DWIFUNGSI RUAS JALAN PENGALIH TEBANGAN LEMBAK SEBAGAI KOLAM KONTROL DEBIT

ABSTRAK Wilayah operasional Pit B/C PT Kaltim Prima Coal (KPC) area Bengalon terus melakukan ekspansi penambangan pada tahun 2019. Operasional pit akan memotong jalan umum dalam status Jalan Kabupaten penghubung desa Tebangan Lembak, Sepaso Barat dan kota kecamatan Bengalon. Salah satu ruas pemindahan jalan juga akan menjadi area tangkapan air limbah hasil operasional dumping Nakula Pit B/C yaitu pada titik penaatan kolam Kemuning. Penggunaan salah satu ruas jalan pengalih antara STA 2+100 – 2+375 untuk sekaligus dijadikan kolam kontrol debit menjadi opsi yang menarik mengingat potensi penghematan akan didapat perusahaan. Riset ini menggunakan metode pendekatan kuantitatif dengan menghitung dan membandingkan volume pekerjaan tanah terhadap dua kondisi berbeda. Perhitungan penghematan didapatkan dengan memakai harga kontrak yang telah ditetapkan untuk pekerjaan konstruksi jalan. Biaya tambahan yang mencakup faktor non-teknis juga dimasukkan dalam perhitungan biaya karena penggunaan jalan ini perlu mendapatkan izin dari Bupati Kutai Timur. Dapat disimpulkan bahwa dengan integrasi pembangunan jalan pengalih sekaligus sebagai kolam kontrol debit air limbah tambang, KPC menghemat biaya konstruksi sebesar 41% dari total biaya konstruksi infrastruktur Pit B/C. Kata kunci: Jalan pengalih, kontrol debit, titik penaatan. ABSTRACT Operational area of Pit B/C PT Kaltim Prima Coal (KPC) continues to expand in 2019. Pit operation will cut public road with the status of connecting road between Tebangan Lembak village, West Sepaso and Bengalon sub-district. One of the re-alignment road segments will also be crossed by mining water flow from Nakula Dump activities at Pit B/C down to Kemuning Pond. Utilization those road segments between STA 2+100 to 2+375 to be control pond discharge shall be profitable for company. The research use quantitative approach by calculating and comparing earthwork volume for two different options. Saving calculation use the rate from approved contract for this road construction. Additional cost that covers non-technical issue also included in the calculation since utilization of road shall be approved by Bupati Kutai Timur. It is concluded that the integration of road and control pond discharge will save the cost for construction of Pit B/C KPC infrastructure by 41%. Keywords: Road re-alignment, discharge control, compliance point.

Study of the LiDAR accuracy in mapping forest road alignments and estimating the earthwork volume

Today, differential geographical position system and total station devices are improving the accuracy of positioning information, but in critical locations such as steep slopes and closed canopy cover, the device accuracy is limited. Moreover, field surveying in this technique is time-consuming and expensive. For this reason, remote sensing technique such as light detection and ranging (LiDAR) laser scanner should be used in field measurements. The objective of this study was to evaluate and compare precision and time expenditure of total station and airborne LiDAR in producing horizontal and vertical alignments and estimating earthwork volume of two proposed forest roads in a deciduous forest of Iran. To investigate this task, the geographical position of proposed forest roads were detected by differential geographical position system and then marked on land. Mentioned roads were taken again with Leica Total Station (LTS) on control points with same 5 m intervals from start point. Recent data served as a reference value for comparison with LiDAR measurements. The data were processed in Civil 3D, Fusion and Leica geo office software. Results showed that in comparison to field-surveyed routes by LTS, the LiDAR-derived routes exhibited a horizontal accuracy of 0.23 and 0.47 m and vertical accuracy of 0.31 and 0.66 m for road 1 and road 2, respectively. The LiDAR-derived sections every 1 m exhibited cut and fill accuracy of 2.39 and 3.18 m³ for road 1 and 2.98 and 5.60 m³ road 2, respectively. In this study, it was proved that the road project can be prepared faster by LiDAR than that of LTS. Therefore, high accuracy of road projection by LiDAR is useful for terrain analysis without the need for field reconnaissance.

Study on Factors for Determination of Highway Subgrade Height

With increasing concentration on highway land issue as the new round of highway construction, reducing land occupation and earthwork volume of highway engineering is necessary under the historical background of building “resource-saving and environment-friendly” society. It’s been widely known now in the industry that subgrade height of highway in China, especially high-grade highways, is on the high side. Therefore, it’s significantly necessary to discuss and study on appropriate subgrade height. This paper explains advantages and disadvantages of low-filled embankment and expounds current situation of indexes for subgrade performance – moisture, modulus resilience and permanent deformation; it proposes basic thinking of determining subgrade height mainly through meeting subgrade performance and engineering requirements and realization approach of the method.

Earthwork Calculation Based on GPS Discrete Elevation Points

In the terrain smaller land formation zone, GPS discrete elevation points can quickly calculate the digging and filling side volume. Use the commonly used geographic information system software, and then select the auxiliary calculation the earthwork volume method based on the use of scattered elevation data, after the trial of the final design to meet the requirements of the plots elevation, you can improve the accuracy of calculation of the amount of earth in the land formation, so as to provide accurate data for the project planning, design and project budget.

Analysis of Design Strategy of Regional Green Architecture

For developing regional green building, it is very important to absorb the traditional architectural conception of energy conservation. Based on this, this article discusses a series of regional green building design strategies focusing on four aspects. First is responding to regional material, includes making use of local materials, modern renewal of traditional material, reuse of waste materials. Second is responding to regional natural climate, includes “closed insulation + solar energy use”, "ventilation + sunshade", "active ventilation + shade + activities insulation" and active utilization strategy. Third is responding to terrain elements, includes minimum of terrain environment damage and reduction of earthwork volume. Last is responding to regional culture, including expression of traditional materials, restructuring of traditional construction, modern interpretation of traditional regional.