堆积体骨料比及土壤含水率对其稳定性影响的试验研究  

Experimental Study on Effects of Aggregate Ratio and Soil Moisture Content on Stability of Accumulation Body

作　　者：林泽雨 何卓名 张巍[1] 刘爱华[1] LIN Zeyu;HE Zhuoming;ZHANG Wei;LIU Aihua(College of Water Conservancy and Civil Engineering,South China Agriculture University,Guangzhou 510642,China)

机构地区：[1]华南农业大学水利与土木工程学院,广东广州510642

出　　处：《防灾减灾工程学报》2020年第6期984-991,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：广东省水利厅科技创新重点项目(2017-30);广东省自然科学基金项目(2018A030310346)资助。

摘　　要：堆积体失稳是较常见的滑坡灾害之一。以鹅卵石、碎石、南方红土为材料组成的堆积体为研究对象,通过测量堆积体临界坡度,分析了堆积材料组成比例及土壤含水率对其稳定性的影响。结果表明:(1)就堆积坡度而言,不同堆积坡度材料之间存在最不利组合(在单独堆积坡度较低的材料占比为80%时堆积体的临界坡度最低);(2)堆积体中含土率对堆积体临界坡度存在先减后增的影响,当含土率为20%时堆积体坡度最小;(3)堆积体中土壤的含水率对堆积体临界坡度存在先增后减的影响,当土壤含水率超过30%时负面影响明显;(4)混凝土流变仪测试得到的堆积材料的流动屈服应力与试验材料堆积稳定性存在正相关规律。The failure of accumulation bodies is one of the common landslide disasters.An accumula⁃tion body comprising pebbles,gravels and southern red soil was taken as the research object.By mea⁃suring the critical slope of the accumulation body,the effect of the composition proportion and soil moisture content on the stability of the accumulation body was analyzed.The results show that:1)In terms of accumulation slope,there is a most unfavorable deposit material constitution(the critical slope of the accumulation body is the lowest when the proportion of materials with lower deposit slope is 80%);2)The critical slope of the accumulation body first decreases and then increases with the in⁃crease of soil content,reaching a minimum value at a soil content of 20%;3)The critical slope of the accumulation body first increases and then decreases with the increase of moisture content,and the negative effect is obvious when the moisture content exceeds 30%;4)There is a positive correlation between the flow yield stress and the deposit stability of the test material according to the test results of RHEOCAD.

关 键 词：边坡稳定性 堆积体 临界坡度 土壤含水率 流变仪 

分 类 号：P642[天文地球—工程地质学]