本文選題：地鐵 + 盾構掘進　； 參考：《城市軌道交通研究》2017年04期

【摘要】：當盾構拱頂遇到粉細砂層,地表沉降累積值和速率均易超標。通過繪制單線盾構隧道地表沉降空間分布圖,發(fā)現沉降大的區(qū)域與粉細砂層有明顯的相關性。原因是粉細砂的粘聚力較小,自穩(wěn)性差,容易受擾動坍塌,引起較大超挖。采用有限元軟件Plaxis進行數值模擬。結果表明,相同盾構掘進參數下,含粉細砂區(qū)域的地層地表沉降明顯偏大。
[Abstract]:Through drawing the distribution map of surface settlement of single - wire shield tunnel , it is found that the area with large settlement is obviously related to the fine sand layer . The reason is that the cohesive force of fine sand is small , the self - stability is poor , the disturbance collapse is easy , and the large super - excavation is caused . The numerical simulation is carried out by using finite element software Plaxis . The results show that the surface subsidence of stratum with fine sand area is obviously larger than that of the same shield tunneling parameter .
【作者單位】： 北京市勘察設計研究院有限公司;
【分類號】：U455.43;P642.26
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本文編號：2056747