- 摘 要
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（1 廣州市高速公路有限公司, 廣州 510055； 2 廣州市廣園工程技術(shù)咨詢有限公司, 廣州 510055）
［摘要］橋梁樁基礎施工受地質(zhì)條件影響大，巖溶發(fā)育地區(qū)樁基施工尤為困難，如遇大型溶洞而處理方法不當，往往會造成掉鉆或卡錘、漏漿，甚至地面塌陷，危及周邊結(jié)構(gòu)物安全并造成人員傷亡，尤其在城鎮(zhèn)區(qū)域后果將更為嚴重。以位于城鎮(zhèn)區(qū)域某高速公路橋梁樁基施工中的一個大型溶洞處治方案為例，介紹原設計樁基溶洞處治方案，分析施工過程中發(fā)生坍塌的原因； 進而根據(jù)地質(zhì)補勘結(jié)果，提出相應的處治方案，并簡要介紹后續(xù)施工的注意事項； 總結(jié)出城鎮(zhèn)巖溶發(fā)育地區(qū)溶洞處治的相關(guān)注意事項及經(jīng)驗，可為其他同類項目提供參考。
［關(guān)鍵詞］橋梁工程； 城鎮(zhèn)區(qū)域； 巖溶發(fā)育地區(qū)； 地面塌陷； 溶洞樁基處治
中圖分類號：TU997文獻標識碼：A文章編號：1002-848X(2021)02-0137-06
Case study of karst cave collapse during pile foundation construction and scheme adjustment in urban area
LAO Guojian1, LU Yun2
(1 Guangzhou Highway Co., Ltd., Guangzhou 510055, China; 2 Guangzhou Guangyuan Engineering Technology Consulting Co., Ltd., Guangzhou 510055, China)
Abstract:The construction of bridge pile foundation is greatly affected by geological conditions, especially in karst cave development area. The improper treatment of large karst cave often causes dropping or sticking of drill bit, mud leakage, even ground collapse, which endanger the safety of surrounding buildings and people, particularly in urban areas. Taking treatment plan of a large karst cave in the pile foundation construction of a highway bridge in an urban area as an example, original design treatment plan of karst cave of the pile foundation was introduced, the reasons of collapse during the construction process were analyzed. Then the corresponding treatment plan was proposed according to the results of geological survey, the attention matters for the subsequent construction were briefly introduced. The relevant attention matters and experience in karst cave development area of urban were summarized, which can provide reference for other similar projects.
Keywords:bridge engineering; urban area; karst development area; ground collapse; treatment measures of karst cave pile foundation
作者簡介：老國健，在職碩士研究生，工程師，Email：lgjdunk@163.com。
