보강토옹벽 뒷채움재료로서 쇄석혼합토의 강도특성 연구
Strength Characteristics of Soils mixed with Crushed Stone as a Backfill of Reinforced Earth Wall
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초록
보강토 옹벽에서 가장 중요한 것 중 하나는 양질의 뒷채움 재료를 구하는 것이다. 그러나 양질의 재료가 부족하여 부득히부족한 토사대신 현장 유용토인 쇄석을 혼합하여 보강토 옹벽을 축조한 사례가 있었다. 따라서, 본 연구에서는 보강토옹벽의뒷채움 재료로서 쇄석혼합토를 사용할 경우 혼합비에 따른 입도분포, 전단특성 및 인발특성에 대해서 각각 실험을 통하여혼합비에 따른 특성변화를 검토하고자 하였다. 또한, 다양한 쇄석의 함유량에 대해 입도 선정기준에 적합한지 여부를 검토하였는데, 시험결과 입도19mm이하의 쇄석을 20%까지 혼합한 경우 뒷채움재료의 입도기준을 만족하였다. 전단강도정수 및 인발정수를 구하는 시험을 실시하였는데, 정수들은 쇄석함유량이 증가함에 따라서 증가하였다. 쇄석혼합토가 뒷채움재료로 사용될경우 본 연구결과는 설계참고자료가 될 것으로 판단된다.
Abstract
The most important thing in the design of the reinforced earth retaining wall is to obtain the good backfill materials. However there was a special case using soils mixed with the crushed stone, because the field ran short of good backfill soils. Accordingly in this study various kind of tests were performed according to the mixing content of a crushed stone, which are the gradation curve, the direct shear test and the pullout test. From the test results at first the gradation of soils mixed with crushed stone has been compared with the selecting standard as backfill of reinforced earth wall. And the grdation standard has been satisfied in case of mixing ratio 20% of a crushed stone under 19mm. Also the direct shear test and the pullout test have been performed and at the test results the shear strength parameter and the pullout strength parameter were increased with the increse of the mixing content of a crushed stone. It has been thought that this study will give important data to a designer in designing the reinforced earth wall with soils mixed with crush stones.
참고문헌 (9)
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