真空预压联合间歇式加热排水固结法加固软黏土模型试验研究  

Experimental study on consolidation by vacuum preloading combined with intermittent heating

作　　者：郑良科 郑荣跃[1] 邓岳保[1] 王天园 毛伟赟 ZHENG Liang-ke;ZHENG Rong-yue;DENG Yue-bao;WANG Tian-yuan;MAO Wei-yun(Faculty of Architectural Engineering, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China)

机构地区：[1]宁波大学土木与环境工程学院,宁波315211

出　　处：《水道港口》2020年第6期713-719,共7页Journal of Waterway and Harbor

基　　金：国家自然科学基金(E080601);宁波市自然科学基金项目(2019A610398);宁波大学SRIP项目基金(2020SRIP1405)。

摘　　要：针对滨海地区软黏土含水量高、压缩性大、抗剪强度低的特点,提出真空预压联合间歇式加热排水固结的新型软基加固技术。首先利用改装后的固结装置开展模型试验,监测软土地基加固过程中的真空度、沉降、孔压和温度变化过程。预压结束后,测试模型地基土体的物理力学特性参数,对比不同加固方法的处理效果。结果表明:采用间歇式加热真空预压沉降量比常规真空预压沉降量大,比持续加热的真空预压沉降量略小;间歇式加热真空预压法处理后的土体含水率明显降低;真空预压联合间歇加热技术有利于降低土体流变性,增强土体稳定性,具有一定的经济性,因此推荐在实际工程中应用。In view of the characteristics of high clay content,large compressibility and low shear strength of Ningbo soft clay,a new idea of combining vacuum preloading with intermittent heating and drainage consolidation was proposed.The vacuum degree,settlement,pore pressure and temperature,water content and consolidation coefficient of the soil after the test were monitored by using self-made stainless steel model bucket.Experimental results show that the settlement of vacuum preloading by intermittent heating is larger than that by conventional vacuum preloading,and slightly smaller than that by continuous heating;The moisture content of soil is obviously reduced after vacuum preloading;intermittent heating is beneficial to reduce soil rheology and enhance soil stability,so it is recommended to be applied in practice.

关 键 词：软粘土地基 间歇式加热 真空预压 固结 能耗 

分 类 号：U65[交通运输工程—港口、海岸及近海工程] TU43[交通运输工程—船舶与海洋工程]