Experimental Study On Engineering Properties Of Bahe River Gravel Stone

Dam is an important part of the water conservancy project, the main constraint from theriver to prevent erosion and protect the safety of people on both sides of the role of water onthe river bank, so it is necessary for the next dike construction quality and safety assessmentbig effort.According to this article in the Bahe River gravel, because the distribution of a largenumber of rivers grit stone for embankment filling provides a natural material, gravel, stonehas a wide distribution, large reserves, drainage and strong, and good compaction, but its owncharacteristics and determine the ease of uniform dispersion, and large permeable filler is notconducive to the stability characteristics of the project. Its in-depth study to better applied toengineering practice, has great economic and practical significance of these features based ongravel.Based on laboratory tests, the results of basic properties of sand and gravel, determinedgrit stone compaction control targets in the project site compaction test site, a reasonablethickness and compacted gravel paved the way Ishimatsu, rolled several times for the projectprovide the basis for construction.Obtained by experiment:(1) By particle analysis test by the local gravel stone grading curve can be seen thatcurve slow, uniform particle size distribution, with a good grade.(2) The relative density test to get through the minimum, maximum dry density curvesobtained with the sand content relative density of0.6corresponds to a dry density, using theleast squares polynomial fitting for data processing, combined with practical engineering aftertreatment validate data obtained in the fitting for the times to meet the requirements of3.(3) In this paper, the field test to determine rolled several times during construction,and provide the basis for the subsequent construction, in contrast to a thickness of50cm andloose laying down gravel data at different times of the number of rolling40cm and so on, getloose in the shop degrees to40cm rolled several times to6to meet the requirements of qualityand efficiency.(4) Through a lot of test data found that after rolling dry density increases with increasing levels of coarse material (coarse material content is small) when roughage contentof dry density reaches a certain value but with increasing levels of roughage and less small,the maximum dry density of coarse material content is optimal when coarse content, optimallevels of different types of coarse gravel mostly around70%.(5) The degree of sample water content has a great effect on rolling, rolling with themoisture level of the quality of a certain relationship, that is absolutely free to do workoutside the underwater just to overcome friction between the particles, the particles inbetween water containing a small amount of power consumption in the external part of theadhesive force between the water molecules, the water content in the optimum lubricatingeffect of moisture on the particles, but will exceed the absorption of the aqueous part of theexternal function, the water content mainly with fine feed, but it works fine material contentwithin a certain range, which is more sensitive to the water content in this article to get thelarge amount of sand has little effect on the rolling of.