循环变温条件下滨海软土热固结特性测试研究  

Test on thermal consolidation characteristics of coastal soft soil under cyclic varying temperature

作　　者：曹光形 邓岳保 李红军 毛伟赟 CAO Guangxing;DENG Yuebao;LI Hongjun;MAO Weiyun(Institute of Geotechnical Engineering,Ningbo University,Ningbo 315211,China;Zhejiang Real Estate Division,Greenland Holding Group,Hangzhou 310015,China)

机构地区：[1]宁波大学岩土工程研究所,浙江宁波315211 [2]绿地浙江事业部,浙江杭州310015

出　　处：《中国测试》2022年第8期170-176,共7页China Measurement & Test

基　　金：浙江省自然科学基金项目(LGG21E080005)。

摘　　要：随着滨海地区能源岩土工程的兴起与发展,测试分析循环变温条件下滨海软土的力学特性具有重要的研究价值。首先介绍国内自主研制的土体温控固结测试仪,给出温度校核、测试方法和注意事项。基于该仪器测试典型滨海软土在循环变温条件下的热固结特性,详细分析排水条件循环变温过程中软土的孔压消散和沉降变化过程。研究表明:在荷载相同时,土体孔压和沉降回弹随温度升高而逐渐增大,且循环变温引起的累积孔压、累积沉降随循环次数增加而增大,但沉降增加趋势随循环次数增加而变缓;降温时,不同荷载情况下孔压消散速率随循环次数不同而不同,但沉降下降速率与循环次数无关。With the rise and development of energy geotechnical engineering in coastal areas,testing and analyzing the mechanical properties of coastal soft soils under cyclic variable temperature conditions has important research value.Firstly,the domestically developed soil temperature control consolidation tester,including hardware system and software system,is introduced,and the temperature check,test methods and precautions are given.Based on this instrument,the thermal consolidation characteristics of typical coastal soft soils under cyclic temperature changes are tested,and the pore pressure dissipation and settlement changes of the soil during the cyclic temperature changes are analyzed in detail.Studies have shown that:under the same load,the pore pressure and soil settlement rebound gradually increase with the increase of temperature,and the cumulative pore pressure and cumulative settlement caused by cyclic temperature change increase with the increase of the number of cycles,but the increasing trend of settlement slows down with the increase of the number of cycles.When the temperature is lowered,it is different under load,the dissipation rate of pore pressure varies with the number of cycles,but the rate of sedimentation decline is almost unchanged,regardless of the number of cycles.

关 键 词：温控固结仪 软土 循环变温 孔压 沉降 

分 类 号：TU43[建筑科学—岩土工程]