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【十坑九漏】超大超深基坑渗漏处理技术

发布日期:2018-05-07 作者: 点击:

一、基坑渗漏原因调查

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

本工程基坑在第三道支撑梁处土质为砂性粉土,土层深度在-9.5m~-13.5m,内含微承压水QQ斗牛,此部区域为基坑渗漏高发区。本工程土方开挖阶段该层土层内止水帷幕出现渗水、漏水现象,根据其产生原因不同,可分为以下2个方面:

1、桩间渗水:

表现形式为:围护桩间出现轻微湿迹,或出现轻微渗水现象,但水量较小,水压不大且渗水清澈不附带泥沙(见图1)。

此种渗漏产生原因为QQ斗牛围护桩施工时,由于土层变化大、施工操作不当等原因造成局部围护桩桩间距离过大,造成(1)层杂土层部分潜水含水层渗漏或止水帷幕与围护桩之间的桩间积水渗漏,造成桩间土体脱落,形成较大的孔洞,围护桩与止水帷幕之间距离较近,孔洞较大时(≥400mm)围护桩将无法对止水帷幕进行有效支撑,由于止水帷幕为水泥土搅拌桩,有变形就会出现断裂、漏水,对基坑安全带来安全隐患。

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图1 桩间渗水

2、止水帷幕渗漏

表现形式为:围护桩间发生接缝渗水,水量较大,并夹杂泥沙,且渗水带有明显的承压性(见图2)。

此种渗漏产生的原因为QQ斗牛止水帷幕在施工过程中形成冷缝,但未对其采取相应的加固措施;或止水帷幕施工过程中遇到障碍使孔位发生了偏移导致桩位间没有形成很好的连接。至使(3-3)层的弱承压水穿透止水帷幕,沿维护桩之间接缝渗出。由于(3-3)层为粉土,韧性低,干强度低,土体遇水后土的结构迅速破坏。一旦发生漏水,土便会伴随着水一起流出,不但严重影响了施工进度,而且此类渗漏导致基坑外围(3-3)层土体大量流失,如漏点不能及时封堵,会造成将基坑周围土体沉降,对周边建筑物的稳定性造成严重影响。

TUFANGKAIWAQIANKETONGGUOJIANGSHUIJILUDUIZHISHUIWEIMUSHENLOUWEIZHIJINXINGYUPAN,JIKENGNEIBUJINGGUOJIANGSHUISHIGONGHOU,MOUXIEQUYUNEIDESHUIWEIHUISHENGSUDUYUANYUANKUAIYUQITABUWEI,CIBUFENQUYUWEIZHISHUIWEIMUSHENLOUGAOFAQUYU,KAIWAQIANXUZUOHAOLOUDIANFENGDUZHUNBEI。

8.jpg

图2 止水帷幕渗漏

二、渗漏处理措施

2.1、"支模封堵法"堵漏

ZHUANGJIANSHENSHUIKECAIYONG"ZHIMOFENGDUFA"FAJINXINGFENGDU:

QQ斗牛ZAIWEIHUZHUANGZHONGXINPIANWAIWEIZHICHUJIANGWEIHUZHUANGDEGUJINJUBUTIZAOCHULAI(HUOZAIZHUANGSHANGDAKONGZHIGANGJIN),ZHUANGJIANSHEZHIφ12@200DANCENGGANGJINWANGPIAN(JIANTU3),SHENLOUDIANGAODU3mYIXIADECAIYONGMUMOBANZAIWAICEJINXINGDANCEZHIMO。LOUDIANGAODUDAYU3mDECAIYONGPENSHEC20XISHITONGFENGDU(JIANTU4),TONGQIANGDUDADAOYAOQIUHOUJIANGMOBANCHAICHU(JIANTU5)。

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图5 混凝土浇筑完毕

2.2、"内堵法"堵漏

ZHISHUIWEIMUSHENLOUDANLOUSHUILIANGBUDAQIEJIADAISHAOLIANGNISHASHI,KECAIYONG"NEIDU"DEFANGFAJINXINGFENGDU:

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

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

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

4、CHARUDAOGUAN:ZAIXIEXINGKONGDONGDIBUJIANGBANZHIHAODESHUINIPINGPUYICENG,HOUDUYUEWEIKONGDONGDESANFENZHIYI,KUAISUJIANGSHIXIANZHUNBEIHAODEZHANGDUYUE1.5mDEΦ25SULIAOGUAN(GUANJINGGENJULOUDIANSHUILIULIANGDIAOZHENG)YIDUANCHARUDAOLOUSHUIDIANSHENCHU,JIANGSHUIGUANYARUPINGPUDESHUININEI,QUERENLOUSHUIDIANSHUILIUCONGGUANNEILIUZOUSHIJIXUPUBANZHIHAODESHUINIGUDINGDAOSHUIGUAN,JIANTU6。

图5 混凝土浇筑完毕

2.2、"内堵法"堵漏

ZHISHUIWEIMUSHENLOUDANLOUSHUILIANGBUDAQIEJIADAISHAOLIANGNISHASHI,KECAIYONG"NEIDU"DEFANGFAJINXINGFENGDU:

