Comparative subsurface characterization of the quaternary and residual sites in northern Peninsular Malaysia by cumulative SPT(N) for assesing concrete pile foundat
Kawasan Utara Semenanjung Malaysia kebanyakannya terdiri daripada tanah liat lembut untuk kawasan pantai. Tanah liat lembut meyebabkan cabaran kepada aktiviti- aktiviti pembinaan. Sementara itu, kawasan utara juga terdiri daripada tanah laterit tetapi kurang membangun berbanding kawasan pantai. Dalam kajian ini, suatu kaedah baru bagi menilai kualiti tanah telah diperkenalkan. Secara khususnya, data ujian penembusan (SPT) telah ditukar kepada nilai SPT(N) terkumpul untuk tujuan pembandingan antara tapak. Nilai SPT(N) daripada ujian penembusan yang terdiri daripada tiga tapak tanah liat marin dan tiga tapak laterit telah digunakan dan ditukar kepada nilai SPT(N) terkumpul. Bacaan bagi nilai SPT(N) terpilih adalah daripada kedalaman 1.0m. Kawasan- kawasan dari tanah liat marin akan dibandingkan dengan kawasan- kawasan dari tanah laterit. Dalam kajian ini, setiap tapak dari tanah liat marin akan dibandingkan satu sama lain mengikut kedalaman sebenar daripada data dan jugak kedalaman yang sama untuk kedua- dua tapak (5m). Penilaian berdasarkan kepada julat nilai SPT(N) terkumpul dan bentuk garisan lekungannya dimana tanah liat marin mempunyai lebih kecuraman berbanding tanah laterit. Nilai SPT(N) terkumpul untuk tanah laterit adalah tinggi berbanding tapak tanah liat marin. Oleh itu, penilaian sesuatu tapak berdasarkan nilai SPT(N) terkumpul didapati lebih praktikal untuk digunakan dalam amalan geoteknikal. Kaedah SPT(N) terkumpul juga dijangka mampu membezakan kualiti sesuatu tapak dari segi keperluan asas. Dalam kajian ini, penilaian keupayaan galas cerucuk sesuatu tapak akan melibatkan SPT(N) terkumpul dan juga SPT(N) terkumpul kedua. Suatu korelasi kedalaman dan jumlah keupayaan galas dihasilkan. Panjang penembusan tanah digunakan adalah 5m dan 10m kedalaman dan tanah liat marin dipilih. Korelasi kedalaman dan jumlah keupayaan galas sangat berguna untuk menganggarkan kesesuaian panjang cerucuk yangakan digunakan dalam rekabentuk asas
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The Northern Peninsular Malaysia area mostly consists of soft marine clays for coastal area. This marine clays are makes it challenging to construction activities. Meanwhile, northern area also consists of laterites soil but less develop compared to coastal sites. In this research, a new method of evaluating the quality of soils was introduced. Specifically, the standard penetration test (SPT) data were converted into the cumulative SPT(N) value curve for comparison between sites which is marine clays and laterites soil. SPT(N) value data obtained from Piezocone test from three marine clays sites and three from laterite sites were used and converted into cumulative SPT(N) value curves. The selected SPT(N) value reading were from the 1m intervals. The sites from marine clays will comparing to the sites from laterite soil. In this study, each marine clay site and laterites will be comparing each other with their actual depth from the data and also same depth for both sites (5m). The evaluation based on the range of cumulative SPT(N) values and shape of the curve which marine clays have steeper line graph compare to laterites. The cumulative SPT(N) value for laterites were higher than for marine clays sites. Thus, the evaluation of a site based on cumulative SPT(N) values was found more practical to be used in geotechnical practice. The cumulative SPT(N) method also expected to be able differentiate quality of sites in terms of foundation required. In this study, the evaluation of pile bearing capacity of a site will be involving the cumulative SPT(N) and also second cumulative SPT(N). A correlation of depth and total bearing capacity are produced. The length of soil penetration used are 5m and 10m under the ground and marine clays sites were chosen. The correlation of depth and total bearing capacity very useful to estimate suitable length of pile to be used in foundation design.
Comparative subsurface characterization of the quaternary and residual sites in northern Peninsular Malaysia by cumulative SPT(N) for assesing concrete pile foundat
Comparative subsurface characterization of the quaternary and residual sites in northern Peninsular Malaysia by cumulative SPT(N) for assesing concrete pile foundat / Nur Farah Shahirah Besenun