CAJ | 학술논문

强夯与静载是加固地基的两种方式,但其作用的机理与过程是不同的. 为了对比分析两种作用下地基土体的加固效果,考虑土体的材料与几何非线性,采用FLAC3D 程序,建立强夯冲击和静载作用下地基的数值模型,对比分析地基土体内部位移场、应力场及密度等参数的变化规律. 结果表明:产生相同的地表坑深所需的冲击应力峰值要明显高于所需的静载数值,冲击作用的竖向应力和竖向位移衰减快于静载作用, 静载作用有效加固深度和地表加固宽度均要要大于冲击作用,冲击作用加固效果在浅层弱于静载作用、中部高于静载、深部两者趋同. 研究成果深化了强夯与静载作用时地基内部响应的认识,探讨了分析强夯等动力荷载加固地基效果的新途径.
강항여정재시가고지기적량충방식,단기작용적궤리여과정시불동적. 위료대비분석량충작용하지기토체적가고효과,고필토체적재료여궤하비선성,채용FLAC3D 정서,건립강항충격화정재작용하지기적수치모형,대비분석지기토체내부위이장、응력장급밀도등삼수적변화규률. 결과표명:산생상동적지표갱심소수적충격응력봉치요명현고우소수적정재수치,충격작용적수향응력화수향위이쇠감쾌우정재작용, 정재작용유효가고심도화지표가고관도균요요대우충격작용,충격작용가고효과재천층약우정재작용、중부고우정재、심부량자추동. 연구성과심화료강항여정재작용시지기내부향응적인식,탐토료분석강항등동력하재가고지기효과적신도경.
Dynamic compaction and static load are two methods of ground stabilization, but their action mechanisms and processes are different. In order to analyze the consolidation effect of foundation soil under the two kinds of loads, the material and geometrical nonlinearity of the soil was taken into account, the FLAC3D program was adopted, the numerical model of foundation under the two kinds of loads was established, the change law of displacement field, stress field and density in the foundation soil was contrastively analyzed. Results show that the impact stress peak is apparently higher than that of the static load if they lead to the same pit depth; the attenuation velocity of the vertical stress and vertical stress of the impact effect are faster than that of the static load; the effective reinforced depth and breadth of the static load are greater than that of the impact effect; compared with the static load, the impact effect has a weaker consolidation effect in the superficial layer of the foundation, and greater in the middle layer, the same in the deep layer. Research results deepen the knowledge of the response in the foundation under the dynamic compaction and static load, and discuss a new way of analyzing the consolidation effect of the foundation under the dynamic compaction.