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(1 武漢理工大學(xué)土木工程與建筑學(xué)院, 武漢 430070; 2 中鐵建設(shè)集團有限公司, 北京 100040;3 中建三局安裝工程有限公司, 武漢 430075)
摘要: 褥墊層是影響復(fù)合地基工作性能的關(guān)鍵影響因素. 由于研究手段的欠缺,目前對復(fù)合地基褥墊層工作性能的認識還有待深入. 采用開發(fā)的混合試驗裝置及數(shù)據(jù)交互系統(tǒng)開展混合試驗,建立了褥墊層與上部加載的物理模型與樁土地基數(shù)值模型相結(jié)合的全組件參與的試驗方法,大大縮減了模型試驗工作量. 利用該試驗方法開展了3 組不同褥褥墊層厚度的混合試驗,分析了復(fù)合地基褥墊層的工作性能,揭示了樁土荷載傳遞規(guī)律、沉降規(guī)律及樁側(cè)摩阻力的分布. 隨著褥墊層厚度的增加,樁間土承擔(dān)的荷載以及樁土相對位移增加;當(dāng)褥墊層厚度超過 200mm時,樁土荷載分擔(dān)比趨于穩(wěn)定.
關(guān)鍵詞: 復(fù)合地基; 混合試驗; 工作性能; 褥墊層; 樁土荷載分擔(dān)比
中圖分類號:TU443 文獻標志碼:A 文章編號:1002-848X(2023)09-0128-05
DOI:10. 19701 / j. jzjg. 20211309
Hybrid test study of working performance of composite foundation cushion
RUI Rui1, ZHENG Xiaomin1, ZHENG Xiaoyan2, GU Jinlin3, TIAN Zijin1
(1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China;2 China Railway Construction Group Co. , Ltd. , Beijing 100040, China; 3 China ConstructionThird Engineering Bureau, Installation Engineering Co. , Ltd. , Wuhan 430075, China)
Abstract: Cushion is the key influencing factor to the working performance of composite foundation. Due to the lack ofresearch techniques, the understanding of the working performance of composite foundation cushion needs to be deeplyinvestigated. The hybrid tests was carried out by using the developed hybrid test device and data interaction system, andthe whole-component participating test method combining the physical model of the cushion and upper loading with thenumerical model of pile-soil foundation was established, which greatly reduced the work of model tests. Using this testmethod, three groups of hybrid tests with different thickness of cushion were carried out, the working performance ofcushion on composite foundation was analyzed, and the mechanism of load transfer, settlement and distribution of frictionresistance on pile side were revealed. With the increase of cushion thickness, the load bearing by soil between piles and therelative displacement of piles to soil increased. When the cushion thickness exceeded 200 mm, the pile-soil load bearingratio tended to be stable.
Keywords:composite foundation; hybrid test; working performance; cushion; pile-soil load bearing ratio
∗國家自然科學(xué)基金(51208403,51708438).
第一作者:芮瑞,教授,博士,博士生導(dǎo)師,主要從事地基處理、巖土工程加固技術(shù)方面的研究與教學(xué)工作,Email: r. rui@ whut.edu. cn.
[引用本文] 芮瑞,鄭曉敏,鄭筱彥,等. 復(fù)合地基褥墊層工作性能的混合試驗研究[ J]. 建筑結(jié)構(gòu),2023,53(9):128-132,52. RUI Rui,ZHENG Xiaomin,ZHENG Xiaoyan,et al. Hybrid test study of working performance of compositefoundation cushion[J]. Building Structure,2023,53(9):128-132,52.
