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（西安科技大學(xué)建筑與土木工程學(xué)院， 西安 710054）
［摘要］基于西安黃土地區(qū)某工程，通過埋設(shè)土壓力盒，完成了豎向增強(qiáng)體、單樁復(fù)合地基靜載荷試驗，經(jīng)數(shù)據(jù)分析，對CFG樁復(fù)合地基的承載性狀及樁土的受力情況進(jìn)行了探討。結(jié)果表明：樁土應(yīng)力比隨荷載增大，最終趨于穩(wěn)定；當(dāng)荷載達(dá)到一定水平后，復(fù)合地基承載性狀和單樁趨于一致，樁間土承載力發(fā)揮不足。并根據(jù)樁土共同作用機(jī)理，在高應(yīng)力水平下，可考慮單樁作用機(jī)理或樁間土承載力發(fā)揮系數(shù)β相應(yīng)取小值來計算復(fù)合地基承載力，為相關(guān)工程提供參考。
［關(guān)鍵詞］CFG樁復(fù)合地基； 承載性狀； 靜載荷試驗； 樁土應(yīng)力比； 樁間土承載力發(fā)揮系數(shù)
中圖分類號：TU473-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2017)23-0100-03
Experimental research on load-bearing property of CFG pile composite foundation
Zhi Bin, Li Ge, Wang Yongxin, Guo Jie, Wang Pan
(School of Architecture and Civil Engineering, Xi′an University of Science and Technology， Xi′an 710054, China)
Abstract:Based on a project in the loess area of Xi′an,the static load test of vertical reinforcement and single pile composite foundation was completed by embedding earth pressure box. Based on the data analysis, the bearing capacity of CFG pile composite foundation and the stress condition of pile and soil were discussed. The results show that the pile-soil stress ratio increases with increase of load and eventually tends to be stable. When the load reaches a certain level, the bearing behavior of the composite foundation is consistent with the single pile, and the bearing capacity of the soil between the piles is not enough. According to the interaction mechanism of pile and soil, under high stress level, the bearing capacity of composite foundation can be calculated by considering action mechanism of single pile or the developing coefficient β taken as the smaller value of bearing capacity of soil between piles, which can provide reference for the related engineering.
Keywords:CFG pile composite foundation; bearing capacity; static load test; pile-soil stress ratio; developing coefficient of bearing capacity of soil between piles
*國家自然科學(xué)基金項目（41172262）。
作者簡介：郅彬，博士，副教授，Email:xianzhibin@163.com。
