摘要
水泥加固是有效且常用的土体加固方法之一。工程上采用无侧限抗压强度衡量土体加固效果,但是由于土体加固后的强度受多种因素的复杂影响,目前尚无统一的方法可以合理表征和预测土体经水泥加固后的强度。本研究利用土单元体试验方法,研究了含水量对于水泥加固含细粒砂土强度的影响,建议采用“水胶比”用于水泥加固含黏粒砂土的配合比设计;还研究了含水量对加固后砂土的剪切波与超声波速的影响,利用剪切波和超声波速表征加固后土体的无侧限抗压强度,且该经验关联基本不受含水量、水灰比、水泥掺入比和养护龄期的影响,可以用于现场强度检测和监测。最后,对含水量影响水泥加固土体强度的机理进行了探讨。
Cement stabilization is a useful and widely adopted method for ground improvement.However,there is no commonly accepted method to characterize and predict the unconfined compressive strength,which is a primary design parameter,due to complicated interactions of various factors.This study investigated the effects of water content on the unconfined compressive strength of cement-stabilized clayey sands,and suggested a concept of“water-to-bonding ratio”for the dosage design of cement stabilization of clayey sands.This study also investigated the effects of water content on the ultrasonic wave velocity and shear wave velocity of cemented clayey sands.The unconfined compressive strength can be correlated with shear wave velocity and ultrasonic wave velocity regardless of water content,water-to-cement ratio,cement content,and curing time.These correlations would be useful for in-situ prediction and monitoring of strength development.The mechanism of the effects of water on the unconfined compressive strength is also discussed.
作者
魏骁
KU Taeseo
杨仲轩
WEI Xiao;KU Taeseo;YANG Zhong-xuan(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,Zhejiang,China;Department of Civil and Environmental Engineering,National University of Singapore,119077,Singapore;Department of Civil and Environmental Engineering,Konkuk University,Seoul 05029,South Korea)
出处
《地基处理》
2022年第S01期6-13,共8页
Journal of Ground Improvement
基金
浙江省自然科学基金项目(LQ22E080012)
中央高校基本科研业务费专项资金(2021QNA4021)
关键词
水泥加固
含黏粒砂土
强度
波速
含水量
细粒含量
cement stabilization
clayey sand
strength
wave velocity
water content
fines content
作者简介
魏骁(1990—),男,重庆人,博士,特聘副研究员,从事岩土工程领域的试验与理论研究。E-mail:weixiaos@zju.edu.cn。
