蜂巢格網路基加勁動彈行為試驗系統建立與研究

Establishing the Resilient testing system for Study of Geocell Reinforced Sand Soil

白書維(Shu-Wei Pai)

指導教授 ： 張達德

中原大學/工學院/土木工程學系/碩士(2006年)

https://doi.org/10.6840/cycu200600472

摘要

地工合成材料應用於路基加勁及填方加勁已有很多年，在路面應用上，路面厚度設計的發展過程是由R值、CBR值等靜態貫入試驗方式，故於加勁材料試驗大多採靜態方式進行試驗。隨著交通量的成長，靜態貫入試驗已無法足以模擬現地狀況，應以動態載重試驗取代靜態貫入試驗的方式來進行試驗，以滿足道路環境及載重型態。
本研究利用反覆載重的方式進行試驗，使用LabView程式語言重新撰寫動彈行為試驗系統介面；精確控制試驗所需之加壓時間及頻率並以美觀的視窗畫面即時實驗圖形，掌握試驗狀況，增加系統控制程式的完整性。
本研究自行規劃之動態平鈑載重試驗設備，其試驗槽尺寸為(H)45.7cm×(W)45.7cm×(L)70cm分別進行兩種不同平板尺寸及不同形式蜂巢格網進行動彈行為試驗，由累積沉陷量及有效加勁比可得知，10cm蜂巢格網加勁於砂土路基之動彈試驗，有效加勁比較大。將打擊次數分成100~500進行討論發現其加勁材15cm之動態地盤反力係數呈現較大的數值，由結果可知蜂巢格網加勁於軟弱路基砂土可有效提高承載能力。

關鍵字

蜂巢格網 ； R值 ； CBR值 ； 路基加勁

並列摘要

Geosynthetics have been in use for many years as subgrade and reinforced fill. Previously, the R and CBR static penetration test values were applied to the developmental process of designing pavement thickness. For this reason, static penetration style tests were adopted to many researches of reinforcement materials. However, due to the increasing traffic quantity, static penetration style tests are unable to simulate in situ state appropriately. Thus, dynamic carrying capacity replaced static penetration testing because it satisfied the environment and loading type of the road.

This research used repeated loading to conduct the test. The interface of the resilient testing system, written in LabVIEW (Laboratory Virtual Instrument Engineering Workbench), precisely controlled the stressing duration and the frequency of the test and applied the immediate artistic window graph of the test to handle the situation to raise the completeness of system control program.

This study applied a custom-made, dynamic load plate testing device, which was 45.7 centimeters high, 45.7 centimeters wide, and 70 centimeters long. The study used sandy soils to fit two types of geocells with different heights and two types of circle plate with different diameters, one was 5.08 centimeters and the other was 10.16 centimeters. According to the settlement and fabric reinforced ratio, a 10-centimeter thick geocell had better fabric reinforced ratio. Will attack the number of times and divide into 100~500 and have better dynamic subgrade reaction coefficients.The result indicated that geocell reinforcement on sand subgrade could improve the loading capacity effectively.

並列關鍵字

Geocell ； Base reinforcement ； CBR value ； R value

參考文獻

【12】張家豪，”地工蜂巢格網加勁於砂土路基之承載能力研究”，2004。

【10】Mandal, J.N. and Sah, H.S., “Bearing Capacity Tests on Geogrid-Reinforced Clay”, Geotextiles and Geomemberanes., November, 1992.

【11】Mhaiskar, S.Y. (I.I.T); Mandal, J.N. “Soft clay subgrade stabilisation using geocells”, Geotechnical Special Publication, v 2, n 30, 1992, p 1092-1103.

【13】Raymond, G., P., ”Reinforced Sand Behavior Overlying Compressible Subgrade”, Journal of Geotechnical Engineering, Vol. 118, No.11 ,November 1992.

【16】Braja M. Das, “Principles of Foundation Engineering”, 3th Editon, California State University, Sacramento, 1996.