摘要
基于降雨前后墙体含水率不同,且降雨往往伴随风砂天气的条件设计了相关试验,模拟墙体在降雨前后不同含水率下的抗风蚀能力,探讨土遗址在蚀变过程中与特定环境的关系.结果表明,含水率增加会使土体试样表面的硬度呈线性降低,直接导致土体试样表面抗风蚀能力减弱,但二者的关系并不是线性的,同一风速下,视风蚀速率随着含水率的升高先增加后降低,随表面硬度的降低先增加后下降;视风蚀速率与含水率大致呈二次函数的关系;当含水率不变时,视风蚀速率在低风速阶段随风速变化的增幅较低,在高风速阶段,视风蚀速率随风速变大的幅度较大,视风蚀速率与风速大致呈二次函数的变化关系.
The water content in the wall is different in the progress of a rainfall,and the progress is often accompanied by wind that carries with much sand.Based on this situation,some experiments were designed to simulate the wind erosion resistance of the wall under different water contents before and after rainfall,in order to explore the relationship between the earthen sites and the specific environment during the changing process.The test showed that,at a same wind speed,the surface hardness of the sample decreased linearly when the water content increased,and then the decrease of hardness directly led to the weakening of the wind erosion resistance of the soil sample surface,but the relationship between the wind erosion resistance and the hardness was not in a linear fashion.The rate of wind erosion increased first and then decreased with the increase of water content,and as well as with the decrease of surface hardness;there was a nearly quadratic function between the wind erosion rate and the water content.There was a quadratic relationship between the wind erosion rate and wind speed when the water content was constant.At a low wind speed stage,the wind erosion rate increased slowly with the change of wind speed,but at a high wind speed stage the rate increase of the wind erosion was fast.
作者
谌文武
夏云云
杜昱民
陈浩鑫
Chen Wen-wu;Xia Yun-yun;Du Yu-min;Chen Hao-xin(Key Laboratory of Mechanics on Disaster and Environment in Western China with the Ministry of Education,College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第6期793-798,共6页
Journal of Lanzhou University(Natural Sciences)
基金
嘉峪关丝路(长城)文化研究院研究(二期)项目(170299)
国家科技支撑计划项目(2014BAK16B02)
关键词
土遗址
含水率
风速
风蚀
earthen site
water content
wind speed
wind erosion
作者简介
通信联系人:谌文武(1966-),男,河南罗山人,教授,博士,博士研究生导师,e-mail:sungp@lzu.edu.cn,研究方向为地质工程、岩土工程、文物保护工程
