强降雨作用下强风化泥岩降雨入渗特性试验研究

›› 2014, Vol. 35 ›› Issue (10): 2755-2760.

强降雨作用下强风化泥岩降雨入渗特性试验研究

陈洪凯¹，唐红梅¹，唐云辉²，谭玲¹，魏来¹，何晓英¹，高阳华²

1. 重庆交通大学岩土工程研究所，重庆 400074；2. 重庆市气象科学研究所，重庆 401147

收稿日期:2013-06-13 出版日期:2014-10-11 发布日期:2014-10-27
作者简介:陈洪凯，男，1964年生，博士后，教授，博士生导师，从事西部交通地质减灾理论与技术研究。
基金资助:
国家科技攻关项目(No. GYHY201006039)；国家自然科学基金项目(No. 41071017)；2013年重庆高校创新团队建设计划资助项目(No. KJTD20 1305)；重庆市“两江学者”计划专项经费资助。

Experimental study of infiltration characteristics of strongly weathered mudstone under action of heavy rainfall

CHEN Hong-kai¹，TANG Hong-mei¹，TANG Yun-hui²，TAN Ling¹，WEI Lai¹，HE Xiao-ying¹，GAO Yang-hua²

1. Institute of Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. Chongqing Institute of Meteorological Sciences, Chongqing 401147, China

Received:2013-06-13 Online:2014-10-11 Published:2014-10-27

摘要/Abstract

摘要： 土体降雨入渗特性是实施坡面泥石流和土体滑坡发育过程研究的重要因素。研制了人工降雨土柱入渗试验装置，实施了10、20、30、40、50、60 mm/h共6种降雨强度下强风化泥岩的入渗试验，最长降雨历时105 min。试验结果表明：可将土体入渗过程可分为无压入渗、有压入渗和饱和入渗3阶段，其中土体的入渗率在无压入渗阶段和饱和入渗阶段均随降雨历时增长近似为常数，在有压入渗阶段则快速降低；通过定义降雨作用下土体入渗锋，包括初始入渗锋和终止入渗锋，分析了入渗锋所处位置随降雨强度的变化关系，初始入渗锋和终止入渗锋之间的幅值随降雨强度的增大而变宽；提出了可表征重庆地区侏罗系强风化泥岩入渗过程的土体降雨入渗公式。研究成果对于构建重庆地区降雨诱发型滑坡及坡面泥石流的预测预报模型有积极意义。

关键词: 岩土力学, 入渗特性, 强风化泥岩, 试验, 人工降雨

Abstract: The infiltration characteristics of soil under the action of heavy rainfall is an important part to study the developing process of landslide debris flow and soil landslide. A soil cylinder experimental facility for infiltration test under artificial rainfall is prepared to do infiltration test for strongly weathered mudstone under six rainfall intensities, i.e. 10, 20, 30, 40, 50 and 60 mm/h, and the longest rainfall duration is 105 minutes. Three conclusions are drawn as follow. Firstly, the infiltration process can be divided into non-compressive infiltration, compressive infiltration, and saturated infiltration stages. Meanwhile, the infiltration rate will close to be a constant along the rainfall duration in the non-compressive infiltration and saturated infiltration stages, and it will reduce quickly in compressive infiltration stage. Secondly, the infiltration interface in the soil is defined as infiltration front, and it contains original infiltration interface and final infiltration interface. Then, the relation is discussed between the depth of infiltration front and rainfall intensity, the bigger the rainfall intensity is, the bigger the amplitude between two infiltration interfaces is. Thirdly, a rainfall infiltration formula is built to express the infiltration process of Jurassic strong weathering mudstone in Chongqing city. The results have positive effect for the study of constructing the forecasting model of rainfall-induced type landslide and slope debris flow in Chongqing city.

Key words: geotechnical mechanics, infiltration characteristics, strongly weathered mudstone, test, artificial rainfall

中图分类号:

P 642.1

陈洪凯，唐红梅，唐云辉，谭玲，魏来，何晓英，高阳华,. 强降雨作用下强风化泥岩降雨入渗特性试验研究[J]. , 2014, 35(10): 2755-2760.

CHEN Hong-kai ，TANG Hong-mei ，TANG Yun-hui ，TAN Ling ，WEI Lai ，HE Xiao-ying ，GAO Yang-hua . Experimental study of infiltration characteristics of strongly weathered mudstone under action of heavy rainfall[J]. , 2014, 35(10): 2755-2760.

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