Site survey for installation of rockfall barrier and rock net in Siddhababa area, Palpa district, report submitted to Trumer Schutzbauten Austria
Detailed geological investigation of Siddhababa area of Siddhartha Highway was conducted by Dr. Ranjan Kumar Dahal and Dr. Manita Timilsina along with Trumer engineer Dipl-Ing. Markus Haidn along Ch 28+200 to Ch 31+500 identifying the 10 most critical sections for Rockall and debris flow.
Detailed intervention measures proposing implementation of Trumer rockfall protection fences, debris flow barriers and slope stabilization meshes are presented in a final design report to Department of Roads, Government of Nepal.
GSI in collaborative support from Trumer is installing a model site at one of the problematic stretches of Siddhababa area free of cost for Department of Roads, Government of Nepal.
Preliminary Damage Assessment of 9 residential buildings of Shah Family in Godavari, Jawalakhel, and Bhaisepati, Lalitpur
Preliminary damage assessment was carried out in the aftermath of Gorkha earthquake at various locations around Lalitpur following a checklist prepared by GSI combining the most relevant features of ATC 20, FEMA guidelines and Government of Nepal Checklist.
Due consideration was given to geotechnical site conditions along with structural and non-structural damages during preliminary damage assessment.
Detailed Damage Assessment of Reinforced Concrete Office Building at Jawalakhel, Lalitpur
Detailed damage assessment of RC office building complying with the performance-based evaluation criteria of FEMA 356 and ATC 40 was carried out after completion of the preliminary assessment. The beam-column capacity ratio was evaluated as a benchmark along with permanent drift ratio to evaluate the structure. The numerical model was calibrated with microtremor measurements for frequency content parameter of the building in its first mode and the strength of concrete and design reinforcements were checked with non-destructive testing methods (NDTs).
Detailed damage assessment showed that the building complied with Life Safety requirement passing the adequacy check for strong column-weak beam criterion
Detailed Geotechnical and structural evaluation of Shah Residency, Godavari, Lalitpur
Geotechnical drilling at 5 locations was conducted in the Godavari in order to assess the geotechnical properties of soil and check for any geotechnical issues in the aftermath of Gorkha Earthquake and subsequent aftershocks. Liquefaction potential was checked along with soil natural period characteristics using microtremor measurements.
The inadequately compacted filling material in the ground floor resulted in cracked flooring. The solution in terms of soil grouting was suggested to achieve two results: enhance compaction and bearing strength of soil and reduce the potential of liquefaction in case of strong ground shaking.
After geotechnical evaluation, a detailed structural assessment was carried out with material properties evaluated using non-destructive testing (NDT). A numerical model was developed for the building and performance-based evaluation was carried out complying with the demands of FEMA 356 and ATC40.
With an excessive torsional behavior of the building in its fundamental mode as well as storey mechanism observed in 2000-year return period earthquake (PGA= 0.54g), it was recommended to make some structural interventions. However, at the determined performance point, the structure had a performance level of Life Safety in 2000-year return period earthquake and Immediate Occupancy in 1000-year and 500-year return periods respectively.
Detailed structural assessment, retrofit design and construction supervision of Masonry School Building in Jawalakhel, Lalitpur
The building in question is of near heritage status (84 years old mud mortar masonry in neoclassical architectural design). The building suffered some damages in Gorkha earthquake especially with separation of corners and textbook flexural and shear cracks. An extensive material testing work was done with tests of 50 cubes of 50mm for brick and mortar samples from the site.
The building was modeled using state-of-art Frame by Macro Elements (FME) method in 3MURI® software tailor made for 3D modeling of masonry buildings. The analysis and design of retrofit solution were carried out complying with EN 1998:2004 response spectrum. Nonlinear Pushover Analysis was conducted using N2-Pushover procedure built into the software. Material properties were input from the test results.
The retrofit solution was designed and its numerical verification was carried out for the earthquake of 1000-year return period (PGA = 0.45g) for life safety consideration. The designed solution was implemented on site with constant supervision during construction.
Geological Field Survey in Kathmandu and Sindhupalchowk area with Research team of Kagawa University, Japan
The geological field survey in the aftermath of Gorkha earthquake was carried out by a team of international research students led by Dr. Ranjan Kumar Dahal in the most affected areas of Kathmandu and Sindhupalchowk.
