| 张慎强,朱首军,刘玉兰.重粉质黄土淤地筑坝特性研究[J].干旱地区农业研究,2009,27(3):119~126 |
| 重粉质黄土淤地筑坝特性研究 |
| Studies on engineering properties of soil\|retaining dam on heavy sitty loess |
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| DOI：10.7606/j.issn.1000-7601.2009.03.22 |
| 中文关键词: 重粉质黄土 淤地筑坝 土工特性 |
| 英文关键词:heavy sitty loess soil-retaining dam geotechnical properties |
| 基金项目:西北农林科技大学科研创新团队支持计划； 陕西省水土保持局淤地坝建设基金(K332020806) |
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| 中文摘要: |
| 试验以陕西省白水县西武村附近流域的黄土作为研究对象,按照土工试验规程(SL237-1999)进行分类、击实、剪切、压缩等各项试验,对试验结果进行了统计分析。分析结果表明,该流域黄土的CU>5,CC∈(1,3);小于0.005 mm的土粒、有机质和可溶性盐的百分含量分别为24.5%、2.4%和4.5%;最大干密度ρdmax和最优含水率ω0p的均值μ的95%的置信区间分别为\[1.76,1.78\]和\[15.18,16.36\];施加压力接近110 kPa时,曲线出现拐点且压缩系数av等于0.1 MPa-1是高压缩性和低压缩性的分位点;渗透系数介于8.8×10-5~3.9×10-5之间;直剪试验结果表明,该地区土料粘聚力C和内摩擦角φ分别为50.20 kPa和25.96°;而三轴剪切试验结果是:粘聚力C介于4 888 kPa,内摩擦角φ为23.54°。由此得出该地区重粉质壤土粒径分布不均匀且级配良好,是合适的工程填料;能满足水坠坝规范要求;在最优含水率前后,压实质量受含水率的影响敏感性具有同等程度;当压力大于110 kPa,压力增大而土体的体积基本保持不变;该地区重粉质壤土适用于均质坝的防渗土料,也可作为水坠坝的填料;在边坡稳定演算时内摩擦角采用23.54°。 |
| 英文摘要: |
| Loess near the Xiwu Village in Baishui County of Shaanxi Province was regarded as test object.All tests,such as classification,hit\|solid,shearing and compression,were conducted according to geotechnical test specification.Then the test results were analyzed.The results were as follows: CU>5,CC∈(1,3), the perentage content of soil particle which was smaller than 0.005 mm,organic matter and soluble contamination were 24.5%,2.4% and 4.5%,respectively.The 95% confidence interval of the average maximum dry density and the optimum moisture content were 1.76～1.78 and 15.18～16.36 respectively.When the pressure was near 110 kPa,there was a inflection point in the curve,and the compressibility which was 0.1 MPa-1 was the quantile of high\|compressibility and low\|compressibility. And the permeability coefficient lay between 8.8×10-5～3.9×10-5. The results of direct shear test showed that the cohesive force and the internal friction angle of soil material in this area were 50.20 kPa and 25.96°, respectively. What’s more,the results of tri-axial shear test showed that cohesive force lay between 48～88 kPa, and the internal friction angle was 23.54°. According to all the results, the particle size distribution of heavy silt loam was uneven and had a good gradation so that soils in this area were suitable engineering filler,and could meet the demand of sluicing-siltation dam specification. The influential sensibility of moisture on compaction quality had the equal degree pre and post of the optimum moisture content. When the pressure was greater than 110 kPa,the soil volume remained almost the same with the pressure increasing. The heavy silt loam in this area not only was suitable for impervious soil of homogeneous dam,but also could be the filler of sluicing\|siltation dam. When slope stability calculation was conducted,the internal friction angle should be 23.54°. |
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