广西大学学报（自然科学版）
廣西大學學報（自然科學版）
엄서대학학보（자연과학판）
JOURNAL OF GUANGXI UNIVERSITY （NATURAL SCIENCE EDITION）
2014年
4期
817-822
,共6页
复合桩%振动台%超静孔隙水压力%土压力%液化土
複閤樁%振動檯%超靜孔隙水壓力%土壓力%液化土
복합장%진동태%초정공극수압력%토압력%액화토
composite pile%shaking table%pressure of excess pore water%earth pressure%liques-cent soil
为进一步研究复合桩加固液化土地基机理，制备未加固、碎石桩与钢管桩、水泥土桩与钢管桩复合加固三种地基模型，模拟地震荷载，进行振动台试验。通过数据采集系统采集三种模型数据，整理出地基在振动过程中不同埋深处的超静孔隙水压力时程曲线和土压力时程曲线。结果表明：未加固、水泥土桩与钢管桩复合加固模型超静孔隙水压力增长到峰值7 kPa 左右，保持不变到试验结束，碎石桩与钢管桩复合加固达到峰值为5 kPa 左右，试验结束时减小到2.5 kPa 左右，其中碎石桩起到消散超静孔隙水压力的作用；未加固、水泥土桩与钢管桩复合加固的土压力达到峰值105 kPa 左右，之后减小了35 kPa 左右；碎石桩与钢管桩复合加固地基模型土压力值与峰值相等为110 kPa 左右，土体强度较高，复合地基承载能力较大。表明采用碎石桩与钢管桩复合加固不仅有效的抵抗土体液化，而且还提高了复合地基的承载能力，为碎石桩与刚性桩复合加固液化土在实际工程中的推广应用起到参考作用。
為進一步研究複閤樁加固液化土地基機理，製備未加固、碎石樁與鋼管樁、水泥土樁與鋼管樁複閤加固三種地基模型，模擬地震荷載，進行振動檯試驗。通過數據採集繫統採集三種模型數據，整理齣地基在振動過程中不同埋深處的超靜孔隙水壓力時程麯線和土壓力時程麯線。結果錶明：未加固、水泥土樁與鋼管樁複閤加固模型超靜孔隙水壓力增長到峰值7 kPa 左右，保持不變到試驗結束，碎石樁與鋼管樁複閤加固達到峰值為5 kPa 左右，試驗結束時減小到2.5 kPa 左右，其中碎石樁起到消散超靜孔隙水壓力的作用；未加固、水泥土樁與鋼管樁複閤加固的土壓力達到峰值105 kPa 左右，之後減小瞭35 kPa 左右；碎石樁與鋼管樁複閤加固地基模型土壓力值與峰值相等為110 kPa 左右，土體彊度較高，複閤地基承載能力較大。錶明採用碎石樁與鋼管樁複閤加固不僅有效的牴抗土體液化，而且還提高瞭複閤地基的承載能力，為碎石樁與剛性樁複閤加固液化土在實際工程中的推廣應用起到參攷作用。
위진일보연구복합장가고액화토지기궤리，제비미가고、쇄석장여강관장、수니토장여강관장복합가고삼충지기모형，모의지진하재，진행진동태시험。통과수거채집계통채집삼충모형수거，정리출지기재진동과정중불동매심처적초정공극수압력시정곡선화토압력시정곡선。결과표명：미가고、수니토장여강관장복합가고모형초정공극수압력증장도봉치7 kPa 좌우，보지불변도시험결속，쇄석장여강관장복합가고체도봉치위5 kPa 좌우，시험결속시감소도2.5 kPa 좌우，기중쇄석장기도소산초정공극수압력적작용；미가고、수니토장여강관장복합가고적토압력체도봉치105 kPa 좌우，지후감소료35 kPa 좌우；쇄석장여강관장복합가고지기모형토압력치여봉치상등위110 kPa 좌우，토체강도교고，복합지기승재능력교대。표명채용쇄석장여강관장복합가고불부유효적저항토체액화，이차환제고료복합지기적승재능력，위쇄석장여강성장복합가고액화토재실제공정중적추엄응용기도삼고작용。
In order to study the mechanism of using composite pile to reinforce liquescent soil foun-dation, three models, including un-reinforced foundation, foundation reinforced by gravel pile and steel pipe pile, foundation reinforced by cement pile and steel pipe pile were prepared, and simula-ted seismic load was applied by the shaking table test. Pressure-time curve of excess pore water in different depth and pressure-time curve of earth in different depth were sorted out from the data col-lected by the data acquisition system in the three models during the vibration of foundations. The test results show that the pressure of excess pore water of the un-reinforced and foundation reinforced by cement pile and steel pipe pile was increased to the peak around 7 kPa and the pressure remained 7 kPa until the end of the test. The pressure of excess pore water of the foundation reinforced by gravel pile and steel pipe pile was increased to the peak around 5 kPa and it was reduced to about 2. 5 kPa at the end of the test. The gravel pile plays a role of dissipating the pressure of excess pore water. The earth pressure of the un-reinforced and foundation reinforced by cement pile and steel pipe pile was increased to the peak around 105 kPa, then reduced by about 35 kPa. The earth pres-sure of foundation reinforced by gravel pile and steel pipe pile is equal to the peak about 110 kPa.Soil strength and the bearing capacity of composite foundation are high. Therefore, using the founda-tion reinforced by gravel pile and steel pipe pile can effectively resist soil liquefaction and improve foundation bearing capacity. The research plays a reference role for the promotion of gravel pile and rigid pile reinforced liquefied soil in engineering.
