- 摘 要
-
（中國建筑科學(xué)研究院， 北京 100013）
［摘要］豎向力作用下單樁會發(fā)生沉降，貫入變形是沉降量的主要組成部分。一直以來，貫入變形無法確切地歸為彈性變形或者塑性變形，在理論上這也不便于用彈性解計算樁基礎(chǔ)沉降?；诠こ虡鹅o載荷試驗研究了單樁荷載傳遞機制，發(fā)現(xiàn)在工作荷載作用下，當(dāng)樁端是平底形且持力層相對較好時，貫入變形呈現(xiàn)小變形特征； 樁端阻力和貫入變形為線彈性關(guān)系，不存在樁端刺入持力層的情況； 從理論層面研究了考慮樁徑影響的Mindlin位移解，證明貫入變形是局部彈性壓縮變形，不是塑性變形，這為利用彈性解研究工作荷載作用下樁基礎(chǔ)沉降提供了積極的支撐。
［關(guān)鍵詞］貫入變形； 局部壓縮； 彈性變形； Mindlin位移解
中圖分類號：TU443文獻標(biāo)識碼：A文章編號：1002-848X(2020)21-0102-04
Discussion on mechanism of single pile penetration deformation
QIU Mingbing, GAO Wensheng, LIU Jinli, REN Xinjian
(China Academy of Building Research, Beijing 100013, China)
Abstract:The single pile is subjected to vertical force to produce settlement, and penetration deformation is the main component. It has always been a fuzzy zone whether the penetration deformation is elastic or plastic, which creates theoretical obstacles for calculating the settlement of pile foundations with elastic solutions. The load transfer mechanism of a single pile based on the static load test of an engineering pile was studied. It is found that under working loads, when the pile end is flat-bottomed and the bearing layer is relatively good, the penetration deformation presents small deformation characteristics; the end resistance and penetration deformation are linear elastic relationships, and there is no situation that the pile end penetrates the bearing layer; theoretically, the Mindlin displacement solution considering the influence of the pile diameter was studied, and it is proved that the penetration deformation is local elastic compression rather than plastic deformation. This provides active support for studying the settlement of pile foundation under working loads by using elastic solution.
Keywords:penetration deformation; local compression; elastic deformation; Mindlin displacement solution
作者簡介：邱明兵，碩士，高級工程師，Email: qiumb@sina.com。
