摘要
通过离心模型试验研究软土地基堆载预压固结过程中土体沉降量,并与现场实测数据进行对比验证,离心试验结果与现场实测数据基本一致。研究结果表明堆载预压地基最终沉降量约为2080 mm,堆载322天地基固结度达82%,工后5年地表沉降量为32 mm,其中④2层、③层和②1层沉降量分别为30 mm、75 mm和215 mm,分别占地基总沉降量的9.3%、23.4%和67.2%。塑料排水板+堆载预压处理地基可以有效提高地基强度。采用排水板处理后,Ⅱ层土体不排水强度随深度增加逐渐减小,含水率随深度增加逐渐增大。Ⅱ层表层土体含水率降低达11.6%左右,土体不排水强度提高5倍,底层土体强度提高约2倍,而排水板以下未处理部分含水率未发生明显变化。
The settlement of soil during the preloading consolidation of soft soil foundation is studied by centrifugal model test,and compared with the field measured data.The results of centrifugal test are basically consistent with the field measured data.The results show that the final settlement of the preloaded foundation is about 2080mm,the consolidation degree of the 322 days of foundation is 82%,and the surface settlement of the ground after 5 years is 32mm,including the IV-2,III and II-1 layers.The settlements were 3 cm,7.5 cm and 21.5 cm,respectively,accounting for 9.3%,23.4%and 67.2%of the total settlement of the foundation.The plastic drainage board+the preloading treatment foundation can effectively improve the foundation strength.After treatment with drainage board,the undrained strength of the II layer soil gradually decreases with the increase of depth,and the water content increases with the increase of depth.The water content of the surface layer of the II layer decreased by about 11.6%,the undrained strength of the soil increased by 5 times,and the strength of the bottom soil increased by about 2 times,while the moisture content of the untreated part below the drainage board did not change significantly.
作者
李从保
李从安
Li Congbao;Li Congan(Anhui Transportation Consulting and Design Institute Co.,Ltd.,Road Traffic Energy Conservation and Environmental Protection Technology Transportation Industry R&D Center,Hefei 230088,China;Key Laboratory of Geomechanics and Engineering,Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan 430010,China)
出处
《安徽建筑大学学报》
2019年第6期34-39,共6页
Journal of Anhui Jianzhu University
基金
国家自然科学基金青年基金资助项目(51709017)
长江科学院中央级公益性科研院所基本科研业务费项目(CKSF2017022YT)。
关键词
软土
地基处理
堆载预压
塑料排水板
离心模型试验
soft soil
foundation treatment
preloading
plastic drainage board
centrifugal model test
作者简介
李从保(1986-),男,高级工程师,硕士,从事公路与城市道路及岩土工程设计与研究工作。
