軟土狹長(zhǎng)深基坑抗隆起破壞模式試驗(yàn)研究
[Abstract]:In view of the condition that the bottom layer of foundation pit in soft soil area is saturated soft clay, the anti-uplift centrifugal model test of long and narrow deep foundation pit is designed, and the moment and earth pressure distribution of retaining wall of foundation pit under different excavation depth and water level are analyzed. Horizontal displacement and stability failure mechanism of foundation pit uplift. Based on the basic parameters and working conditions of centrifugal model test, the finite element numerical model is established, and the stability and failure state of foundation pit under test condition are analyzed and compared. The test results show that with the increase of excavation depth and the water level outside the pit, the bottom soft soil produces upward uplift deformation. When the uplift is large, the surrounding wall is weakened due to the lateral constraint of the soil in the pit. At the bottom, the horizontal displacement in the pit is larger, and the axial force of the support is increased. The foundation pit finally shows the failure of the retaining wall turning and kicking around a certain supporting point in the pit. The numerical results show that with the increase of the water level outside the pit, the safety factor of anti-uplift stability of foundation pit decreases gradually. When the anti-uplift stability failure occurs, the uplift displacement of the foundation pit bottom is larger, and the failure mechanism is the same as the result of centrifugal model test.
【作者單位】: 鹽城工學(xué)院土木工程學(xué)院;同濟(jì)大學(xué)地下建筑與工程系;同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金青年基金項(xiàng)目(No.41402270) 江蘇省科技計(jì)劃前瞻性聯(lián)合研究項(xiàng)目(No.BY2014108-26)~~
【分類號(hào)】:TU753
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