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

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

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

QQ斗牛4、CHARUDAOGUAN:ZAIXIEXINGKONGDONGDIBUJIANGBANZHIHAODESHUINIPINGPUYICENG,HOUDUYUEWEIKONGDONGDESANFENZHIYI,KUAISUJIANGSHIXIANZHUNBEIHAODEZHANGDUYUE1.5mDEΦ25SULIAOGUAN(GUANJINGGENJULOUDIANSHUILIULIANGDIAOZHENG)YIDUANCHARUDAOLOUSHUIDIANSHENCHU,JIANGSHUIGUANYARUPINGPUDESHUININEI,QUERENLOUSHUIDIANSHUILIUCONGGUANNEILIUZOUSHIJIXUPUBANZHIHAODESHUINIGUDINGDAOSHUIGUAN,JIANTU6。

 

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

QQ斗牛6、YANGHU:YANGHUBUXIAOYU4hXIAOSHI,RUTIANQIYANRE,SHIDANGPENSHUIYANGHU

7、扎管止水:待水泥硬化满足强度(20MPa以上)要求后,将塑料导水管用铅丝扎死止水。有时由于水压力较大,扎管后水可能从其他部位渗漏出来,依照上述方法重新进行引流封堵直至堵为止

2.3、"外封法"堵漏

QQ斗牛ZHISHUIWEIMUSHENLOUQIELOUSHUILIANGJIAODAQIEJIADAINISHASHI,BIXUCAIYONG"WAIFENG"DEFANGFAJINXINGFENGDU,JUTIZUOFARUXIA:

QQ斗牛1、ZAIJIKENGNEICEZHAODAOLOUSHUIYUANTOU,QINGLILOUSHUIDIANLICEJIKONGDONGZHOUBIAN,XIUWASHIBASHENLOUDIANWACHENGLIDAWAIXIAODEXINGSHI,BIANYUANZHUANGGANHAIDAIDENGPENGZHANGCAILIAO,TONGSHITIANSAIMIANXUJIANXIAOLOUSHUIZHONGXIEDAIDENISHA。

QQ斗牛2、HUITIANZUOWEIYAN:DUILOUDIANXUNSUHUITIANTUZUOWEIYAN,YANZHONGLOUSHUISHIJIAOZHUTONGZUOWEIYAN,JIANSHAOLOUSHUIDUIJIKENGDEPOHUAI。

3、ZUANJINCHENGKONG:CAIYONGQICHEDIAOJIANGZUANJIZAILOUSHUIDIANCHUJIUWEI,DIAOZHENGHAOCHUIZHIDUHOUKAISHIZUANKONG,ZUANKONGSHENDUWEILOUSHUIDIANXIA1mZUOYOU,ZUANKONGJIANTU9SUOSHI。

10.jpg

4、ANFANGZHUJIANGGUAN:ZUANDAOSHENDUHOUTISHENGZUANGAN,ANFANGZHUJIANGGUAN(φ25DUXINGUAN),ANFANGZHUJIANGGUANGUOCHENGZHONGRUYUDAOSHATUCENGCHUXIANZUANKONGTAFANG,CAIYONGGAIZHUANGDEPINGBANZHENDAOQIJIANGZHUJIANGGUANYARUYUDINGSHENDU,ZAIZHUJIANGGUANSHANGLIANJIEDAIYOULIANGGEFAMENDESANTONG,FENBIEYONGLAILIANJIESHUINIZHUJIANGBENGHESHUIBOLIZHUJIANGBENG。

QQ斗牛5、ZHUSHUINIJIANG:ANZHAOSHUIHUIBI0.7:1JIAOBANSHUINIJIANG,XIANZHURUSHUINIJIANGQUERENZHUJIANGGUANSHIFOUZAILOUSHUITONGDAOFUJIN,RUZHUJIANGGUOCHENGZHONGCHIXUZHUJIANGWEILIUCHUSHUINIJIANG,KESHIDANGTISHENGZHUJIANGGUAN15~20cm,LOUSHUIDIANLIUCHUSHUINIJIANGHOUCAINENGQUERENZHAODAOLOUSHUITONGDAO。

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

SHUINIDESHUIJIECHANWUCa(OH)YUSHUIBOLIXIANGYUXUNSUJIEHECHENGYIZHONGSHUINIJIAOZHUANGTI,QIFANYINGJILI:

QQ斗牛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。

(3)ZHUJIANGSHIXIANZHURUSHUINIJIANG,QUERENCHUSHUIKOUCHUSHUINIJIANGCHIXUBUDUANLIUCHUHOUTONGSHIKAIBENGZHURUSHUIBOLI,LIANGZHONGJIANGYEZAIYXINGGUANZHONGDUANNEIHUNHE,DULOUSHIZHUJIANGYALIZAI0.5~1MPa,LIANGGEZHUJIANGBENGYITONGYIBENGYAZHUSHE,ZHUJIANGJIANTU10SUOSHI。

11.jpg


QQ斗牛4)LIUSHUIKOUCHUXIANZHANCHOUHUNHEJIANGYE、BANSUICHUXIANQIPAOSHI,JIYONGBIANZHIDAIFENGDUGANGGUANCHUSHUIKOUCHU,DENGLIUSHUILIANGZHUJIANBIANXIAOZHIZHITINGZHIHOU,TINGZHIZHUJIANG,GUANCHAlhHOUZAIJIXUZHUJIANG。

7、ZHUJIANGJIAGU:

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

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


三、基坑漏点监测措施

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


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