1933年8月25日疊溪地震;1976年8月16日松潘平武地震;2008年5月12日汶川大地震等;由于受構(gòu)造運動影響,區(qū)域內(nèi)褶曲、斷裂等構(gòu)造十分發(fā)育,特別是龍門山斷裂構(gòu)造最為突出,其斷裂規(guī)模大,破碎帶寬,活動性強,形成一系列不同形態(tài),方向,性質(zhì),級別,序次的褶曲、斷裂構(gòu)造,這些構(gòu)造對地層造成了極大的破壞,對隧道掘進影響極大,如龍門山中央斷裂距離邊家坪隧道出口僅1.5LM。</span></span></span></span></span></p><p style=\"text-align: left; text-indent: 37px;\"><span style=\"font-size: 14px;\"><span style=\"line-height: 33px;\"><span style=\"font-family: Calibri,sans-serif;\"><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\">由于受地質(zhì)構(gòu)造影響強烈,次級構(gòu)造(包括隧道掌子面揭露的小構(gòu)造)發(fā)育,軟質(zhì)巖(如絹云千枚巖)內(nèi)還發(fā)育多條韌性剪切破碎帶,隧道在掘進過程中不可避免地會遇到圍巖斷裂,褶曲等局部的小構(gòu)造,而正是這些局部的小構(gòu)造致使掌子面掘進工作中產(chǎn)生坍塌、冒落、涌水等地質(zhì)災害,嚴重威脅安全生產(chǎn)和隧道正常掘進;在隧道掌子面出現(xiàn)的小構(gòu)造,有的可以看到全貌;有的只能看到局部,但它們都對隧道掘進造成了安全威脅并影響掘進速度,下面以實際案例作詳細闡述。</span></span></span></span></span></p><p style=\"text-align: left; text-indent: 28px;\"><span style=\"font-size: 14px;\"><span style=\"line-height: 33px;\"><span style=\"font-family: Calibri,sans-serif;\"><strong><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\">路基25合同段杏樹山隧道進口左、右洞</span></span></strong><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\">:在掘進過程中,先后遇到斷層,褶曲等地質(zhì)構(gòu)造(見照片),致圍巖(以灰-灰黑色薄層狀絹云千枚巖為主夾少量脈狀和團塊狀石英巖)呈破碎-較破碎,局部極破碎,巖體出現(xiàn)擾曲扭曲變形,無自穩(wěn)能力;掌子面出現(xiàn)圍巖坍塌、冒落,地下水增大加快軟化圍巖等現(xiàn)象,嚴重威脅施工安全,無法正常掘進;經(jīng)業(yè)主代表,監(jiān)理,設計代表,項目部人員現(xiàn)場觀察后確定:變更襯砌類型,提高支護強度,加強超前支護(變單層小導管為雙層小導管),以“短進尺,弱爆破”等手段通過小構(gòu)造影響破壞等不良地質(zhì)帶。</span></span></span></span></span></p><p style=\"text-align: left; text-indent: 28px;\"><span style=\"font-size: 14px;\"><span style=\"line-height: 33px;\"><span style=\"font-family: Calibri,sans-serif;\"><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\"> </span></span></span></span></span></p><p style=\"text-align: center;\"><img title=\"1599613930808825.jpg\" alt=\"1.jpg\" src=\"//public/uploads/ueditor/image/20200909/A-8/1599613930808825.jpg\"/></p><p style=\"text-align: left; text-indent: 28px;\"><br/></p><p style=\"text-align: center;\"><img title=\"1599613965135705.jpg\" src=\"/Uploads/ueditor/image/20200909/A-8/1599613965135705.jpg\"/></p><p style=\"text-align: center;\"><img title=\"1599613965140287.jpg\" src=\"/Uploads/ueditor/image/20200909/A-8/1599613965140287.jpg\"/></p><p style=\"text-align: center;\"><img title=\"1599613965381132.jpg\" src=\"/Uploads/ueditor/image/20200909/A-8/1599613965381132.jpg\"/></p><p style=\"text-align: left; text-indent: 28px;\"><span style=\"font-size: 14px;\"><span style=\"line-height: 33px;\"><span style=\"font-family: