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【十坑九漏】超大超深基坑滲漏處理技術

發布日期:2018-05-07 作者: 點擊:

一、基坑滲漏原因調查

BENGONGCHENGYOUSIZUOTALOUJISHANGYEQUNLOUZUCHENG,ZUIGAOJIANZHUGAODU328MI,ZHENGTISHESANCENGDIXIASHI。JIKENGMIANJIYUE4WANPINGFANGMI,JIKENGKAIWASHENDU18.2MI~21.2MI。JIKENGZHOUBIANHUANJINGFUZA。

本工程基坑在第三道支撐梁處土質為砂性粉土,土層深度在-9.5m~-13.5m,內含微承壓水,此部區域為基坑滲漏高發區。本工程土方開挖階段該層土層內止水帷幕出現滲水、漏水現象,根據其產生原因不同,可分為以下2個方面:

1、樁間滲水:

表現形式為:万丰国际赌场app下载圍護樁間出現輕微濕跡,或出現輕微滲水現象,但水量較小,水壓不大且滲水清澈不附帶泥沙(見圖1)。

此種滲漏產生原因為万丰国际赌场app下载圍護樁施工時,由于土層變化大、施工操作不當等原因造成局部圍護樁樁間距離過大,造成(1)層雜土層部分潛水含水層滲漏或止水帷幕與圍護樁之間的樁間積水滲漏,造成樁間土體脫落,形成較大的孔洞,圍護樁與止水帷幕之間距離較近,孔洞較大時(≥400mm)圍護樁將無法對止水帷幕進行有效支撐,由于止水帷幕為水泥土攪拌樁,有變形就會出現斷裂、漏水,對基坑安全帶來安全隱患。

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圖1 樁間滲水

2、止水帷幕滲漏

表現形式為:万丰国际赌场app下载圍護樁間發生接縫滲水,水量較大,并夾雜泥沙,且滲水帶有明顯的承壓性(見圖2)。

此種滲漏產生的原因為万丰国际赌场app下载止水帷幕在施工過程中形成冷縫,但未對其采取相應的加固措施;或止水帷幕施工過程中遇到障礙使孔位發生了偏移導致樁位間沒有形成很好的連接。至使(3-3)層的弱承壓水穿透止水帷幕,沿維護樁之間接縫滲出。由于(3-3)層為粉土,韌性低,干強度低,土體遇水后土的結構迅速破壞。一旦發生漏水,土便會伴隨著水一起流出,不但嚴重影響了施工進度,而且此類滲漏導致基坑外圍(3-3)層土體大量流失,如漏點不能及時封堵,會造成將基坑周圍土體沉降,對周邊建筑物的穩定性造成嚴重影響。

万丰国际赌场app下载TUFANGKAIWAQIANKETONGGUOJIANGSHUIJILUDUIZHISHUIWEIMUSHENLOUWEIZHIJINXINGYUPAN,JIKENGNEIBUJINGGUOJIANGSHUISHIGONGHOU,MOUXIEQUYUNEIDESHUIWEIHUISHENGSUDUYUANYUANKUAIYUQITABUWEI,CIBUFENQUYUWEIZHISHUIWEIMUSHENLOUGAOFAQUYU,KAIWAQIANXUZUOHAOLOUDIANFENGDUZHUNBEI。

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圖2 止水帷幕滲漏

二、滲漏處理措施

2.1、"支模封堵法"堵漏

万丰国际赌场app下载ZHUANGJIANSHENSHUIKECAIYONG"ZHIMOFENGDUFA"FAJINXINGFENGDU:

万丰国际赌场app下载ZAIWEIHUZHUANGZHONGXINPIANWAIWEIZHICHUJIANGWEIHUZHUANGDEGUJINJUBUTIZAOCHULAI(HUOZAIZHUANGSHANGDAKONGZHIGANGJIN),ZHUANGJIANSHEZHIφ12@200DANCENGGANGJINWANGPIAN(JIANTU3),SHENLOUDIANGAODU3mYIXIADECAIYONGMUMOBANZAIWAICEJINXINGDANCEZHIMO。LOUDIANGAODUDAYU3mDECAIYONGPENSHEC20XISHITONGFENGDU(JIANTU4),TONGQIANGDUDADAOYAOQIUHOUJIANGMOBANCHAICHU(JIANTU5)。

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圖5 混凝土澆筑完畢

2.2、"內堵法"堵漏

ZHISHUIWEIMUSHENLOUDANLOUSHUILIANGBUDAQIEJIADAISHAOLIANGNISHASHI,KECAIYONG"NEIDU"DEFANGFAJINXINGFENGDU:

