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(1 河北省土木工程綠色建造與智能運(yùn)維重點(diǎn)實(shí)驗(yàn)室， 秦皇島 066004；2 燕山大學(xué)建筑工程與力學(xué)學(xué)院， 秦皇島 066004； 3 中交隧道局華中工程有限公司， 武漢 430014)
［摘要］采用室內(nèi)模型試驗(yàn)及PFC 2D離散元軟件模擬了靜壓開口管樁沉樁過程，對樁周土體的擠土效應(yīng)進(jìn)行宏觀、細(xì)觀分析。通過模型試驗(yàn)，對在均質(zhì)硬層和上硬下軟兩種地基中靜壓開口管樁過程中產(chǎn)生的位移場進(jìn)行對比分析，獲得了樁周不同位置土體的三種位移變化區(qū)域，分別為以斜向上位移為主的淺表層區(qū)域，以徑向位移為主的樁側(cè)區(qū)域和以斜向下位移為主的樁端側(cè)向土體區(qū)域，揭示了樁周不同位置處土體位移在水平和深度方向的變化規(guī)律，特別是在軟硬土層分界面處，土體在水平方向位移值達(dá)到最大，且沿深度方向的運(yùn)動趨勢更加明顯。以模型試驗(yàn)為基礎(chǔ)，建立了靜壓開口管樁沉樁顆粒流模型，進(jìn)行數(shù)值模擬，并將數(shù)值模擬結(jié)果與試驗(yàn)結(jié)果進(jìn)行對比分析，分析表明兩者較為吻合。通過特征點(diǎn)位移路徑分析了土體細(xì)觀變化模式：均質(zhì)硬層土顆粒運(yùn)動軌跡呈現(xiàn)出“J”狀，上硬下軟雙層地基土顆粒運(yùn)動軌跡近似為“><”形。
［關(guān)鍵詞］開口管樁；擠土效應(yīng)；層狀地基；模型試驗(yàn)；顆粒流
中圖分類號：TU473-1 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)15-0115-09
Study on soil squeezing effect of open-ended jacked pipe pile in layered ground
LI Yunong1,2, ZHANG Yawei1,2, LIU Yahui1,2, JIN Dicheng1,2, HAN Yi3
(1 Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province, Qinhuangdao 066004， China； 2 School of Civil Engineering & Mechanics, Yanshan University, Qinhuangdao 066004， China；3 China Communications Construction Tunnel Engineering Company Limited, Wuhan 430014, China)
Abstract: Indoor model test and PFC 2D discrete element software were used to simulate the sinking process of open-ended jacked pipe pile, and the soil squeezing effect around the pile was analyzed from the aspects of macro and micro. Comparative analysis of displacement fields generated by open-ended jacked pipe pile into homogeneous hard layer and upper hard and below soft foundations was analyzed by model test, three displacement change patterns of soil at different positions around the pile was obtained, respectively, the shallow layer region dominated by oblique upward displacement, the pile side area dominated by radial displacement and the pile tip lateral soil area dominated by oblique downward displacement, and the variation laws of soil displacement in the horizontal and depth directions at different locations around the pile was revealed, especially at the interface between soft and hard soil layers, the displacement of the soil reaches the maximum in the horizontal direction, and the movement trend along the depth direction is more obvious. Based on model test, a particle flow model of open-ended jacked pipe pile was established, and the numerical simulation was carried out. The numerical results and test results were compared and analyzed, the analysis shows that the two are relatively consistent, and the microscopic variation pattern of the soil was analyzed by displacement path of feature points: the particle motion trajectory of the homogeneous hard layer soil presents a "J" shape, the particle motion trajectory of the upper hard and below soft foundations soli is approximately in the shape of "><".
Keywords:open-ended pipe pile； soil squeezing effect； layered ground； model test； particle flow
*國家自然科學(xué)基金青年基金資助項(xiàng)目（51408527），河北省自然科學(xué)基金青年基金資助項(xiàng)目（E2015203195）。
作者簡介：李雨濃，博士，副教授，碩士生導(dǎo)師，Email:liyunong-ren@163.com。
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