广清城际铁路清远站商业开发项目岩溶发育特征及工程措施
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摘要
为了解决广清城际铁路清远站某商业开发项目拟建场地内岩溶发育给建筑地基设计和施工带来的困难,通过详细的施工勘察,对场地地基稳定性分区、桩基选型、嵌岩深度和岩溶处理措施等问题进行了分析和总结。研究结果表明,拟建场地内岩溶整体发育程度为微-中等,Ⅱ区和Ⅳ区钻孔线岩溶率低于1%,属于岩溶稳定区;Ⅰ区和Ⅲ区钻孔线岩溶率均超过5%,属于岩溶不稳定区域。经计算,嵌岩桩入岩1. 5倍桩径可满足承载力要求(基岩面起伏大的地段需适当加深)。施工期间的岩溶处理宜采取回填、钢护筒跟进、注浆等方法。
In order to solve the difficulty in foundation design and construction brought by covered karst in commercial projects of Qingyuan Railway Station,research on division of karst area foundation stability,pile foundation selection,rock-socketed depth and treatment measures for karst has been conducted through construction geological survey. The results show that Ⅱ and Ⅳ area of proposed building site whose karst development degree is low-medium with a line karst rate less than 1%,belong to stable zone of karst,whereasⅠ and Ⅲ area with karst rate more than 5% develop to high karst degree and belong to unstable zone of karst.The calculation result also shows that pile foundation could maintain stability if piles are embedded into rock by 1. 5 times pile diameter and more in some complex situations. Besides,the karst treatments during construction period should include backfilling,pile casing and grouting.
In order to solve the difficulty in foundation design and construction brought by covered karst in commercial projects of Qingyuan Railway Station,research on division of karst area foundation stability,pile foundation selection,rock-socketed depth and treatment measures for karst has been conducted through construction geological survey. The results show that Ⅱ and Ⅳ area of proposed building site whose karst development degree is low-medium with a line karst rate less than 1%,belong to stable zone of karst,whereasⅠ and Ⅲ area with karst rate more than 5% develop to high karst degree and belong to unstable zone of karst.The calculation result also shows that pile foundation could maintain stability if piles are embedded into rock by 1. 5 times pile diameter and more in some complex situations. Besides,the karst treatments during construction period should include backfilling,pile casing and grouting.
引文
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[2]郭纯青,李志宇,杨军,等.云南某工程建设场地岩溶分布与形成机制[J].地质与勘探,2015,51(5):984-992.
[3]尹国荣.岩溶区勘察方法及桥梁桩基施工技术[D].长沙:中南大学,2009.
[4]王荣华.岩溶区桥梁桩基勘察与设计要点分析[J].铁道工程学报,2012,29(9):53-58.
[5]王喜迁,孙明国,张皓,等.高密度电法在岩溶探测中的应用[J].煤田地质与勘探,2011,39(5):72-75.
[6]唐毅.电测深法在南广铁路岩溶注浆效果检测中的应用分析[D].成都:西南交通大学,2010.
[7]方云飞,孙宏伟,阚敦莉.唐山岩溶地区桩基工程问题分析与设计要点[J].岩土工程学报,2013,35(S2):1117-1121.
[8]化建新,郑建国,王笃礼,等.工程地质手册(第五版)[M].北京:中国建筑工业出版社,2018.
[9]中国建筑科学研究院.JGJ 94—2008建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.
[10]于江龙.岩溶地基岩土工程勘察及地基处理分析[J].建材与装饰,2016(44):225-226.
[11]石振明,沈丹祎,彭铭,等.岩溶地区桩基施工溶洞处理技术—以吉安永和大桥桩基施工为例[J].工程地质学报,2015,23(6):1160-1167.
[12]李铭鹏.覆盖型岩溶地基基础处理方法的探索[D].深圳:深圳大学,2017.
[13]于春磊.覆盖型岩溶地基勘察与治理研究[D].唐山:华北理工大学,2017.
[14]王林成.铁路路基岩溶注浆处理施工技术总结[J].中国标准化,2018(8):74-76.
[15]张健,李术才,张乾青,等.覆盖型岩溶地基注浆处理与效果检测分析[J].建筑结构学报,2017,38(9):167-173.
[16]白丁伟,马建林,李兴国,等.高速铁路岩溶地区桩基后压浆试验研究[J].铁道标准设计,2018(6):83-88.