【摘要】：深基坑開挖時周圍土體的卸荷作用將引起鄰近既有地鐵隧道的變形,對其正常使用產(chǎn)生影響,隔離樁的位置控制隧道變形的效果值得研究�；诤贾菔心撤拷ǖ叵率一庸こ滩捎酶綦x樁保護鄰近既有地鐵隧道的工程案例,采用ABAQUS有限元軟件進行數(shù)值模擬,建立二維模型對隔離樁在不同位置條件下隧道的變形進行了分析。研究結果表明:基坑開挖最終引起隧道下沉約3.1 mm,隧道向靠近基坑方向水平位移約1.7 mm,數(shù)值模擬計算結果與現(xiàn)場實測數(shù)據(jù)的相關規(guī)律吻合;隔離樁距離隧道越近,基坑開挖對既有地鐵隧道變形的影響越小。
[Abstract]:The unloading effect of soil around deep foundation pit excavation will cause deformation of adjacent existing subway tunnel, which will have an effect on its normal use. The effect of controlling tunnel deformation by the position of isolated pile is worth studying. Based on the case of a basement foundation pit project in Hangzhou City, which uses isolated piles to protect adjacent existing subway tunnels, the numerical simulation is carried out by using ABAQUS finite element software. A two-dimensional model was established to analyze the tunnel deformation of the isolated pile in different positions. The results show that the tunnel subsidence is about 3.1 mm and the horizontal displacement of tunnel is about 1.7 mm in the direction of foundation pit excavation. The results of numerical simulation are consistent with the field measured data, the closer the isolated pile is to the tunnel, the closer the tunnel is. The influence of excavation on the deformation of existing subway tunnel is smaller.
【作者單位】： 華東交通大學江西省巖土工程基礎設施安全與控制重點實驗室;浙江省工業(yè)設計研究院;浙江大學濱海和城市巖土工程研究中心;
【基金】：國家“973”計劃(2015CB057801) 國家自然科學基金(51278449,51238009,51338009)資助
【分類號】：TU753;U231;U456.3

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