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STUDY ON THE SETTLEMENT RATE STANDARD FOR DETERMINING THE SURCHARGE REMOVAL TIME FOR EMBANKMENT ON SOFT GROUND
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摘要: 软土地基上的路基施工常采用沉降速率法确定超载卸荷时间。现有的沉降速率法主要依据地方经验沉降速率标准,无法与获得的工后沉降相联系。基于分级加荷条件下地基固结度计算的改进太沙基公式,推导出超载沉降速率与等载工后沉降间的关系式,据此建立按容许工后沉降控制的超载预压卸荷沉降速率标准。有限元数值模拟分析表明,相对于地方经验沉降速率标准过于严格,该沉降速率标准卸荷控制的工后沉降满足规范要求。通过应用于实际工程,给出了超载卸荷时间。Abstract: Settlement rate method is often used to decide surcharge removal time for embankment on soft ground.Post-construction settlements controlled by empirical settlement rate standards used in some highways can not be obtained.A equation that describes the relationship between settlement rate during surcharge preloading and the post-construction settlements is derived by means of Terzaghi's consolidation theory for multistage loading.The settlement rate standards relevant to the allowed post-construction settlements are presented based on this equation.Numerical simulation analysis shows that the post-construction settlements controlled by the regional empirical settlement rate standards are much more less than the allowed values,the settlements controlled by the proposed settlement rate standards meet the requirement of specifications.Finally,one case history is analyzed to verify the use of the proposed standards.
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[2] 刘吉福,陈新华.应用沉降速率法计算软土路堤剩余沉降[J].岩土工程学报,2003,25(2):233-235. JTG D302004公路路基设计规范[S]. [3] 钟才根,张序.高速公路软基路堤沉降速率控制[J].苏州城建环保学院学报,2001,14(4):48-53. [4] 陈道志,陈东升.软土路基超载设计与卸荷时机的确定[J].中南公路工程,2004,29(1):66-69. [5] 刘吉福,莫海鸿.对沉降速率法确定卸载时机的认识[J].岩石力学与工程学报,2007,26(增1):3065-3072. [6] 刘吉福,庞奇.沉降速率系数确定方法[J].中山大学学报:自然科学版,2007,46(3):35-38. [7] JTJ 01796公路软土地基路堤设计与施工技术规范[S]. [8] 《地基处理手册》编委会.地基处理手册[M].2版.北京:中国建筑工业出版社,2000. -
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