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    汕頭市政府門戶網站 Shantou Municipal Government 頭部
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    汕頭海灣隧道西線預計8月貫通
    • 2020-05-27 10:28
    • 來源: 汕頭日報
    • 發布機構:汕頭市信息中心
    • 【字體:    

      繼汕頭海灣隧道東線貫通后,項目再次傳來喜訊——西線盾構掘進已攻克下第三段基巖凸起段,該段為東、西線盾構隧道六段基巖凸起中巖石強度最大、施工風險最高的一段!至此,東西線盾構機都安全順利地通過基巖凸段,開創了國內極硬極軟組合地層盾構直接掘進的先河。

      汕頭海灣隧道是國內第一座地處8度地震烈度帶的超大直徑越海盾構隧道,全長6.68公里,其中海底盾構施工段長度為3047.5米,分為東、西線兩座隧道。海灣隧道西線盾構機是首臺國產超大直徑泥水平衡盾構機,具有完全自主知識產權,與東線國外品牌盾構機同臺競技。盾構機在海灣隧道掘進過程面臨的最大難關——基巖段掘進時因上部土體極軟下方基巖極硬,強度差異大,盾構機很容易出現上漂的趨勢。因此,項目采用的具有常壓刀盤功能的泥水平衡盾構機,可以在常態氣壓情況下進行刀具抽檢更換。在軟土地層掘進時少裝切刀、多裝撕裂刀,提高掘進速度;在基巖凸起段時換掉撕裂刀、多裝滾刀。

      據汕頭海灣隧道項目部南岸工區土木副總李文玉介紹,西線隧道第三段基巖凸起長度達71.8米,巖石主要為中微風化花崗巖,地勘揭露巖石最高強度達216兆帕,是東、西線盾構隧道六段基巖凸起中巖石強度最大、施工風險最高的一段。為更有效應對超強硬巖,汕頭海灣隧道項目部根據西線基巖掘進實際情況,并結合東線盾構過基巖凸起段的經驗進行了一系列管理和技術上的探索創新。

      管理上,成立了以項目經理為組長的盾構基巖掘進施工管理領導小組,細化分工為專家咨詢層、決策層、分析反饋層、執行層四大管理層級,為攻堅克難提供全面保障。技術上,項目部以盾構及掘進技術國家重點實驗室的“智慧盾構TBM工程大數據平臺”為依托,指定專人24小時對渣樣中的巖石進行統計分析,實時掌握刀具破巖狀況,根據項目研發的掌子面聲音采集系統,在主控室內對中心錐破巖的聲波進一步分析,確定基巖起伏范圍,配置掘進參數分析員,按小時對掘進參數、刀具監測參數進行匹配分析,通過綜合這三項信息進行實時預警、提前預判,科學設定掘進參數,保證安全有序可控掘進。

      截至5月25日,西線盾構已累計掘進2414米,剩余632米,預計今年8月實現貫通。

    (記者蔡曉丹攝影報道)

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