云南蒙自膨胀土胀缩特性试验研究  

EXPERIMENTAL STUDY ON SWELLING-SHRINKAGE CHARACTERISTICS OF EXPANSIVE SOIL IN MENGZI,YUNNAN

作　　者：高昆丽 程芸 高连通 杨廷国 赵永帆 GAO Kun-li;CHENG Yun;GAO Lian-tong;YANG Ting-guo;ZHAO Yong-fan(Yunnan Construction Investment First Survey and Design Co.,Ltd.,Kunming 650000)

机构地区：[1]云南建投第一勘察设计有限公司,云南昆明650000

出　　处：《云南地质》2025年第1期123-127,共5页Yunnan Geology

摘　　要：蒙自膨胀土一系列试验分析研究表明:自由膨胀率与液限﹑塑限存在正相关关系;膨胀率大小与上覆压力、受力历史和吸水时间都有很大关系。上覆压力和超固结过程均可以从一定程度上抑制土体膨胀的发展;膨胀土吸水膨胀、失水收缩,如此循环反复,导致其工程性质不断恶化、衰减,是其致灾的根本原因。A series of experimental studieson expansive soil in Mengzireveal positive correlations between free swelling ratio and liquid/plastic limits.Swelling ratio correlates significantly with overburden pressure,stress history,and water absorption duration.Both overburden pressure and overconsolidation process effectively inhibit soil expansion.Repeated swelling-shrinking cycles deteriorate its engineering properties,constituting the fundamental disaster mechanism.

关 键 词：膨胀土 胀缩变形特征 上覆压力 受力历史 裂隙 云南蒙自 

分 类 号：TU435[建筑科学—岩土工程]