(1 兰州有色冶金设计研究有限公司， 兰州 730000； 2 甘肃土木工程科学研究院， 兰州 730022)

［摘要］在兰州市榆中县和平镇38～42m厚自重湿陷性黄土场地上，做直径20m圆形试坑的现场浸水试验，试验持时69d，其中浸水观测62d、停水后观测7d，总用水量4 346m3。重点考察了湿陷性黄土的湿陷范围、湿陷速率变化规律及裂缝发展规律。试验结果表明，湿陷性黄土的湿陷有一定范围，15m以下沉降量较小，渗透最大影响深度约为25m，且大厚度自重湿陷性黄土湿陷范围呈先局部后整体，先近后远，近密远疏，逐步扩展的变化规律。

［关键词］自重湿陷性黄土；浸水试验；湿陷范围；沉降量

中图分类号：TU413-4 文献标识码：A文章编号：1002-848X(2021)15-0131-04

 Water immersion test study on collapsible range of strong self-weight collapsible loess 

CHEN  Tianlei1,  LI  Xudong1,  LU  Haitao2,  CAI  Mingxi1 

(1 Lanzhou Engineering & Research Institute of Nonferrous Metallurgy Co., Ltd., Lanzhou 730000， China；2 Gansu Civil Engineering Research Institute Co., Ltd., Lanzhou 730022， China) 

Abstract: On-site water immersion test of a 20m diameter test pit was carried out on a 38~42m thick self-weight collapsible loess site in Heping town, Yuzhong county, Lanzhou city. The test lasted for 69 days, including 62 days of immersion observation and 7 days of observation after water stoppage. The total water consumption is 4 346m3. The collapsible range of collapsible loess, the variation law of collapsible rate and the law of crack development were mainly investigated. The experimental results show that the collapsible loess has a certain collapsible range, the subsidence is small below 15m, and the maximum penetration depth is about 25m. The collapsible range of large-thickness self-weight collapsible loess shows a changing law of local first and then the whole, near first and then far, near dense and far sparse, and gradually expanding.  

Keywords:self-weight collapsible loess； water immersion test； collapsible range； subsidence

*甘肃省科技计划资助项目（18YF1GA055）。

 作者简介：陈天镭，双学士，教授级高级工程师，Email:1327984377@qq.com。