碩士 / 中原大學 / 土木工程研究所 / 98 / The frequent disasters happened in Taiwan because of the concentrated rainfall caused by the geographical environment. In order to prevent the disasters, most rivers were built the embankments. To make sure the local sustainable development, the ecological engineering became the mainstream. Wicker works and Fascine Mattress of the embankment working method in Bei-Nan River and Fa-Tzu River responded fine effect in actual application. However, Inverse-Scale Structure dry masonry was different with Positive-Scale Structure dry masonry or Vertical-Scale Structure dry masonry in urual filled. Actual cases were obtained the result, such as 1. To decrease the flow velocity in shore and to reduce the shear stress on the embankment. 2. To fill sand in the gaps in order to increase the stability, but it was not verified in the theoretical verification. This study performed the test method to verify and analyses.
This study used the Inverse-Scale Structure, Positive-Scale Structure, and Vertical-Scale Structure dry masonry in the same experimental conditions (slop, flow rate, sand volume and time…etc) to execute the hydraulic model test and Sand Filled test, the model scale was 1:12. The hydraulic result shows that the Manning coefficient range of prototype was 0.0365~0.0597 (Inverse-Scale Structure), 0.0258~0.0469 (Positive-Scale Structure) and 0.0349~0.0416 (Vertical-Scale Structure) in the five slopes and three dry masonries. The relation was Inverse-Scale Structure> Vertical-Scale Structure> Positive-Scale Structure.When the friction coefficient was bigger, it can reduce the erosion in the shore. The result of Sand Filled test shows that the Inverse-Scale Structure dry masonry, Vertical-Scale Structure dry masonry and Positive-Scale Structure dry masonry each slope were 0.002, 0.006, 0.01, and the each ratio of sand filled quantity was 1：0.83：0.7, 1：0.80：0.69 and 1：0.84：0.77 The quantity of sand filled in the gaps was Inverse-Scale Structure> Vertical-Scale Structure> Positive-Scale Structure. The more quantity sand filled, the more denseness masonry had. It can suppose that the stability was steadier.
| Identifer | oai:union.ndltd.org:TW/098CYCU5015035 |
| Date | January 2010 |
| Creators | Yong-Ching Chang, 張嫆青 |
| Contributors | Te-Hsing Chang, Shinne Chen, 張德鑫, 陳獻 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 98 |
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