工程科学学报，第37卷，第3期：390-397,2015年3月 Chinese Journal of Engineering,Vol.37,No.3:390-397,March 2015 DOI:10.13374/j.issn2095-9389.2015.03.020:http://journals.ustb.edu.cn 复合振冲碎石桩加固机理及施工过程数值模拟 刘 洋1,2)区，闫鸿翔》，汪成林D 1)北京科技大学土木与环境工程学院，北京1000832)北京科技大学金属矿山高效开采与安全教有部重点实验室，北京100083 3)中国公路工程咨询集团有限公司，北京100097 ☒通信作者，E-mail:imaginationly(@l63.com 摘要采用振动荷载作用下超孔隙水压力产生的能量模型，考虑耗散能量和孔径扩张的影响及相互作用，并进行合理的简 化，对复合振冲碎石桩施工过程做了数值模拟.采用有限差分离散求解复合振冲碎石桩边值问题，编制相应的数值程序，基 于模拟结果详细讨论了排水井的存在对复合振冲碎石桩孔隙水压力发展变化的影响。最后对普通碎石桩和复合碎石桩的地 基加固效果进行对比分析.数值模拟结果表明，复合振冲碎石桩由于排水井的存在，使地基加固范围明显增大，并且可以应 用于渗透系数较小的粉土和砂质粉土地基中. 关键词地基：加固：桩：相对密度：数值模拟 分类号TU472.99 Reinforcement mechanism of vibro-stone columns with additional wicks and numerical analysis LIU Yang,YAN Hong-xiang,WANG Cheng-lin) 1)School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines,University of Science and Technology Bei- jing,Beijing 100083,China 3)China Highway Engineering Consulting Corporation,Beijing 100097,China Corresponding author,E-mail:imaginationly@163.com ABSTRACT An energy model of excess pore pressure generation under vibration loading was adopted to simulate the installation process of composite vibro-stone columns.The interaction between the energy dissipation and hole expansion was taken into account and a reasonable simplification was made in the simulation.The finite difference method was used to discretize the reinforced area and to solve the boundary value problem.A numerical program was developed to simulate the installation process of composite vibro-stone columns.The influence of wicks on the variation of pore pressure for composite vibro-stone columns was discussed in details.Finally, the reinforcement results were compared between traditional stone columns and composite vibro-stone columns.Numerical simulation indicates that the reinforced areas of composite vibro-stone columns are obviously lager than those of the traditional stone column duo to the existence of additional wicks.This reinforcement method is not only suitable for the sand ground but also valid for the silt or silt- sand ground. KEY WORDS foundations:reinforcement:columns;relative density:numerical simulation 地基加固在实际工程中非常常见，加固方法有很多种，其中振冲碎石桩法广泛应用于加固砂土类地基， 收稿日期：2013-1202 基金项目：北京市青年英才计划资助项目(YETPO340):中央高校基本科研业务费资助项目(FRF-TP一12O01B):新世纪优秀人才资助项目 (NCET-11-0579):国家自然科学基金资助项目(51178044)工程科学学报，第 37 卷，第 3 期: 390--397，2015 年 3 月 Chinese Journal of Engineering，Vol． 37，No． 3: 390--397，March 2015 DOI: 10． 13374 /j． issn2095--9389． 2015． 03． 020; http: / /journals． ustb． edu． cn 复合振冲碎石桩加固机理及施工过程数值模拟 刘 洋1，2) ，闫鸿翔3) ，汪成林1) 1) 北京科技大学土木与环境工程学院，北京 100083 2) 北京科技大学金属矿山高效开采与安全教育部重点实验室，北京 100083 3) 中国公路工程咨询集团有限公司，北京 100097  通信作者，E-mail: imaginationly@ 163． com 摘 要 采用振动荷载作用下超孔隙水压力产生的能量模型，考虑耗散能量和孔径扩张的影响及相互作用，并进行合理的简 化，对复合振冲碎石桩施工过程做了数值模拟． 采用有限差分离散求解复合振冲碎石桩边值问题，编制相应的数值程序，基 于模拟结果详细讨论了排水井的存在对复合振冲碎石桩孔隙水压力发展变化的影响． 最后对普通碎石桩和复合碎石桩的地 基加固效果进行对比分析． 数值模拟结果表明，复合振冲碎石桩由于排水井的存在，使地基加固范围明显增大，并且可以应 用于渗透系数较小的粉土和砂质粉土地基中． 关键词 地基; 加固; 桩; 相对密度; 数值模拟 分类号 TU472. 99 Ｒeinforcement mechanism of vibro-stone columns with additional wicks and numerical analysis LIU Yang1，2)  ，YAN Hong-xiang3) ，WANG Cheng-lin1) 1) School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines，University of Science and Technology Bei￾jing，Beijing 100083，China 3) China Highway Engineering Consulting Corporation，Beijing 100097，China  Corresponding author，E-mail: imaginationly@ 163． com ABSTＲACT An energy model of excess pore pressure generation under vibration loading was adopted to simulate the installation process of composite vibro-stone columns． The interaction between the energy dissipation and hole expansion was taken into account and a reasonable simplification was made in the simulation． The finite difference method was used to discretize the reinforced area and to solve the boundary value problem． A numerical program was developed to simulate the installation process of composite vibro-stone columns． The influence of wicks on the variation of pore pressure for composite vibro-stone columns was discussed in details． Finally， the reinforcement results were compared between traditional stone columns and composite vibro-stone columns． Numerical simulation indicates that the reinforced areas of composite vibro-stone columns are obviously lager than those of the traditional stone column duo to the existence of additional wicks． This reinforcement method is not only suitable for the sand ground but also valid for the silt or silt￾sand ground． KEY WOＲDS foundations; reinforcement; columns; relative density; numerical simulation 收稿日期: 2013--12--02 基金项目: 北京市青年英才计划资助项目( YETP0340) ; 中央高校基本科研业务费资助项目( FＲF--TP--12--001B) ; 新世纪优秀人才资助项目 ( NCET--11--0579) ; 国家自然科学基金资助项目( 51178044) 地基加固在实际工程中非常常见，加固方法有很 多种，其中振冲碎石桩法广泛应用于加固砂土类地基