【摘要】：隨著現(xiàn)階段經濟的發(fā)展和科技的進步,高速公路的需求越來越多。隨著公路里程快速增加,在巖溶地區(qū)增加修建高速公路趨勢不可避免。本文主要是針對在巖溶發(fā)育地區(qū)的橋梁基礎施工,在施工過程中如何合理的解決溶洞地區(qū)樁基礎施工的重難點,確保樁基礎施工安全和施工質量。由于溶洞的樁基礎施工具有不可預見性、危險性,本文主要通過對溶洞樁基礎在施工過程中出現(xiàn)溶洞特征進行分析,結合高密度電法巖溶勘察手段對該巖溶區(qū)進行了初探,直觀的得出了巖溶區(qū)地質地貌特性,并進行了詳細分析。針對施工出現(xiàn)的問題進行調查分析,總結了巖溶區(qū)現(xiàn)場施工常見問題,探討了溶洞樁基礎在施工過程中采取的有效措施的合理性。為了達到溶洞樁基礎的最大經濟化,溶洞樁基礎施工前施工技術人員首先認真仔細閱設計圖紙及勘察資料等文件,弄清楚樁基礎溶洞、土洞的基本情況,對巖溶區(qū)橋梁基礎的施工工藝進行優(yōu)化,同時,加強施工過程中對地質變化的監(jiān)控,重點監(jiān)控泥漿的稠度、溶洞的層數(shù)及填充物形態(tài)等情況,做好詳細的鉆孔記錄,為出現(xiàn)異常情況時分析原因并選擇合適的處治方案提供依據(jù)。根據(jù)不同的地質異常選擇不同的處治方案,避免巖溶區(qū)樁基在施工過程中可能會出現(xiàn)斜樁、卡鉆、塌孔、擴孔、埋鉆,甚至斷樁等施工事故,為后期施工提供經驗借鑒。本文以廣東省二廣高速公路某大橋橋梁基礎設計與施工為對象,通過對國內外巖溶發(fā)育現(xiàn)狀和對工程設計與施工影響的分析,參考以往基礎施工技術、裝備、質量管理等成功經驗,結合現(xiàn)場沖孔巖樣及記錄,總結已施工的溶洞樁基處理經驗,分析所采用處理對策的適宜性。為復雜巖溶地區(qū)的基礎施工提供參考,為工程界的技術人員在該領域的研究與應用,在理論與實踐的結合上作了新的提示作用。
[Abstract]:With the development of economy and the progress of science and technology, the demand of freeway is more and more. With the rapid increase of highway mileage, it is inevitable to increase the construction of highway in karst area. This paper mainly aims at the bridge foundation construction in karst development area, how to reasonably solve the serious difficulties of pile foundation construction in karst cave area during the construction process, and ensure the construction safety and construction quality of pile foundation. Because the pile foundation construction of the karst cave is unpredictable and dangerous, this paper mainly analyzes the characteristics of the karst cave in the construction process of the karst cave pile foundation, and probes into the karst area with the means of high density electrical karst exploration. The geological and geomorphological characteristics of karst area are obtained intuitively and analyzed in detail. Based on the investigation and analysis of the problems in construction, this paper summarizes the common problems in the field construction in karst area, and probes into the rationality of effective measures taken in the construction process of the karst cave pile foundation. In order to achieve the maximum economic value of the karst cave pile foundation, the construction technicians first carefully read the design drawings and survey materials before the construction of the karst cave pile foundation, so as to find out the basic conditions of the karst cave and the earth tunnel of the pile foundation. To optimize the construction technology of bridge foundation in karst area, at the same time, to strengthen the monitoring of geological change in the construction process, to monitor the consistency of mud, the number of layers of cavern and the shape of fillers, etc., and to make detailed borehole records. It provides the basis for analyzing the cause and choosing the appropriate treatment plan when the abnormal situation occurs. According to different geological anomalies, different treatment schemes can be chosen to avoid inclined pile, drill jam, hole collapse, hole enlargement, burying drill and even broken pile during construction in karst area, which can provide experience for later construction. This paper takes the foundation design and construction of a bridge of Erguang Expressway in Guangdong Province as the object, through the analysis of the present situation of karst development at home and abroad and its influence on engineering design and construction, referring to the previous foundation construction technology and equipment. Based on the successful experience of quality management, combined with the samples and records of punched rock on the spot, the experience of pile foundation treatment of karst cave has been summarized, and the suitability of the treatment measures adopted is analyzed. It provides a reference for the foundation construction in complex karst areas, and provides a new hint for the research and application of the technicians in this field in the field of engineering and the combination of theory and practice.
【學位授予單位】：湖北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.551

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