Calibri,sans-serif;\"><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\"><br/></span></span></span></span></span></p><p style=\"line-height: 33px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px; font-style: normal; font-weight: normal;\"><span style=\"font-family: 仿宋;\"> 三圣廟隧道出口左洞</span></span><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><span style=\"font-family: 仿宋;\">:在隧道掘進至</span>ZK169+476-ZK169+466處,掌子面圍巖(灰-深灰色薄-中厚層狀絹云千枚巖)發(fā)生大面積坍塌、冒落且伴有點滴-線流狀地下水流出,無法安全施工,進度受阻;其原因就是隧道近鄰龍門山中央斷裂帶,隧道附近主要有高莊復向斜和轎子頂復背斜,受構(gòu)造影響強烈,圍巖受構(gòu)造擠壓產(chǎn)生褶曲、離層,圍巖整體性極差,多呈碎裂狀,巖體無自穩(wěn)能力(見下圖);應對措施:為了保證安全施工,盡量減少坍塌,決定采取“短進尺,弱爆破”的方法繼續(xù)掘進,同時將原設計襯砌類型X5c變更為X5b,超前支護由單層超前注漿小導管變更為雙層超前注漿小導管,此舉一是加強初支強度,二是加強超前支護,以應對地下水軟化圍巖而造成圍巖離層坍塌。(注:現(xiàn)場圍巖情況與超前地質(zhì)預報[HSP第2020-02期]中預報的有“軟弱破碎帶發(fā)育及可能有地下水出露,開挖時易存在掉塊、滑塌風險”基本吻合。)</span></p><p style=\"line-height: 33px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><br/></span></p><p style=\"text-align: center;\"><img title=\"1599614018599518.jpg\" src=\"/Uploads/ueditor/image/20200909/A-8/1599614018599518.jpg\"/></p><p style=\"text-align: center;\"><img title=\"1599614018131543.jpg\" src=\"/Uploads/ueditor/image/20200909/A-8/1599614018131543.jpg\"/></p><p style=\"padding: 0px; text-align: left; line-height: 33px; text-indent: 28px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px; font-style: normal; font-weight: normal;\"><span style=\"font-family: 仿宋;\">平南隧道出口右洞</span></span><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><span style=\"font-family: 仿宋;\">:</span>2020年8月8日平南隧道出口右洞掌子面發(fā)生坍塌,打垮鋼拱架多榀,垮塌的鋼拱架壓在打鉆臺車上,致臺車無法移出。(見下圖)。坍塌現(xiàn)場情況:從掌子面拱頂中部至掌子面右側(cè)伴隨巖塊冒落地下水呈小股狀流出,掌子面右側(cè)拱頂局部坍塌,形成高4.5m,寬4m,深6m的V字形塌腔。坍塌原因分析:(1)隧址區(qū)發(fā)育有兩條斷層和兩條韌性剪切破碎帶:F23、F24;E12、E13;巖體在構(gòu)造擠壓作用下,層間發(fā)生摩擦,在巖體表面可見檫痕,(2)爆破產(chǎn)生的裂隙溝通地下水水力通道,致掌子面地下水增大;(3)掌子面圍巖以灰-灰綠色薄層狀絹云千枚巖為主,夾有少量灰色薄-中厚層狀泥質(zhì)灰?guī)r;圍巖節(jié)理裂隙發(fā)育,圍巖整體性極差,無自穩(wěn)能力,(4)地下水侵蝕加快圍巖軟化、離層,最后在施工(人為擾動)時產(chǎn)生坍塌。</span></p><p style=\"padding: 0px; text-align: left; line-height: 33px; text-indent: 37px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><span style=\"font-family: 仿宋;\">應對措施;(</span>1)掌子面暫停施工,待坍塌結(jié)束,圍巖穩(wěn)定后再行處理。(2)K177+172.2—K177+169.2段已施工初期支護進行拆除。K177+172—K177+162段支護類型由原設計Z4b(I16工字鋼,間距1m)變更為Z5b(I18b工字鋼,間距0.6m),超前支護變更為70根雙層φ42*4mm注漿小導,管,縱向間距1.2m,并在塌腔位置預留2根注漿管,待該段初支完畢后在初支背面泵送1m深的C25混凝土。