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建立了粉煤灰地基上高层建筑-桩筏基础-地基共同作用的数值分析模型,通过模拟不同距径比和桩长的桩筏基础,研究了筏板的受力响应问题.数值模拟分析表明在上部结构荷载作用下筏板及桩体周围的位移量较大,离桩筏基础越远位移量越小,筏板的沉降呈盆状;桩距径比越大筏板沉降量越大,桩长越大筏板沉降量越小.由于桩体轴力的作用,筏板边缘桩体位置处的剪应力出现集中,且筏板负弯矩有极大值;筏板内弯矩随着上部结构荷载的增大而增大;桩距径比越大筏板内的弯矩越小,桩长越大筏板内的弯矩越大.
The numerical analysis model of high-rise building-piled raft foundation-ground interaction on fly ash foundation is established, and the stress response of raft is studied by simulating the piled raft foundation with different aspect ratio and pile length. Numerical simulation shows The displacements of the raft and the pile around the pile under the superstructure load are larger, the farther away from the piled raft is, the settlement of the raft is a basin. The larger the pile diameter-to-diameter ratio is, The larger the pile length is, the smaller the settlement of the raft is. Due to the axial force of the pile body, the shear stress at the pile edge of the raft edge concentrates and the negative moment of the raft has a maximum value; The load of the superstructure increases and increases; the greater the ratio of pile diameter to diameter of the raft is, the larger the pile length is, the larger the bending moment is in the raft.