以CBR試驗探討3D列印地工格網於軟弱土壤之加勁效果

EXPLORING THE MECHANICAL BENEFITS OF 3D PRINTING GEOGRID-REINFORCED SOFT SUBGRADE THROUGH CBR TESTS

簡志峻(Chih-Chun Chien) ； 黃文昭(Wen-Chao Huang)

《中國土木水利工程學刊》 33卷6期 (2021/10) Pp. 439-450

https://doi.org/10.6652/JoCICHE.202110_33(6).0004

摘要

地工格網應用於無鋪面道路之加勁效果，已有許多學者利用物理試驗及現地實驗等不同方式進行加州貫入比（CBR）之評估，但其的產製方式與幾何性質對於加勁效果的相關研究，仍屬少數。本研究以CBR試驗進行分析，並以高嶺土作為軟弱路基黏土層的材料，基底層材料為單一尺寸的人造三角柱研磨石，由不同變數包含基底層厚度、地工格網開口幾何形狀、產製方式（市售PET材料與3D列印材料）等條件下探討加勁機制與效益。研究結果顯示，地工格網於軟弱黏土之加勁效果顯而易見，並以三角形孔徑地工格網加勁效果較佳。此外，CBR試驗結果亦顯示，運用3D列印之地工格網具有與市售加勁格網之類似效果，因此可在後續研究中客製化不同類型地工格網，進一步分析具有最佳加勁效果之地工格網型式。

關鍵字

加州貫入比試驗 ； 軟弱土壤 ； 地工格網加勁 ； 3D列印 ； 三角形地工格網

並列摘要

In this study, a geogrid-reinforced soft subgrade system's benefits are studied through a series of CBR tests. In this study, kaolinite was prepared as the weak subgrade clayey material. One-size artificial triangular prism grinding stone was employed as the aggregate base layer material. The reinforcing benefits were discussed with different scenarios, including the aggregate base layer thickness, the geogrid aperture shape, and the production method (commercial product made of PET and 3D-printed materials). The analysis results showed that the geogrid reinforcement could enhance the soft subgrade's mechanical performances, especially for triangular aperture geogrid. Finally, the research results also show that 3D-printed geogrid also exhibits a similar enhancing effect as the PET geogrid; therefore, different geometric types of geogrids may be customized in subsequent studies to explore the reinforcement effect with various test configurations.

並列關鍵字

California Bearing Ratio (CBR) test ； soft subgrade ； geogrid reinforcement ； 3D-printing ； triangular geogrid