Pengaruh Gabungan Kepadatan, Kadar Air, Ketebalan Lapisan, dan Energi Kompaksi terhadap Nilai Kuat Tekan Bebas (UCS) pada Tanah Lempung Plastisitas Tinggi
DOI:
https://doi.org/10.29103/tj.v16i1.1306Keywords:
high plasticity clay, unconfined compressive strength (UCS), compaction energy, water content, non-uniform compaction, layer thicknessAbstract
Abstrak
Tanah kohesif, khususnya lempung lunak dan lempung ekspansif, menimbulkan tantangan significan dalam proyek teknik sipil karena karakteristik geoteknik nya yang kurang baik. kegagalan pada konstruksi sipil, seperti perkerasan jalan, sering terjadi akibat daya dukung tanah yang rendah yang diakibatkan oleh lempung plastisitas tinggi. Penelitian ini bertujuan untuk mengevaluasi faktor-faktor utama yang mempengaruhi nilai Unconfined Compression Strength (UCS) dan mengamati pola keruntuhan yang sesuai terutama di bawah kondisi pemadatan yang kurang seragam. variabel utama yang di selidiki adalah kepadatan tanah (dikontrol oleh energi pemadatan), kadar air, dan ketebalan lapisan pemadatan (dikontrol oleh massa tanah per-lapisan). kadar air divariasikan menjadi tiga kondisi: di bawah kadar air optimum (OMC), pada OMC, dan di atas OMC. Variasi ketebalan lapisan dirancang untuk mensimulasikan pemadatan lapangan yang non-seragam, diatur dengan mengontrol massa tanah pada setiap dari tiga lapisan yang dipadatkan. Hasil pengujian secara konsisten menunjukan bahwa tanah yang dipadatkan pada nilai OMC menghasilkan nilai UCS tertinggi sebesar.... Lebih lanjut, variasi ketebalan lapisan menunjukan bahwa semakin kecil massa tanah per lapisan (yang menghasilkan lapisan yang lebih tipis dan lebih padat), semakin besar pula nilai UCS yang dihasilkan. Peningkatan kekuatan ini disebabkan oleh distribusi energi pemadatan yang lebih merata di seluruh lapisan. temuan paling penting dari studi ini adalah bahwa bidang keruntuhan paling kritis didominasi terlihat pada lapisan tengah sampel, terutama pada spesimen yang dipadatkan secara non-seragam. hal ini mengindikasikan bahwa antar muka antara lapisan pemadatan yang tidak seragam berpotensi menjadi zona kelemahan yang memerlukan pertimbangan cermat dalam aplikasi konstruksi di lapangan.
Kata kunci: lempung plastisitas tinggi, kuat tekan bebas (UCS), energi pemadatan, kadar air, kepadatan non-seragam, ketebalan lapisan.
Abstract
Cohesive soils, especially soft clay and expansive clay, pose significant challenges in civil engineering projects due to their poor geotechnical characteristic, such as road pavement, often occurring due to low bearing capacity caused by high plasticity clay. this research aims to evaluate the main factors that influence the Unconfined Compression Strength (UCS) and observe the corresponding failure patterns, especially under uniform compaction conditions. The main variables studied are soil density (controlled by compaction energy), water content, and compaction layer thickness (controlled by soil mass per layer). the water content was varied into three conditions: below optimum moisture content (OMC), at OMC, and above OMC. Variations in layer thickness were designed to simulate non-uniform field compaction, arranged by controlling the soil mass of each of the three compacted layers. consistent testing result show that soil compacted at the OMC value produces the highest UCS value. Furthermore, variations in layer thickness indicate that the smaller the soil mass per layer (resulting in thinner and denser layers), the greater the resulting UCS value. The increase in strength is due to a more even distribution of compaction energy throughout the layers. the most important finding of this study is that most critical failure plane is dominantly observed in the middle layer of the sample, especially in specimens compacted non-uniformly, indicating that non-uniformly compacted layers have the potential to become weak zone that require careful consideration in field construction.
Keywords: high plasticity clay, unconfined compressive strength (UCS), compaction energy, water content, non-uniform compaction, layer thickness
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