| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 102 === Recently, Taiwan's economy gradually has developed, in opposite to the demand of infrastructure greatly enhance. In the infrastructure, Temporary road becomes indispensable role, because let large equipment of engineering to easily access the site. However, temporary road must be laid on the soft and compressible of soil subgrade. Because Taiwan is a subtropica and warm and rainy climate, throughout the island will have heavy rain, it may make the original soft soil with the low bearing capacity to reach saturation, the bearing capacity further reduce. During construction or after, the roads easily produce bearing-capacity failure, and there is a large settlement, derivative to safety
accident causes the loss of lives and property and the increment of social costs.
In order to strengthen the bearing capacity of weak soil, geosynthetics can be used (such as geogrids or geotextiles ) and by goesynthetics used in the mechanical mechanism of stiffened road to improve the insufficient bearing capacity characteristics of soft soil. In this study uses the California Bearing Ratio test, simulate the subgrade condition of reality tmporary road, use Central University laterite soil as a subgrade soil. And then use the different moisture content as the test factor is observed, to investigate the changes of bearing capacity in the unpavement.
The following summaries from preliminary test result are
addressed:(1) In the unsoaked condition, compaction moisture content increases, the CBR value of the specimen reduces. Conversely, compaction II moisture content increases, the CBR value of the specimen rises, indicate the amount of compaction moisture content will affect the bearing ratio,
and the swelling amount of specimen after immersion in water are closely related to the bearing ratio; (2) In soak and different laying position condition, stiffening effects of geotextiles in the dry side, the O.M.C side and the wet side of the modified compaction curve have different trends.
In conclusion, the stiffening effects on the wet side of the optimum moisture content are greater than on the dry side of the optimum moisture content. And the stiffening effects on the dry side of the optimum moisture content are greater than on the optimum moisture content side.
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