側(cè)部松動(dòng)情況下盾構(gòu)隧道橫向變形特征研究
[Abstract]:Excavation of foundation pit in adjacent tunnel, soil erosion in adjacent tunnel or soil erosion in tunnel itself can result in loosening of soil around the tunnel, and change of soil stress around existing tunnel. As a result, the transverse stress mode of tunnel is changed, and the safety of tunnel structure is affected. At first, an engineering example is introduced in detail. On the basis of this, the variation modes of tunnel lateral bearing capacity and tunnel structure shape under different loosening angles and degrees of loosening are studied by using finite element method. The regularity of tunnel segment concrete stress, bolt stress at the joint and the opening of segment joint in the course of tunnel disaster development are revealed in this paper. The results show that the loosening of the side of the tunnel first results in the compressive spalling of concrete inside the waist joint of the tunnel, the vertical convergence value of the tunnel reaches 0.5D (D is the outer diameter of the tunnel), and the bolt of the top joint is subjected to tensile yield and fracture.
【作者單位】: 濱海土木工程結(jié)構(gòu)與安全教育部重點(diǎn)實(shí)驗(yàn)室(天津大學(xué));天津大學(xué)建筑工程學(xué)院;
【基金】:國(guó)家自然科學(xué)基金重點(diǎn)資助項(xiàng)目(41630641)~~
【分類號(hào)】:U455.43
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