A series of micro-tremor measurements were recorded at various locations in Kathmandu valley and in Sindhupalchowk. Rapid damage assessments were conducted in cultural heritage locations and highly damaged localities of the targeted districts.
The fact findings of these surveys and other subsequent studies were published as part of international conference proceeding by Dr. Ranjan Kumar Dahal.
PTSD Survey of more than 200 affected people (random sampling) living in damaged locations of Kathmandu valley was carried out in conjunction with research student of Ehime University, 6months after the earthquake as part of a socio-technical survey.
Rockfall protection system at Upper Bhotekoshi Hydroelectric Project (45MW):
GSI provided site services for installation of rockfall protection system supplied by Trumer Schutzbauten, Austria for Upper Bhotekoshi Hydroelectric Project (45MW) at its powerhouse location, Jhirpu, Sindhupalchowk, Nepal.
GSI introduced portable DTH drilling on a mountainous terrain for the first time in Nepal for anchor drilling at inaccessible locations.
GSI pioneered the commercial use of flexible protection structures for geohazards mitigation in the Himalayas.
Inaccessible drilling location and rugged terrain feature present unique challenges in carrying out drilling works; especially while drilling in the debris and stabilizing the holes in steep slopes.
Model site installation of rockfall protection system supplied by Trumer Schutzbauten, Austria in Siddhababa rock fall area of H10 Siddhartha Highway (Ch 29+500 to Ch. 31+500) for Department of Roads, Government of Nepal:
GSI submitted a detailed project report to DoR, Palpa with solutions to 10 most problematic stretches of Siddhartha Highway and has been requested to install a model site.
GSI in association with Trumer Schutzbauten, Austria provided the rockfall protection structures free of cost to Department of Roads, Nepal Government for installing a model site at Siddhababa Rockfall area.
GSI conducted the entire construction operation of this project: Drilling, Anchor grouting, Fence Installation and Slope Stabilization.
Design and construction supervision services for Earthquake Resistant School Building in Sankhu
GSI provided technical services to Himalaya Conservation Group (HCG) in the construction of new earthquake-resistant school building at Shree Rastriya Higher Secondary School, Indrayani, Kathmandu.
GSI provided soil test services with portable DCPT for evaluating the bearing capacity of foundation soil.
GSI provided a packaged civil engineering solution with a design of the building, preparation of bill of quantities, tender documents and construction supervision to HCG.
The school building is two storey state-of-art earthquake-resistant reinforced concrete building with three classrooms on each floor. The school building is designed with compliance to the performance level of LIFE SAFETY in maximum credible earthquake events (2000 year return period) and IMMEDIATE OCCUPANCY in design basis earthquake (500 year return period).
Capacity Building activities on early warning system and landslide risk assessment and mitigation measures in Achhaam District
In Achham, landslide risk was identified as a primary risk to children and communities. The project is concerned with disaster risk management, specially landslide risk assessment, early warning system, prevention model and mitigation measures using GIS and remote sensing.
Microtremor analysis and seismic microzonation for earthquake research of Pokhara Valley
This project is an earthquake research to prepare a detailed seismic microzonation map of Pokhara Valley using microtremor analysis to evaluate the risk during an earthquake and to compare the fundamental frequencies of structures with respect to the fundamental frequency of the ground. This comparison helps us to identify the resonance frequency of structure during an earthquake and suggest the structural design accordingly.
Preliminary Geotechnical Investigation of Sloped Land at Bhaisepati
Identifying the geological and geotechnical characteristics of the slope land for prescribing the proper design of foundation and superstructure by geotechnical field test (DCPT) and laboratory tests of undisturbed soil samples (consolidation, direct shear test, Atterberg tests, Hydrometer, Pycnometer, etc.)
Detail Geotechnical Investigation and Drilling works at Baral petrol pump, Pokhara
Identifying the geological and geotechnical characteristics of the slope land for prescribing the proper design of foundation and superstructure by geotechnical core drilling of 3 holes up to 15 m depth and laboratory tests of undisturbed soil samples (direct shear test, Atterberg tests, Hydrometer, Pycnometer, etc.)
Detail Geotechnical Investigation and drilling works of Satya Sai Sadan: Prayer Hall, Tokha
Identifying the geological and geotechnical characteristics of the slope land for prescribing the proper design of foundation and superstructure by geotechnical core drilling of 5 holes up to 10 m depth and laboratory tests of undisturbed soil samples (direct shear test, Atterberg tests, Hydrometer, Pycnometer, etc.)