</span></p><p style=\"padding: 0px; text-align: left; line-height: 33px; text-indent: 28px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px; font-style: normal; font-weight: normal;\"><span style=\"font-family: 仿宋;\">結(jié)論:</span></span><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><span style=\"font-family: 仿宋;\">通過上述三個案例的分析,可以得出以下結(jié)論:</span></span></p><p style=\"padding: 0px; text-align: left; color: rgb(0, 0, 0); line-height: 33px; font-family: 微軟雅黑; font-size: 12px; font-style: normal; font-weight: normal; margin-top: 0px; margin-bottom: 0px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><span style=\"font-family: 仿宋;\"> 1、由于綿九高速公路線路橫跨龍門山構(gòu)造帶,受構(gòu)造影響強烈;隧道掘進過程中必然會遇到次級構(gòu)造(小構(gòu)造)的影響,隧道內(nèi)存在斷層褶曲及韌性剪切破碎帶,對隧道安全順利掘進會產(chǎn)生較大的影響;</span></span></p><p style=\"padding: 0px; text-align: left; color: rgb(0, 0, 0); line-height: 33px; font-family: 微軟雅黑; font-size: 12px; font-style: normal; font-weight: normal; margin-top: 0px; margin-bottom: 0px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><span style=\"font-family: 仿宋;\"> 2、進施工安全的影響,積極應對,主動避險;在施工過程中注意觀察圍巖變化,根據(jù)圍巖變化情況及時調(diào)整襯砌類型,加強超前支護;</span></span></p><p style=\"padding: 0px; text-align: left; color: rgb(0, 0, 0); line-height: 33px; font-family: 微軟雅黑; font-size: 12px; font-style: normal; font-weight: normal; margin-top: 0px; margin-bottom: 0px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><span style=\"font-family: 仿宋;\">加強超前地質(zhì)預報,加強監(jiān)控量測,為隧道掘進提供技術(shù)支撐;</span></span></p><p style=\"padding: 0px; text-align: left; color: rgb(0, 0, 0); line-height: 33px; font-family: 微軟雅黑; font-size: 12px; font-style: normal; font-weight: normal; margin-top: 0px; margin-bottom: 0px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><span style=\"font-family: 仿宋;\"> 3、施工部門要認真學習、重視超前地質(zhì)預報提供的信息,充分發(fā)揮地質(zhì)預報對隧道掘進的指導作用,及時與預報部門溝通聯(lián)系,從而達到安全順利施工的目的。</span></span></p><p style=\"line-height: 33px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"> </span></p><p style=\"line-height: 33px; -ms-text-autospace: ideograph-numeric;\"><span style=\"color: rgb(51, 51, 51); font-family: 仿宋; font-size: 19px;\"><br/></span></p><p style=\"text-align: left; text-indent: 28px;\"><span style=\"font-size: 14px;\"><span style=\"line-height: 33px;\"><span style=\"font-family: Calibri,sans-serif;\"><span style=\"font-size: 19px;\"><span style=\"font-family: 仿宋_GB2312;\"><br/></span></span></span></span></span></p><p style=\"text-align: left; text-indent: 28px;\"><br/></p><p></p>","orderBy":null,"status":0,"pv":2077,"link":null,"createdAt":"2020-09-09 09:14:57","updatedAt":"2025-10-21 12:58:13","department":null,"field":{},"tags":[]}

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