群孔效应对周边环境影响的控制措施研究  

Research on Control Measures of Influence of Borehole Group on Surrounding Environment

作　　者：郑刚[1,2] 李溪源 王若展 程雪松[1,2] 张涛[1,2] 王凡俊[1,2] Zheng Gang;Li Xiyuan;Wang Ruozhan;Cheng Xuesong;Zhang Tao;Wang Fanjun(Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin 300072,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]滨海土木工程结构与安全教育部重点实验室,天津300072 [2]天津大学建筑工程学院,天津300072

出　　处：《石家庄铁道大学学报（自然科学版）》2020年第2期8-15,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(51508382);天津市自然科学基金(18JCQNJC07900)。

摘　　要：在软土地区进行桩基施工时会留下大量空孔,工程案例及已有研究表明,当群孔大量存在时,其对周边环境可能造成的影响相当可观,但减小其影响的措施却尚未得到系统研究。利用Plaxis 3D有限元软件对群孔效应进行了探索分析,针对群孔效应对周边环境的影响,提出了几种较为经济有效的控制措施,包括在桩基施工前提前施工围护结构、提前施工第一道支撑及空孔回填。提前施工围护结构对控制群孔效应对周边环境的影响具有显著效果,提前施工第一道支撑,可以进一步增加围护结构的抗侧移刚度,大幅度减小围护结构的水平变形;采用空孔回填措施时,回填整个群孔区域外围一定排数空孔即可起到较好的效果。实际工程中,上述几种控制措施可根据实际情况综合使用。A large amount of hollow boreholes are left after the construction of piles if piles are utilized as the foundations of buildings.Engineering cases and previous research show that a large number of hollow boreholes have considerably influence on the surrounding environment.However,the measures to reduce the influence have not been systematically studied.In this paper,the mechanism of borehole-group effect is investigated using Plaxis 3 D.To alleviate the response of the surrounding environment induced by the borehole-grout effect,several economical and effective control measures are proposed,including the pre-construction of retaining structures,pre-construction the first level of struts and backfilling hollow holes after the construction of the pile foundation.To be specific,the pre-construction of retaining structures has a significant effect on the influence of the control borehole grout effect on the surrounding environment.In addition,pre-construction of the first level of struts can greatly increase the lateral stiffness of retaining structures and further reduce the horizontal deformation of retaining structures.Backfilling a certain number of rows of hollow holes can also result in a considerable effect.In the engineering,the above several control measures can be used comprehensively according to the practical situation.

关 键 词：软土 桩基施工 CFG桩施工 群孔效应 控制措施 

分 类 号：TU47[建筑科学—结构工程]