万丰国际赌场app下载1、LOUDIANCHULI:QINGCHULOUSHUIBUWEIWEIHUZHUANGJIANDENITUHEZAZHI,JIANGSHENLOUCHUZAOCHENGFANXIEXINGKONGDONG,LIANGCEZAODAOWEIHUZHUANGBIAN,JIANGWEIHUZHUANGBIAOMIANNITUQINGLIGANJING。

2、BANZHISHUINI:KUAISUDULOUBIXUXUANYONG"SHUANGKUAISUNINGSHUINI",JIANGSHUINIYUSHUIAN1:0.2DEBILIFANFUROUNIECHENGTUAN,FENGKOUSHIANSHUINI:SHUI=1:0.3JIAOBANCHENGJUNYUNDENIZIZHUANG,SHUANGKUAISHUINICHUNINGSHIJIANWEI0.2h,ZHONGNINGSHIJIAN1.5h。

万丰国际赌场app下载3、SAIRUTIANCHONGWU:RUFENGXIZHONGNISHALIUSHIJIAODUO,NEIBUCHUXIANJIAODAKONGDONGSHI,JIANGJIUMIANXUHUOPOBUSAIRUKONGDONGNEI,JIUMIANXUHUOPOBUJIKEYIZUZHINISHALIUSHIFANGZHIKONGDONGKUODA,YOUKEYITOUSHUI。

万丰国际赌场app下载4、CHARUDAOGUAN:ZAIXIEXINGKONGDONGDIBUJIANGBANZHIHAODESHUINIPINGPUYICENG,HOUDUYUEWEIKONGDONGDESANFENZHIYI,KUAISUJIANGSHIXIANZHUNBEIHAODECHANGDUYUE1.5mDEΦ25SULIAOGUAN(GUANJINGGENJULOUDIANSHUILIULIANGDIAOZHENG)YIDUANCHARUDAOLOUSHUIDIANSHENCHU,JIANGSHUIGUANYARUPINGPUDESHUININEI,QUERENLOUSHUIDIANSHUILIUCONGGUANNEILIUZOUSHIJIXUPUBANZHIHAODESHUINIGUDINGDAOSHUIGUAN,JIANTU6。

圖5 混凝土澆筑完畢

2.2、"內堵法"堵漏

ZHISHUIWEIMUSHENLOUDANLOUSHUILIANGBUDAQIEJIADAISHAOLIANGNISHASHI,KECAIYONG"NEIDU"DEFANGFAJINXINGFENGDU:

1、LOUDIANCHULI:QINGCHULOUSHUIBUWEIWEIHUZHUANGJIANDENITUHEZAZHI,JIANGSHENLOUCHUZAOCHENGFANXIEXINGKONGDONG,LIANGCEZAODAOWEIHUZHUANGBIAN,JIANGWEIHUZHUANGBIAOMIANNITUQINGLIGANJING。

万丰国际赌场app下载2、BANZHISHUINI:KUAISUDULOUBIXUXUANYONG"SHUANGKUAISUNINGSHUINI",JIANGSHUINIYUSHUIAN1:0.2DEBILIFANFUROUNIECHENGTUAN,FENGKOUSHIANSHUINI:SHUI=1:0.3JIAOBANCHENGJUNYUNDENIZIZHUANG,SHUANGKUAISHUINICHUNINGSHIJIANWEI0.2h,ZHONGNINGSHIJIAN1.5h。

3、SAIRUTIANCHONGWU:RUFENGXIZHONGNISHALIUSHIJIAODUO,NEIBUCHUXIANJIAODAKONGDONGSHI,JIANGJIUMIANXUHUOPOBUSAIRUKONGDONGNEI,JIUMIANXUHUOPOBUJIKEYIZUZHINISHALIUSHIFANGZHIKONGDONGKUODA,YOUKEYITOUSHUI。

万丰国际赌场app下载4、CHARUDAOGUAN:ZAIXIEXINGKONGDONGDIBUJIANGBANZHIHAODESHUINIPINGPUYICENG,HOUDUYUEWEIKONGDONGDESANFENZHIYI,KUAISUJIANGSHIXIANZHUNBEIHAODECHANGDUYUE1.5mDEΦ25SULIAOGUAN(GUANJINGGENJULOUDIANSHUILIULIANGDIAOZHENG)YIDUANCHARUDAOLOUSHUIDIANSHENCHU,JIANGSHUIGUANYARUPINGPUDESHUININEI,QUERENLOUSHUIDIANSHUILIUCONGGUANNEILIUZOUSHIJIXUPUBANZHIHAODESHUINIGUDINGDAOSHUIGUAN,JIANTU6。

 

