南京林业大学学报（自然科学版）2017，Vol.41Issue(2)：136-142,7.DOI:10.3969/j.issn.1000-2006.2017.02.020
水泥改良土融沉对地层位移场影响的数值分析
Numerical analysis of the influence of cemented soil thawing settlement on the stratum displacement field
摘要
Abstract
[Objective] Research on the influence of cemented soil thawing settlement on the stratum displacement field can provide a theoretical basis for the application of cemented soil freezing methods in urban underground engineering.[Method]Taking the shield tunneling horizontal freezing reinforcement project in Nanjing metro line 10 as an example, a 3-D numerical simulation analysis is conducted on the stratum displacement field caused by the cemented soil thawing settlement. The effect of the thaw settlement coefficient, thickness of the covering soil, and size of the frozen soil wall on the cemented soil displacement field are studied using the single factor analysis. It was found from research that the a?mount of maximum surface thawing settlement is 12.811 cm as the frozen soil had not improved;when the cement?mixed ratio is increased to 12%, the maximum surface thawing settlement amount reduces to 1.521 cm, revealing that mixing of cement can significantly decrease the thawing settlement of the frozen soil. [Conclusion] In the freezing thawing settle?ment of the cement soil, the deeper the soil is, the larger the thawing settlement displacement is and the smaller the tha?wing settlement range is. The surface thaw displacement shows a basin shaped settlement, with the maximum settlement displacement located at the outlet. With the increase in the thawing settlement coefficient, the amount of maximum sur?face settlement increases gradually, but the soil displacement distribution does not change; the larger the covering soil thickness, the smaller is the surface settlement. When the frozen wall size is increased, the rate of development of sur?face displacement decreases;thus, the surface settlement time increases, and finally the thaw displacement increases.关键词
水泥改良土/融沉/地层位移场/数值模拟Key words
cement soil/thawing settlement/ground displacement field/numerical simulation分类
交通工程引用本文复制引用
王效宾,杨平,胡俊..水泥改良土融沉对地层位移场影响的数值分析[J].南京林业大学学报（自然科学版）,2017,41(2):136-142,7.基金项目
住房和城乡建设部科技项目(2016-K5-060) （2016-K5-060）
国家自然科学基金项目(51278251) （51278251）
