河津黄土地基湿陷变形试验研究  

Experimental Study on the Regularities of Collapsible Deformation of Loess Foundation in Hejin, Shanxi

作　　者：钱鸿缙[1] 朱梅[1] 谢爽[1] 

机构地区：[1]西安冶金建筑学院,710055

出　　处：《岩土工程学报》1992年第6期1-9,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金;冶金部教育司基础理论研究基金资助课题。

摘　　要：本文通过大量的室内外试验,包括三个大面积试坑浸水试验以及三个天然地基和强夯地基上的浸水载荷试验,详细讨论了黄土地基自重湿陷变形和外荷湿陷变形的规律;探讨了《湿陷性黄土地区建筑规范(TJ25-78)》中有关湿陷性黄土场地湿陷类型的评判方法;根据试坑浸水试验结果,认为原勘察报告对场地湿陷类型的判定有误,应为非自重湿陷性场地;在按计算自重湿陷量评判时,应乘以调整系数m_0;采用模糊数学方法,对自重湿陷敏感性进行了综合评判,并提出了评判指标β和分档标准,试验及计算简便,可靠度达90％以上;通过非线性有限元分析,湿陷量计算值与实测值还较接近。In order to study the deformation characteristics of collapsible loess foundation in South Shanxi, a series of laboratory and in-situ tests which included three in-situ ponding tests (12m × 12m, 15m × 15m and 20m × 20m) and three in-situ ponding plate loading tests were carried out. The results from ponding tests showed that the type of collapse in-situ indicated in the engineering investigation report was erroneously judged and the site should be non-self-subsiding. The regularities of collapsible deformation of loess foundation and the evaluation of the type of collapse suggested in the Chinese Regulation on Building Construction in Regions of Collapsible Loessic Soils (TJ25-78) are discussed, and a modified coefficient m,, is suggested. By using fuzzy mathematics, a synthetic judgement for sensitivity to self-subsidence is given, and an index as well as the sensitivity criterion is also proposed. This method is easy and has high reliability. The collapsible deformation of collapsible loess foundation is calculated by non-linear finite element method. The calculated values agreed with the measured values.

关 键 词：湿陷性 黄土地基 变形 试验 

分 类 号：TU475.3[建筑科学—结构工程]