5、FENGZHULOUSHUIKOU:JIANGBANHAODESHUINITUANXUNSUSAIJINSHENSHUIKOU,JIANGCHARUDEDAOSHUIGUANZHOUWEIQUANBUYONGSHUINITUANFENGZHU。QUERENLOUSHUIQUANBUYOUDAOSHUIGUANPAICHUQITABUWEIBUZAISHENSHUIHOU,ZAIKONGDONGZHOUWEIYANCHU10cmDEFANWEIZAIGUAYAYICENG,RUGUOLIUSHUIYALIJIAODASHI,KECAIQUZAIWEIHUZHUANGDAPENGZHANGLUOSIJIAGANGJINWANGJINXINGJIAGU,GUDINGHAODAOGUANHOUZAIDAOGUANDUANBUSAIRULVWANGGUOLVNISHA,BAOZHENGGUANNEIZHILIUSHUIBUDAIZOUNISHA。

万丰国际赌场app下载6、YANGHU:YANGHUBUXIAOYU4hXIAOSHI,RUTIANQIYANRE,SHIDANGPENSHUIYANGHU

7、扎管止水:待水泥硬化滿足強度(20MPa以上)要求后,將塑料導水管用鉛絲扎死止水。有時由于水壓力較大,扎管后水可能從其他部位滲漏出來,依照上述方法重新進行引流封堵直至堵為止

2.3、"外封法"堵漏

ZHISHUIWEIMUSHENLOUQIELOUSHUILIANGJIAODAQIEJIADAINISHASHI,BIXUCAIYONG"WAIFENG"DEFANGFAJINXINGFENGDU,JUTIZUOFARUXIA:

万丰国际赌场app下载1、ZAIJIKENGNEICEZHAODAOLOUSHUIYUANTOU,QINGLILOUSHUIDIANLICEJIKONGDONGZHOUBIAN,XIUWASHIBASHENLOUDIANWACHENGLIDAWAIXIAODEXINGSHI,BIANYUANZHUANGGANHAIDAIDENGPENGZHANGCAILIAO,TONGSHITIANSAIMIANXUJIANXIAOLOUSHUIZHONGXIEDAIDENISHA。

2、HUITIANZUOWEIYAN:DUILOUDIANXUNSUHUITIANTUZUOWEIYAN,YANZHONGLOUSHUISHIJIAOZHUTONGZUOWEIYAN,JIANSHAOLOUSHUIDUIJIKENGDEPOHUAI。

万丰国际赌场app下载3、ZHANJINCHENGKONG:CAIYONGQICHEDIAOJIANGZHANJIZAILOUSHUIDIANCHUJIUWEI,DIAOZHENGHAOCHUIZHIDUHOUKAISHIZHANKONG,ZHANKONGSHENDUWEILOUSHUIDIANXIA1mZUOYOU,ZHANKONGJIANTU9SUOSHI。

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万丰国际赌场app下载4、ANFANGZHUJIANGGUAN:ZHANDAOSHENDUHOUTISHENGZHANGAN,ANFANGZHUJIANGGUAN(φ25DUXINGUAN),ANFANGZHUJIANGGUANGUOCHENGZHONGRUYUDAOSHATUCENGCHUXIANZHANKONGTAFANG,CAIYONGGAIZHUANGDEPINGBANZHENDAOQIJIANGZHUJIANGGUANYARUYUDINGSHENDU,ZAIZHUJIANGGUANSHANGLIANJIEDAIYOULIANGGEFAMENDESANTONG,FENBIEYONGLAILIANJIESHUINIZHUJIANGBENGHESHUIBOLIZHUJIANGBENG。

万丰国际赌场app下载5、ZHUSHUINIJIANG:ANZHAOSHUIHUIBI0.7:1JIAOBANSHUINIJIANG,XIANZHURUSHUINIJIANGQUERENZHUJIANGGUANSHIFOUZAILOUSHUITONGDAOFUJIN,RUZHUJIANGGUOCHENGZHONGCHIXUZHUJIANGWEILIUCHUSHUINIJIANG,KESHIDANGTISHENGZHUJIANGGUAN15~20cm,LOUSHUIDIANLIUCHUSHUINIJIANGHOUCAINENGQUERENZHAODAOLOUSHUITONGDAO。

6、SHUANGYEZHUJIANG:SHUANGYEZHUJIANGSHIJINGYAZHUJIANGZHONGDEYIZHONG,JILIYONGYEYATONGGUOZHUJIANGGUANBASHUINIRONGYEHESHUIBOLIDUANSHIJIANNEIHUNHEJUNYUNSHENGCHENGSHUINIJIAO,RANHOUZHURUDICENGZHONG。LIYONGSHUINIJIAONINGJIESUDUKUAI,QIANGDUTIGAOKUAIDETEDIANFENGDUSHENLOUTONGDAO,DADAODULOUMUDE。

