Replacement of Weathered Clay Shale Using Soil Cement for Bridge Approach Embankment in Purwakarta - Indonesia

Albert Johan, Andy Sugianto, Paulus Pramono Rahardjo
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Abstract

Clay shale is a sensitive soil material that easily experiences weathering if exposed to open air, sunlight, water. Weathered clay shale is commonly located near the surface and has a soft consistency due to surface water infiltration. Referring to this condition, weathered clay shale is prone to experience soil movement if backfill work is conducted on the top side of weathered clay shale material. Therefore, to minimize the potential of soil movement during backfilling, soil replacement using soil cement is recommended to be conducted to gain higher soil shear strength and to prevent excessive water infiltration to the fresh clay shale. To gain further understanding, a comprehensive study about the replacement of weathered clay shale using soil cement for bridge approach embankment in Purwakarta was carried out. This study comprises site observation, field data collection, laboratory test, explanation about implementation and quality control. The stages in implementation of soil cement is carried out in several stages such as : evaluation of soil condition on the project site, checking the suitability of local soil for the soil cement stabilization, conducting field test trial mockup followed by quality control, conducting crumb test and mechanical properties test for soil cement mixture. Based on assessment results, the soil cement mixture shall be directly compacted after the soil cement mixture is homogeneous to prevent segregation and shall be given a curing time of at least 3-7 days without additional water to gain better soil shear strength. Furthermore, according to the crumb test result, soil cement material was identified as quite impermeable which is verified by evidence that there was no significant change in water content and the soil cement sample could still stand firm after soaked for 7 days.
在印度尼西亚普瓦卡塔引桥堤坝中使用土质水泥替代风化粘土页岩
粘土页岩是一种敏感的土壤材料,如果暴露在露天、阳光和水中,很容易发生风化。风化粘土页岩通常位于地表附近,由于地表水的渗透,其稠度较软。在这种情况下,如果在风化粘土页岩材料的顶面进行回填工程,风化粘土页岩很容易发生土壤移动。因此,为尽量减少回填时土壤移动的可能性,建议使用土壤水泥进行土壤置换,以获得更高的土壤抗剪强度,并防止过多的水渗入新鲜的粘土页岩。为了进一步了解情况,我们对普瓦卡塔市桥梁引桥路堤使用水泥土置换风化粘土页岩的情况进行了全面研究。这项研究包括现场观察、实地数据收集、实验室测试、实施说明和质量控制。土壤水泥的实施分为几个阶段,例如:评估项目现场的土壤条件,检查当地土壤是否适合使用土壤水泥进行加固,进行现场模拟试验,然后进行质量控制,对土壤水泥混合物进行碎屑试验和机械性能试验。根据评估结果,土壤水泥混合物应在均匀后直接压实,以防止离析,并应给予至少 3-7 天的固化时间,无需额外加水,以获得更好的土壤抗剪强度。此外,根据碎屑试验结果,水泥土材料的抗渗性相当好,这一点可以从含水量没有明显变化以及水泥土样本在浸泡 7 天后仍能坚固的证据中得到验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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