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NUMERICAL SIMULATION OF THE PROCESS OF MMP PILING WITH WET- JETTING METHOD
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摘要: 多方位立体双向搅拌桩(MMP桩)是一种改进的水泥搅拌桩地基处理方法。为了研究该工法成桩过程中既有线路地基超孔隙水压力变化,使用有限元软件ABAQUS,建立三维有限元模型,采用Biot固结理论和修正剑桥模型以及现场土性参数试验值,模拟上海近郊某铁路路基加固工程中MMP桩成桩过程,计算得到了成桩过程的超孔压的增长及消散情况以及侧向土压力变化情况。将数值模拟结果与现场实测结果对比,两者变化趋势基本一致,吻合得比较好。
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关键词:
- 多方位立体双向搅拌桩 /
- 湿喷法 /
- 修正剑桥模型 /
- 超孔隙水压 /
- 侧向土压力
Abstract: MMP pile is an improved method of deep mixing cement-soil columns,and driving pile affects the surrounding soil of the pile.By using the finite element software ABAQUS,the process of MMP pile driven at a site near a railway foundation in Shanghai was simulated based on the theory of Biot consolidation and modified Cam-Clay constitutive model.The changes in the excess pore pressure and the lateral earth pressure were obtained.Comparison of computed and measured results in situ showed that the computed excess pore water pressure and lateral earth pressure were consistency with those measured from in situ． -
刘松玉，储海岩，宫能和，等. 双向水泥土搅拌桩机[P]. 中国专利: 2004，10065862. 9，2006-9-13. [2] 刘松玉，席培胜，储海岩，等. 双向水泥土搅拌桩加固软土地基 试验研究[J]. 岩土力学，2007，28(3):560-564. [3] 赵永强. 多方位立体双向搅拌桩施工技术[J]. 施工技术，2009，38(9):44-46. [4] 席培胜，宫能和，储海岩，等. 双向搅拌桩加固软土地基应用研究[J]. 施工技术，2007，36(1): 5-8. [5] Roscoe K H，Burland J B. On the Generalized Stress-Strain Behaviour of Wet Clay[M]. Engineering Plasticity. Cambridge: Cambridge University Press，1968:535-609. [6] Hibbitt，kaslsson ＆ Sorensen，Inc. ABAQUS/Standard User's Manual: Volume Two. California，USA，University of California: Hibbitt，karlsson sorensen，1995. [7] Vesic A S. Expansion of Cavities in Infinite Soil Mass[J]. Journal of Soil Mechanics and Foundation Engineering，ASCE，1972，98 (3):265-290. [8] 徐中华. 上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[D]. 上海: 上海交通大学，2007. -
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