岩溶发育地区摩擦失效嵌岩桩施工过程病害处治技术
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摘要
随着城市的发展,基础设施向着城市边缘延伸,从而在建设中不可避免地会遇到岩溶发育地区。在复杂岩溶地区,特别是存在串珠式溶洞、裂隙节理高度发育的地区进行桩基的施工,常伴随着钻进困难、塌孔、漏浆、潜在滑动面滑动和钢护筒变形病害等问题。结合施工中所遇到的工程难题,采用超前钻预注浆维护基坑稳定;采用部分摩擦失效钻孔灌注嵌岩桩解决潜在滑动面的安全隐患;采用双层隔离钢护筒处治技术解决钢护筒变形的问题;针对大粒径成渣发明了改良气举法清孔排渣工艺,能为日后在岩溶地区施工中遇到的类似问题提供借鉴。
The city's infrastructure extends to the edge of the city with the development of the city,Thus karst areas inevitably encounter in the development of Construction activities. In complex karst areas,In particular,the existence of beaded cave,fracture joints highly developed areas,the pile foundation constructions often accompany with drilling difficulties,collapse holes,leakage of plasma,the potential slip surface sliding and steel casing deformation and other issues. This article combines the engineering problems encountered in the construction,we use advanced drilling pre-grouting to envelope pit stabilization; We adopt the bored pile with lateral friction resistance to solve the potential safety hazard of the sliding surface; The use of double steel casing treatment technology solve the problem of steel casing deformation; We invented an improved Gas-Lift-Method to clear away large size stones. It can provide reference for the similar problems encountered in the construction of karst areas in the future.
The city's infrastructure extends to the edge of the city with the development of the city,Thus karst areas inevitably encounter in the development of Construction activities. In complex karst areas,In particular,the existence of beaded cave,fracture joints highly developed areas,the pile foundation constructions often accompany with drilling difficulties,collapse holes,leakage of plasma,the potential slip surface sliding and steel casing deformation and other issues. This article combines the engineering problems encountered in the construction,we use advanced drilling pre-grouting to envelope pit stabilization; We adopt the bored pile with lateral friction resistance to solve the potential safety hazard of the sliding surface; The use of double steel casing treatment technology solve the problem of steel casing deformation; We invented an improved Gas-Lift-Method to clear away large size stones. It can provide reference for the similar problems encountered in the construction of karst areas in the future.
引文
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[2]李军伟.钢护筒跟进法桩基施工技术在复杂岩溶地质条件下的应用[J].施工技术,2015,44(7).
[3]张占彪,潘军.典型岩溶地质钻孔桩施工方法[J].铁道标准设计,2007(8):96-98.
[4]冷廷.深基坑注浆止水帷幕施工方法[J].黑龙江科技信息,2012(21):266.
[5]冯忠居,黄安录.钻孔灌注摩擦桩承载力的研究[J].工程力学,2000:323-324.
[6]姜晨光,Xiaolin Bai,巩亮生,石伟南.摩擦桩单桩竖向承载力计算方法[J].辽宁工程技术大学学报(自然科学版),2008(5).
[7]黄艳军.预注浆加固处理在路基岩溶地质条件下的应用[J].四川水利,2014.
[8]刘静霞.复杂岩溶区桩基施工预注浆处理及混凝土二次封底技术探讨[J].四川建材,2013(2).
[9]李春景,刘爱娟.岩溶地区大直径钻孔桩施工技术[J].世界桥梁,2006(2).
[10]张海亮.原位深孔注浆在岩溶地区钻孔桩施工中的应用[J].铁道标准设计,2009(7).
[11]刘泉声,卢超波,卢海峰,刘学伟.断层破碎带深部区域地表预注浆加固应用与分析[J].岩石力学与工程学报,2013(07).
[12]朱晓健.气举反循环在钻孔灌注桩二次清孔中的应用,[J].考试周刊,2010(21):1673-8918.
[13]周曙春,杜坤乾,谢军.正循环钻进、气举反循环清孔工艺施工应用,[J].岩土工程学.
[14]沈栋栋.气举法处理桥桩埋钻事故[J].岩土钻掘工程,2000(6):1000-3746.