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（中國建筑科學(xué)研究院地基基礎(chǔ)研究所 北京100013）
【提要】 根據(jù)Mindlin解所得的Geddes應(yīng)力公式將樁端阻力、樁側(cè)阻力簡化為集中力。對(duì)于長徑比較小的短樁，按其計(jì)算結(jié)果導(dǎo)致近樁端平面以下的應(yīng)力集中，此時(shí)計(jì)算豎向應(yīng)力系數(shù)與實(shí)際考慮樁徑影響的結(jié)果相差甚遠(yuǎn)。按Geddes應(yīng)力公式計(jì)算時(shí)小樁距群樁帶來的問題較??；用于計(jì)算單樁、單排樁、疏樁沉降將使計(jì)算深度范圍內(nèi)的應(yīng)力大大超過土的強(qiáng)度，使土進(jìn)入塑性狀態(tài)，導(dǎo)致計(jì)算失真。推薦的應(yīng)力計(jì)算方法考慮了樁徑的影響，用于計(jì)算單樁、單排樁、疏樁沉降取得了良好的效果。
【關(guān)鍵詞】 Mindlin解 應(yīng)力系數(shù) 沉降計(jì)算 Geddes應(yīng)力公式
New Stress Calculation Method for Mindlin Formula Considering Impact of Piles Diameters/
Wang Tao(China Academy of Building Research, Beijing 100013, China)
Abstract:Geddes stress formula deduced from Mindlin solution simplifies the shaft resistance and tip resistance into centralized force. For short piles with low ratio of length to diameter, calculation results will make the stress concentration in the near tip of the piles, which is much more different from the actual results. Geddes stress formula will result in small problem in small group piles. When Geddes stress formula is adopted to calculate the settlement of single pile, oneline pile and sparse pile foundation, the stress will significantly exceed the strength of soil and make it into plasticity state. So the calculation is distorted. Therefore, this article calculates Mindlin stress factor considering piles diameterimpact. This method can be used in signal pile, oneline pile and sparse pile foundation settlement calculations and achieve good results.
Keywords:Mindlin solution； stress coefficient； settlement calculation； Geddes stress f
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