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 Wysłany: Śro 10:13, 06 Kwi 2011 Temat postu: The amount of expansive soil swelling of soaked CB |
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The amount of expansive soil swelling of soaking CBR
Cause large changes in the volume of the viscosity (<0.002mm) part. Important mineral composition of viscous kaolin, illite and montmorillonite soil. MMT has the unusual physical characteristics, it is a great surface area, about up to 800r ~ / mg, liquid limit is high, and the expansion of crystal frame structure with a high ion exchange capacity, water swelling of montmorillonite. MMT content of expansive soil and the soil in much the number of exchangeable ions determines the size of Earth's expansion. 2, China's expansive soil classification of different countries and different scholars have proposed the division of expansive soil severity by the use of indicators and benchmarks with, our literature 『1 (soil test) divided as follows: Weak Inflation 40% ≤ Fs <65% towel expansion ± 65 <Fs <90% highly expansive soil Fs ≥ 9O% Second, volume expansion test: 1, compaction test: (1) preparation: Test soil material with gray, dark gray, brown three expansive soil, the soil index CBR test results shown in Table 1 and Table 2 decline 1, expansive soil filler liquid limit of soil geotechnical data refers to the maximum dry density of the best dressed leather gray water Rotary expanded seven 57.83l_01.7420.1 black expansive soil 52.829.11. 6122. Bad 2 O tan 67.032.516220.3, expansive soil testing soil samples CBR filler (98 hit) CBR flooding dark gray expansion rate of inflation persons 2. Ol6.3 gray-black expansive soil 2.11O. 2 tan 3.17.82, CBR test (1) compaction test obtained by the maximum dry density and optimum moisture content boring material. (2) to prepare three kinds of dry density, dry density of each sample system 3. A total system of nine samples, each hit, respectively 3O, 5O, and 98 times, so that the dry density of specimens from less than 95% to 100% of the maximum dry density. (3) a real relationship between the degree and the CBR, /,, IJ / 3, flood damage measured expansion of the amount of steps: (1) the specimen is made, remove the top surface of the broken specimen residual filter paper, put a sheets filter paper, and the lever is installed with multi-L plate board, in porous plate E plus four loading plate (simulating the forces subgrade). (2) simple test with the release of porous plate slot (to not turn on the water), and the mold with a tension rod, install sub-table. And read the first reading. (3) to turn on the water tank so the water freely into the top and bottom of the specimen during the flood damage, water in the tank should be maintained above the top surface of the specimen of about 25ml. (4), 2-3 hours for the expansive soil should be read, and zero (percentage of mourning). (5) calculation of the amount of swelling. 4, the amount of expansive soil CBR expansion and free expansion test as shown in Table 3 Comparison of decay 3, the amount of expansive soil swelling soil the name of free expansion test test test 98 times the amount of gray soil CBR expansion of gray and black soil 38l0.2 Huang 6416.3 brown soil 42785, CBR immersion specimen changes with time expansion of relations: the white CBR expansive soil specimens after immersion in the upper body with the expansion of the relationship between flooding, see below question, which show the amount of expansive soil on the 2 immersion expansion hours to reach 3%. 9 hours to about 8% and growing at any time to ask, soaked 4 days after the flooding of inflation reached 16.3% in Kansas and is still growing. - ÷ /, ● /. i A 77 Third, the expansion of the amount of test analysis: I, under the expansive soil in the CBR test the water immersion test towel to simulate the case of subgrade soil strength, there are still 16.3%, lO. 2%, 7.8% expansion of Velvet, the flooding situation, there is damage to the subgrade, rather than expansive soil compaction in 98 cases. Most CBR expansion amount of flooding of 1 to 3%, a large volume expansion of 3 to 5%. 2, a free expansion test enough volume expansion in the free state the amount and the actual situation of the road vary greatly, according to gray-black soil testing, free expansion shoes, towels not meet specification requirements expansive soil, but reached 10.2 soaking CBR expansion % is clearly expansive soil, can not be used for road construction fill, it is recommended specifications should be used instead of silver carp to control the expansion of flooding CBR subgrade is more realistic. 3, according to the test data, the CBR soaking expansion Zha (98 times) less than 3% can be used, consider the use of within 3-5%, while inflation is greater than the amount of 5% CBR flooding embankment is not used directly, should take special technical measures can be used, including lime, cement. Gall
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