本文選題：地鐵 + 盾構(gòu)掘進(jìn)��； 參考：《城市軌道交通研究》2017年04期

【摘要】：當(dāng)盾構(gòu)拱頂遇到粉細(xì)砂層,地表沉降累積值和速率均易超標(biāo)。通過(guò)繪制單線盾構(gòu)隧道地表沉降空間分布圖,發(fā)現(xiàn)沉降大的區(qū)域與粉細(xì)砂層有明顯的相關(guān)性。原因是粉細(xì)砂的粘聚力較小,自穩(wěn)性差,容易受擾動(dòng)坍塌,引起較大超挖。采用有限元軟件Plaxis進(jìn)行數(shù)值模擬。結(jié)果表明,相同盾構(gòu)掘進(jìn)參數(shù)下,含粉細(xì)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(shè)計(jì)研究院有限公司;
【分類號(hào)】：U455.43;P642.26
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本文編號(hào)：2056747