真空联合堆载预压法处理深厚软土试验研究
摘要:针对珠海地区的深厚软基，采用真空联合堆载预压法进行加固处理。在施工过程中对软基的地表沉降、膜下真空度、孔隙水压力、深层水平位移等进行监测，得到了真空预压加固软土地基的随时间变化曲线。软基处理完成后对原状土进行原位十字板剪切试验和载荷试验，并取土进行室内土工试验。监测和检测试验分析表明：加固后土的物理力学性质有了明显提高，地基加固效果较好，其影响深度达到25～30 m，在15～20 m范围内加固效果最为显著; 但真空预压并未改变软土的触变性，加固后的软土仍应避免扰动。
Abstract:In view of the deep soft foundation in Zhuhai,the vacuum combined loading preloading method is used to reinforce the soft foundation.During the construction process,the surface settlement,the vacuum under the membrane,the pore water pressure and the deep horizontal displacement of the soft foundation are monitored,and obtained the time dependent curve of the vacuum preloading to consolidate the soft soil foundation.After the soft foundation treatment was completed,the original soil was subjected to the vane shear tests and the load tests,and laboratory soil tests was also used in the soil.Analysis results show that physical and mechanical properties of reinforcement of the soil have been significantly improved,foundation reinforcement effect is good,the influence depth reaches to 25m~30m,and the reinforcement effect is the most significant in the range of 15 m~20 m; But the vacuum preloading does not change the thixotropy of the soft soil,and the soft soil should still avoid the disturbance after reinforcement.
中文标题：
真空联合堆载预压法处理深厚软土试验研究
Experimental Study on Treatment of Deep Soft Soil by Preloading Combined With Vacuum
作者：
何长明,黎军
He Changming,Li Jun
作者简介:何长明，男，1978年生，汉族，湖南邵阳人，硕士研究生，高级工程师，主要从事岩土及道路工程设计与研究。E-mail：348806358@qq.com
通讯地址：
广州市市政工程设计研究总院有限公司, 广东广州 510060
GuangzhouMunicipalEngineeringDesign&ResearchInstituteCo.,Ltd.,Guangzhou510060,Guangdong,China
中图分类号:TU433
doi:10.3969/j.issn.1007-2993.2019.02.013
出版物：岩土工程技术
收稿日期:2018-09-15
网络出版日期:2021-07-06
关键词:路基,软基处理,真空联合堆载预压法,深厚软土,有效加固深度
Key words:subgrade,soft foundation treatment,preloading combined with vacuum,deep soft soil,effective reinforcement depth
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