摘要
按照真空预压规范设计的吹填土固结时间,经常发生吹填土固结度达不到设计要求。规范是根据井径比对固结系数进行折减来考虑吹填土固结特性,而吹填土的固结特性会受到加固过程中土体的孔隙比、渗透系数、压缩系数等因素随时间变化的影响。针对工程中出现的问题,结合模型试验的结果以及对土体的固结特性进行研究,用差分法对土体的固结情况进行数值计算。经与试验结果和差分法模拟结果对比,验证了方法的合理性,可作为实际工程的借鉴。
In engineering practice, when using the vacuum preloading technique to improve the hydraulic filled slurry, the consolidation degree usually cannot reach the expected value calculated by the current design code in China within the construction period. In the current design code, the consolidation behavior of the slurry is considered by discounting the consolidation coefficient. The observed data show that the consolidation procedure is influenced by several factors, such as the void ratio, permeability and compressibility. Practical engineering problems are discussed combined with the results of model tests by using the finite difference method. The test data agree well with the numerical calculation, indicating that the proposed numerical method is reasonable and can be used to guide the practical design.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期496-500,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金面上项目(41272323)
天津市重点项目基金(11JCZDJC23900)
关键词
真空预压
巴隆理论
变固结系数
有限差分法
vacuum preloading
Barron's theory
variable consolidation coefficient
finite difference method