万丰国际赌场app下载SHUINIDESHUIJIECHANWUCa(OH)YUSHUIBOLIXIANGYUXUNSUJIEHECHENGYIZHONGSHUINIJIAOZHUANGTI,QIFANYINGJILI:

Na2O·nSiO2+Ca(OH)2+mH2O-CaO·nSiO2·mH2O+2NaOH

(1)CAILIAO:SHUIBOLI(BOMEIDU35~40),MOSHU3.0~3.4;PUTONGGUISUANYANSHUINI,PO42.5,SHUINIJIANGYESHUIHUIBIWEI0.7:1。

(2)ZHENGSHISHUANGYEZHUJIANGQIANYINGJINXINGSHIPEI,YIQUEDINGSHUANGYENENGFOUZAI30sNEININGGU,PEIZHIDESHUINI、SHUIBOLIJIANGYEBIZHONGYINGWEI1:1。

万丰国际赌场app下载(3)ZHUJIANGSHIXIANZHURUSHUINIJIANG,QUERENCHUSHUIKOUCHUSHUINIJIANGCHIXUBUDUANLIUCHUHOUTONGSHIKAIBENGZHURUSHUIBOLI,LIANGZHONGJIANGYEZAIYXINGGUANZHONGDUANNEIHUNHE,DULOUSHIZHUJIANGYALIZAI0.5~1MPa,LIANGGEZHUJIANGBENGYITONGYIBENGYAZHUSHE,ZHUJIANGJIANTU10SUOSHI。

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万丰国际赌场app下载4)LIUSHUIKOUCHUXIANZHANCHOUHUNHEJIANGYE、BANSUICHUXIANQIPAOSHI,JIYONGBIANZHIDAIFENGDUGANGGUANCHUSHUIKOUCHU,DENGLIUSHUILIANGZHUJIANBIANXIAOZHIZHITINGZHIHOU,TINGZHIZHUJIANG,GUANCHAlhHOUZAIJIXUZHUJIANG。

7、ZHUJIANGJIAGU:

(1)JINGYAZHUJIANG:LOUSHUIDIANDUZHUHOU24hHOUJINGYAZHUJIANGJIAGU,JIAGUDIANBUDIANYANZHISHUIWEIMUFANGXIANGJULIDULOUDIANZUOYOUGE0.5mWEIZHISHEZHIYIGEJIAGUDIAN,ZHUJIANGSHENDUWEILOUSHUIDIANXIA1m,LIULIANGWEI8~12L/min,JIAGUSHIZHUJIANGYALIZAI1~1.5MPaYISHANG。

(2)PILIEZHUJIANG:JINGYAZHUJIANGJIAGUSHI,YOUYUXIABUTUCENGMISHIDUDAJIANGYEBUYIKUOSAN,QIEZHUJIANGGUANYUZHANKONGZHIJIANKONGXIJIAODA,ZHUJIANGSHIFANJIANGYANZHONG,YINCICAIYONGPILIEZHUJIANG,ZHANKONGGUOCHENGZHONGZHURUTAOTUFENJIANGYERUNHUAZHANGAN、FANGZHIDUKONG,TONGSHIJIANSHAOFANGRUPILIEZHUJIANGGUANSHIDEZULI,FANGRUPILIEZHUJIANGGUANHOUZAIQISHANGBU1mCHUCAIYONGSHUINIJIANGJINXINGFENGDUMISHI,2TIANHOUZAIPILIEGUANNEICHARUZHUJIANGHUAGUAN,FENCENG(50cm)JINXINGZHUJIANG,ZHUJIANGYALIWEI2MPa,ZHIZHIZHUMANFANJIANGWEIZHI,PILIEZHUJIANGBUDIANPINGMIANWEIZHIJIZUOFAXIANGJIANTU11、12。


三、基坑漏點監測措施

JIKENGCHUXIANYANZHONGLOUSHUIDENGXIANQINGSHI,ZAILOUSHUIDIANBANJING50mFANWEINEIDEJIANCEDIANDANDUJIANLIJIANCEXITONG,DUIJIKENGSHENCENGSHUIPINGWEIYI、ZHIHUJIEGOUSHUIPINGWEIYI、ZHIHUJIEGOUCHUIZHIWEIYI、ZHICHENGZHOULI、ZHUANGSHENYINGLIJIQIZHOUBIANJIAN(GOU)ZHUWU、DAOLUDEDONGTAIBIANHUAJINXINGJIANCE,MEITIANSHANGWU、XIAWUGEGUANCEYICI,JISHIBAOGAOJIANCEJIEGUO,PAIZHUANMENRENYUAN24XIAOSHIZHIBAN,ZHIZHIXIANQINGJIESHU。


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