| Studies on engineering properties of soil\|retaining dam on heavy sitty loess |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2009.03.22 |
| Key Words: heavy sitty loess soil-retaining dam geotechnical properties |
|
| Hits: 108 |
| Download times: 93 |
| Abstract: |
| 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°. |
|
|
|