A Water Preservation Base under Porous Pavement of Traffic Road
碩士 === 國立臺灣科技大學 === 營建工程系 === 105 === To build a sponge city which can absorb and keep the rain water under the pavements of roads, pedestrian walks, parking lots has been recently gaining more and more attention to the public and the government as well. Although this is a good idea for the sustaina...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2017
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| Online Access: | http://ndltd.ncl.edu.tw/handle/bs86rr |
| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 105 === To build a sponge city which can absorb and keep the rain water under the pavements of roads, pedestrian walks, parking lots has been recently gaining more and more attention to the public and the government as well. Although this is a good idea for the sustainability of the environment, it may be a bad idea for the road maintenance department. Because the water preserved in the water storage space under the porous pavement may soften the base soil and weaken the bearing capacity of subgrade. This study proposes a modified road base design for the porous pavement. It uses a water barrier under the water storage gravel layer. This design also integrates the porous pavement with the perforated side ditches. It can not only keep the water storage capacity beneath the porous pavement but also maintain the infiltration ability of water to moisture the base soil without jeopardizing the bearing capacity of the road. Laboratory tests were adopted to study the changes on moisture content and strength properties of the base soil. The test results showed that the water barrier formed by a layer of colloidal silica sand could stop the water infiltration to the base soil and prevent any softening effect of soil due to soaking; a clayey gravel layer is also used to protect the integrity of the underlying colloidal silica sand layer. This road base system can be used with the porous pavement to preserve water under the pavement and to adjust the micro-climate around it.
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