Back Analysis and Potential Remedial Approach for Failure Slope at Bukit Nanas, Kuala Lumpur

This study aims to validate the design parameters and stability of the slopes failure and propose acceptable remedial work by assessing the slope stability in Bukit Nanas, center of Kuala Lumpur. The slopes’ height is around 40 and 60 m with the gradient around 30°-45°. Totally 7 boreholes be carried out and the pertinent engineering properties were analyzed from laboratory testing and back analysis (in situ test). An established computer program SLOPE/W was used to carry out for slope stability analysis. The analysis method adopted was Morgenstern-Price’s Method. Based on the result of the field investigation and numerical analysis, the model of lowest factor of safety (FOS) that evaluated from the existing slope in critical section were selected and recommended for remedial work. Two option of remedial slope design had been proposed. The first option is soil nailing with grid beam and proposed drain while the second option is hybrid anchor with grid beam and proposed drain. Both options are used to improve the slope stability, but first option had been chosen as higher FOS and more efficient option. This remedial approach based on the main cause of slope failure in Malaysia can applied as reference in future slope remedial design

Effectiveness of coffee husk ash and coconut fiber in improving peat properties

Peat is a well-known problematic soil associated with poor engineering properties because its engineering with low shear strength, highly compressible, high moisture content. The characteristics make it unsuitable for construction in its natural stage. Thus, this study determines the soil properties of untreated peat soil and assesses the changes in strength of the treated peat soil using the admixture of Coffee Husk Ash (CHA) and Coconut Fibre (CF). The percentage of CF used is 0.50%, 0.75% and 1.0% meanwhile the percentage of CHA used was 5%, 6%, and 7% by the weight of the soil sample. The peat soil for this study were retrieved from Mardi Pontian in Johor. Soil properties such as moisture content, bulk density, and the Atterberg limit have been tested. The result of the Standard Proctor test in this study determined the Optimum Moisture Content and Maximum Dry Density of soil samples. The strength of these samples has been determined by using the Unconfined Compressive Strength (UCS). The physical properties for untreated peat soil with the moisture content of 250%, organic content about 77%, the specific gravity was in the range of 1.48–1.8. The Atterberg limit for liquid limit is 230. The compaction test results has shown decrement in maximum dry density (MDD) but an increase in strength with the addition of CHA and CF in peat soil. According to the findings, 0.5% of Coconut Fiber improves the engineering properties of peat soil (CF)

Assessment of physicochemical parameters for the drinking water quality in the vicinity of Nawabshah City, Sindh, Pakistan

Quality of water may differ according to the geography of the region, due to that the quality of water is big concern worldwide, because majority of disease caused by the poor quality of drinking water. Subsequently realizing the significance of drinking water quality with in the central part of the Sindh province, this research work was carried out to assess the drinking water quality within the Nawabshah city, where the single source of supply water is the Gajrawah after the conventional treatment through the open ponds. In this study seven physicochemical parameter were investigated and laboratorial investigations demonstrated that the pH values were found with the WHO limits, TDS & EC values were found within the acceptable limits, except in one residential area, Turbidity was also high at all the locations only one area (Marium road colony) was found within the standards, furthermore, the hardness was present in all the samples at all the locations, which indicate that the water supplied to public was hard in nature. In addition to that Temperature and Dissolved Oxygen were found safe and within the limits and it was concluded that the water supplied to residents of the inspected areas were found not fit for drinking and it is suggested that the water supply, should be improved and essential steps should be taken to treat the water

Permodelan keupayaan tenaga serapan bagi tiub pelindung laga menggunakan kaedah unsur terhingga

Kajian ini dijalankan untuk mengkaji prestasi penyerap tenaga dan kelakuan runtuhan pada pelindung laga apabila berlaku perlanggaran. Pelindung laga dapat mengurangkan tahap kecederaan kepada pemandu dan penumpang kenderaan semasa berlaku kemalangan. Berdasarkan kepada kajian lepas, kebanyakkan perbincangan dijalankan adalah dalam mampatan sepaksi. Namun, mampatan sipi kurang dibincangkan. Pada masa yang sama, kurang kajian pada tiub hibrid dalam struktur pelindung laga. Model simulasi tiub pelindung laga dibina dengan menggunakan unsur terhingga ANSYS/LS-DYNA dengan mampatan kuasi-statik. Tiub pelindung laga menggunakan keluli berketahanan tinggi sebagai lapisan dalam dan bahan komposit pada lapisan luar. Bahan komposit yang digunakan adalah e-kaca/epoksi dan karbon/epoksi. Perubahan mampatan nisbah sipi yang digunakan adalah 0.00, 0.25, 0.50 dan 0.75. Perubahan sudut susunan komposit yang terlibat adalah [+30º/-30º/+30º], [+45º/-45º/+45º] dan [+60º/-60º/+60º] dengan ketebalan lapisan 0.5, 0.8 dan 1.0 mm. Manakala, perubahan nisbah elips yang digunakan pada tiub keluli adalah 0.5, 0.7, 1.0, 1.3 dan 1.5. Selain itu, jenis sentuhan algoritma yang digunakan adalah "automatic surface to surface contact", "contact automatic single surface", "contact eroding single surface" dan "contact tiebreak surface to surface" pada jasad tegar, tiub keluli dan lapisan komposit. Kesan perubahan ketebalan, jenis dan sudut susunan lapisan komposit terhadap prestasi tenaga serapan dan kelakuan runtuhan beransur dipertimbangkan dalam kajian. Kajian ini menunjukkan tiub hibrid menghasilkan prestasi tenaga serapan yang lebih baik berbanding tiub keluli kosong. Selain itu, didapati jenis komposit karbon/epoksi menghasilkan keputusan yang lebih baik berbanding dengan komposit e-kaca/epoksi terhadap prestasi penyerapan tenaga