本文選題：剛性樁復(fù)合地基 + 褥墊層��； 參考：《建筑結(jié)構(gòu)學(xué)報》2014年03期

【摘要】：基于飽和砂井滲流固結(jié)理論,推導(dǎo)了綜合考慮褥墊層、樁、土模量的剛性樁復(fù)合地基滲流固結(jié)解析解。在ABAQUS中使用Modified Cam-clay模型和孔壓單元模擬樁間土體,建立單樁復(fù)合地基有限元分析模型。計算結(jié)果與某高層結(jié)構(gòu)剛性樁復(fù)合地基靜載試驗吻合較好,驗證分析模型的有效性。使用該分析模型,研究褥墊層厚度、模量,樁長對剛性樁復(fù)合地基受力及固結(jié)變形的影響。結(jié)果表明:剛性樁復(fù)合地基固結(jié)速度遠(yuǎn)大于天然地基,固結(jié)速度隨褥墊層模量增大而增大,隨井徑比減小而增大;結(jié)構(gòu)施工過程中,地基固結(jié)沉降已基本完成;褥墊層模量的增大可減小剛性樁復(fù)合地基固結(jié)沉降,但褥墊層厚度及排水土層厚度的增加都會加大固結(jié)沉降。
[Abstract]:Based on the seepage consolidation theory of saturated sand wells, an analytical solution for seepage consolidation of rigid pile composite foundation considering cushion, pile and soil modulus is derived. In ABAQUS, Modified Cam-clay model and pore pressure element are used to simulate the soil between piles, and the finite element analysis model of single pile composite foundation is established. The calculated results are in good agreement with the static load test of a rigid pile composite foundation of a high-rise structure, which verifies the validity of the analytical model. The effects of cushion thickness, modulus and pile length on the stress and consolidation deformation of rigid pile composite foundation are studied by using the analytical model. The results show that the consolidation speed of rigid pile composite foundation is much faster than that of natural foundation, and the consolidation velocity increases with the increase of cushion modulus and decreases with the decrease of shaft diameter ratio, and the consolidation settlement of foundation is basically completed during the construction of structure. The increase of cushion modulus can reduce the consolidation settlement of rigid pile composite foundation, but the increase of cushion thickness and drainage soil layer thickness will increase the consolidation settlement.
【作者單位】： 華南理工大學(xué)亞熱帶建筑科學(xué)國家重點實驗室;科，

本文編號：1902478