压实黄土强度特性影响因素的试验研究
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摘要
为研究击实能和含水率对压实黄土强度特性的影响,以延安新区某高填方填筑土为研究对象,采用应变控制式直剪仪,将不同含水率、击实能作用下的压实土样分别在垂直压力为100、200、300和400 k Pa下进行直剪试验。试验结果表明:击实能的增大并不能保证土体强度的提高,还要考虑最优含水率的影响;当含水率较低时,抗剪强度随击实能的增大而提高;当含水率较高时,抗剪强度随击实能的增大而降低。黏聚力和内摩擦角表现与抗剪强度相同的变化规律。试验结果可为公路、路基及建筑物地基的填筑施工提供依据。
In order to study the effect of compaction energy and water content on the strength characteristics of compacted loess,a high-filled soil in Yan'an new area was taken as the research object,and the strain-controlled direct shear instrument was used to treat different water content and compaction energy. Compacted soil samples were tested for direct shear at vertical pressures of 100,200,300 and 400 k Pa. The test results show that the increase of compaction energy does not guarantee the improvement of soil strength,but also the influence of optimal water content. when the water content is low,the shear strength increases with the increase of compaction energy;When the water content is high,the shear strength decreases as the compaction energy increases. The cohesion and internal friction angles have the same variation as the shear strength. The test results can provide a basis for the filling of roads,roadbeds and building foundations.
In order to study the effect of compaction energy and water content on the strength characteristics of compacted loess,a high-filled soil in Yan'an new area was taken as the research object,and the strain-controlled direct shear instrument was used to treat different water content and compaction energy. Compacted soil samples were tested for direct shear at vertical pressures of 100,200,300 and 400 k Pa. The test results show that the increase of compaction energy does not guarantee the improvement of soil strength,but also the influence of optimal water content. when the water content is low,the shear strength increases with the increase of compaction energy;When the water content is high,the shear strength decreases as the compaction energy increases. The cohesion and internal friction angles have the same variation as the shear strength. The test results can provide a basis for the filling of roads,roadbeds and building foundations.
引文
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8 王林浩,白晓红,冯俊琴.压实黄土状填土抗剪强度指标的影响因素探讨[J].岩土工程学报,2010,32(增刊2):132-135Wang Linhao,Bai Xiaohong,Feng Junqin. Discussion on influencing factors of shear strength index of compacted loess filled soil[J]. Journal of Geotechnical Engineering,2010,32(S2):132-135
9 张志权,井彦林,孔德泉.压实黄土直剪强度试验研究[J].铁道建筑,2016(12):69-71Zhang Zhiquan,Jing Yanlin,Kong Dequan. Experimental study on direct shear strength of compacted loess[J]. Railway Engineering,2016(12):69-71
10 李柯君,任伟新,钱叶琳,等.击实能对击实试验结果影响的探讨[J].土工基础,2016,30(3):324-327Li Kejun,Ren Weixin,Qian Yelin,et al. Discussion on the influence of compaction on the results of compaction test[J]. Soil Engineering and Foundation,2016,30(3):324-327
2 曹晓毅,李萍.含水量对晋西黄土抗剪强度影响的试验[J].煤田地质与勘探,2014,42(5):77-80Cao Xiaoyi,Li Ping. Experiment on the effect of water content on the shear strength of Jinxi Loess[J]. Coalfield Geology and Exploration,2014,42(5):77-80
3 王娟娟,张秀丽,王铁行.考虑含水量和密度影响的压实黄土抗剪强度特性研究[J].西安建筑科技大学学报(自然科学版),2014,46(5):687-691Wang Juanjuan,Zhang Xiuli,Wang Tiexing. Study on shear strength characteristics of compacted loess considering influence of watercontent and density[J]. Xi'an Journal of Building Science(Natural Science),2014,46(5):687-691
4 贾亮,朱彦鹏,朱鋆川.兰州马兰、离石压实黄土抗剪强度影响因素探讨[J].岩土工程学报,2014,36(增刊2):120-124Jia Liang,Zhu Yanpeng,Zhu Xichuan. Discussion on factors affecting shear strength of compacted loess in Lanzhou Malan and sediment[J]. Journal of Geotechnical Engineering,2014,36(S2):120-124
5 郭江涛.新疆伊犁非饱和黄土的直剪性能试验研究[J].水利与建筑工程学报,2014,12(4):129-132,142Guo Jiangtao. Experimental study on direct shear behavior of unsaturated loess in Yili,Xinjiang[J]. Journal of Water Resources and Architectural Engineering,2014,12(4):129-132,142
6 张沛然,黄泽,杨帆,等.重塑黄土抗剪强度研究[J].山西建筑,2014,40(29):71-73Zhang Peiran,Huang Ze,Yang Fan,et al. Study on shear strength of remolded loess[J]. Shanxi Architecture,2014,40(29):71-73
7 杨晶,白晓红,王林浩,等.基于不同初始含水量的压实黄土力学特性试验研究[J].太原理工大学学报,2012,43(6):669-673Yang Jing,Bai Xiaohong,Wang Linhao,et al. Experimental study on mechanical properties of compacted loess based on different initial moisture contents[J]. Journal of Taiyuan University of Technology,2012,43(6):669-673
8 王林浩,白晓红,冯俊琴.压实黄土状填土抗剪强度指标的影响因素探讨[J].岩土工程学报,2010,32(增刊2):132-135Wang Linhao,Bai Xiaohong,Feng Junqin. Discussion on influencing factors of shear strength index of compacted loess filled soil[J]. Journal of Geotechnical Engineering,2010,32(S2):132-135
9 张志权,井彦林,孔德泉.压实黄土直剪强度试验研究[J].铁道建筑,2016(12):69-71Zhang Zhiquan,Jing Yanlin,Kong Dequan. Experimental study on direct shear strength of compacted loess[J]. Railway Engineering,2016(12):69-71
10 李柯君,任伟新,钱叶琳,等.击实能对击实试验结果影响的探讨[J].土工基础,2016,30(3):324-327Li Kejun,Ren Weixin,Qian Yelin,et al. Discussion on the influence of compaction on the results of compaction test[J]. Soil Engineering and Foundation,2016,30(3):324-327
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