摘要
结合港珠澳跨海大桥西人工岛桥隧段软土地基处理工程,通过室内模拟试验,在已知固定水泥掺入比为18%的前提下,开展了水泥土在不同土质(淤泥、淤泥质黏土、粉质黏土)、不同龄期、不同养护环境条件下的力学性能试验。分析了土样的矿物成分、有机质含量,不同养护环境对水泥土无侧限抗压强度的影响规律及水泥的加固机理。结果表明:海水环境下水泥加固效果最好的是粉质黏土,其次是淤泥质黏土,最差的是淤泥;海水环境对3种水泥土的前期增益效果顺序依次是淤泥质黏土、淤泥、粉质黏土,后期增益效果顺序依次是粉质黏土、淤泥、淤泥质黏土。
Aiming at the soft foundation treatment project of bridge tunnel section on the west artificial island,Hong Kong-Zhuhai-Macao Bridge,we carried out physical property tests to study the mechanics characteristics of different cement soils(sludge,sludge clay and silty clay)under the constant cement content at 18%,different curing periods and different curing environments.Based on the test results,we discuss the influence of mineral composition,organic matter content in soil and different curing conditions on the unconfined compressive strength and cement reinforcement mechanism.The results showed that under the seawater environment,the effect of cement reinforcement follows a descend order of silty clay,sludge clay,sludge.The initial-gain effect of sea water environment follows a descend order of sludge clay,sludge,silty clay;and the later-gain effect of sea water environment follows a descend order of silty clay,sludge,sludge clay.
作者
熊营飞
刘洋
滕伟福
XIONG Yingfei;LIU Yang(Three Gorges Research Center for Geo-hazard of Ministry of Education,China University of Geosciences,Wuhan 430074,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)
出处
《人民长江》
北大核心
2018年第17期87-91,共5页
Yangtze River
关键词
水泥土
矿物成分
有机质含量
无侧限抗压强度
cement soil
mineral composition
organic matter content
unconfined compressive strength
