黏彈性地基中基坑開挖對鄰近樁基變形影響的時(shí)域解
[Abstract]:At present, the research on the influence of excavation and unloading on the deformation of adjacent pile foundation is based on the instantaneous excavation condition, and the influence of time effect on the pile-soil interaction is seldom considered. But in actual engineering, soft soil has obvious rheological effect under excavation. From the point of view of viscoelasticity of foundation, the time-domain problem of interaction between excavation of foundation pit and adjacent pile foundation in viscoelastic foundation is studied by using two-stage method. In the first stage, based on the Boltzmann viscoelastic model, the time-domain solution of Mindlin is derived, which is used to analyze the soil additional stress caused by excavation of foundation pit in viscoelastic foundation. In the second stage, Pasternak foundation model is used to analyze the interaction between pile foundation and viscoelastic soil, and the simplified time-domain solution of horizontal deformation of pile foundation considering rheological effect is obtained. Finally, a large finite difference software is used to simulate the related working conditions, and the numerical simulation results are compared with the simplified time-domain solution, and a good agreement is obtained. In addition, the influence factors of Boltzmann viscoelastic model parameters (volume modulus, shear modulus, viscosity coefficient), pile diameter, excavation depth, pile-to-pit spacing and excavation size are also analyzed. The analysis results show that the simplified time-domain solution can well reflect the influence of excavation on the horizontal deformation of adjacent pile foundation, and the development trend of pile foundation deformation with time, which can provide some theoretical basis for relevant practical engineering.
【作者單位】: 上海理工大學(xué)環(huán)境與建筑學(xué)院;國土資源部丘陵山地地質(zhì)災(zāi)害防治重點(diǎn)實(shí)驗(yàn)室;中國建筑科學(xué)研究院建筑安全與環(huán)境國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金項(xiàng)目(No.41772331) 上海自然科學(xué)基金項(xiàng)目(No.15ZR1429400) 國土資源部丘陵山地地質(zhì)災(zāi)害防治重點(diǎn)實(shí)驗(yàn)室課題(No.2015k005) 建筑安全與環(huán)境國家重點(diǎn)實(shí)驗(yàn)室課題(No.BSBE2015-01)~~
【分類號】:TU433;TU753
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