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（內(nèi)蒙古科技大學(xué)，包頭014010）

［提要］以模型試驗為基礎(chǔ)，對傳統(tǒng)復(fù)合地基及變剛度復(fù)合地基在豎向荷載作用下的力學(xué)性狀進行分析研究。通過11組模型試驗，對改變樁長的單樁、群樁復(fù)合地基及變剛度復(fù)合地基在豎向荷載作用下的內(nèi)力及變形進行了量測和記錄，試驗揭示了樁土相互作用、荷載傳遞過程、樁土應(yīng)力比、荷載分擔(dān)比等規(guī)律。試驗結(jié)果表明，變樁長CFG樁復(fù)合地基受力更合理、造價低、更經(jīng)濟。

［關(guān)鍵詞］復(fù)合地基；變剛度；樁土應(yīng)力比；樁土荷載分擔(dān)比

Research on Pile soil Proportion of Load of Variation Rigidity Composite Foundatio/Yang Yongxin (Innei Mongolia University of Science and Technology, Baotou 014010, China)

Abstract:The mechanics properties of composite foundation and the variation rigidity compositefoundation by scale model tests are studied. Eleven model experiments are conducted, including the single pile, pile group composite foundations with different length, and the variation rigidity composite foundations. The stresses and settlements of the model tests under vertical loads are measured. The principles of pile soil co-interaction, transferring of loads, pile soil stress ratio, pilesoil proportion of load and differential settlements are revealed by experiments. The test results indicate that variable length CFG composite foundation is more reasonable, low cost and more economical.