Consulting service and construction of a pre-fabricated extension of the residential building in Sinamangal, Kathmandu
GSI provides the technical support for the project including designs, drawings, structural evaluation, bill of quantities and estimation of costs. The project also includes the supervision of the construction activities of the pre-fabricated section of the building through the entire project period.
Detail Geotechnical Investigation and Drilling works for the commercial building at Bhaisepati and Chamati, Kathmandu
Identifying the geological and geotechnical characteristics of the slope land for prescribing the proper design of foundation and superstructure by geotechnical core drilling of 3 holes; 1 hole of 20m and 2 holes of 15m up depth, 4 DCPTs, and laboratory tests of undisturbed soil samples (Tests-Index properties direct shear, consolidation specific gravity, grain size distribution etc.)
Consulting Service for Preliminary Geotechnical and Structural Damage Assessment of Residential Building of Grand Hotel Pvt. Ltd., Naxal, Kathmandu
Identifying the geotechnical and structural damage on the building located at Bhagwati Bahal, Naxal, Kathmandu due to the collapse of road section between Naxal Bhagwati and Nepal Police HQ due to the failure of protection piles in deep excavation and successive ground failures.
Geophysical training to Engineers at Birauta and Dharapani, Pokhara
Provided ERT and Seismic refraction training to the engineers at Birauta and Dharapani area of Pokhara
Detail Geotechnical Investigation and Drilling works, Geophysical Investigation, Slope Stability Analysis, UAV Drone Imaging for a commercial building at Lovelyhill, Pokhara
Identifying the geological and geotechnical characteristics of the slope land for prescribing the proper design of foundation and superstructure by geotechnical core drilling of 6 holes up to 6 m depth and laboratory tests of undisturbed soil samples (Tests-Index properties direct shear, consolidation specific gravity, grain size distribution etc.) and Slope Stability analysis.
Detail Geotechnical Assessment and slope stability structure design of Transmission Tower No. 4 Site of Hindi, Sindhupalchowk, Nepal
Upper Bhotekoshi Hydroelectric Project (UBKHEP) faced a flash flood on July 05, 2016 monsoon and as a result, both headworks and powerhouse sites were heavily damaged. Damage due to this flood extended downstream of a powerhouse and also affected the Transmission tower. The flash flood damaged the slope where transmission line tower 4 is located at Hindi village. The general scope of this geotechnical assessment is to investigate slope stability, underlying geology, impact due to the river, future potential Geohazard issues and provide the design of mitigation measures to be taken to maintain the slope stability and protect the tower.
Design, fabrication and Installation of Mechanized Ropeway at Upper Bhote Koshi Hydroelectric Project
Installation of modular mechanized ropeway system at Trumer Rockfall Protection System installation site at UBKHEP for transport of installation materials and equipment to the installation site at an elevation of about 300m from the storage site.
Geotechnical Core Drilling work at Bardibas, Mahottari
Planning and execution of core drilling work at Ratu Khola, Bardibas up-to 100 m depth and undisturbed core sample extraction for the purpose of earthquake research being carried out by Nanyang Technological University (NTU), Earth Observatory of Singapore (EOS)
Core Drilling and Detail Material Investigation of Railway Bridge Site, Upstream of Koshi Barrage
Identifying the geological and geotechnical characteristics at the Koshi channel for prescribing the proper design of foundation and superstructure by geotechnical core drilling of 9 holes up to 60 m depth, field test (SPT) and laboratory tests of undisturbed soil samples (Direct shear test, Atterberg tests, Hydrometer, Pycnometer, etc.)
Construction Services, Design and Construction of Shelter-Community Center at Kalleri, Dhading
GSI provides the technical support for the project including designs, geotechnical investigation, drawings, structural report and approval of design and drawings from concerned authorities, bill of quantities and estimation of costs. The project also includes the supervision of the construction activities of the building through the entire project period.
Technical Support to Melamchi Municipality to develop riverine setback regulations to update current building bye-laws Melamchi Municipality, Sindhupalchowk
GSI performed the technical assessment of major rivers in Melamchi Municipality to prepare a GIS-based hydro-metrological hazard and risk maps along different rivers within the jurisdiction of the municipality to suggest proper setbacks along the stretch of the rivers in order to support Municipality to develop riverine setback regulations to update current building bye-laws.
Consulting services for Geophysical Investigation using Seismic Refraction Tomography (SRT) Survey and Multi-channel Analysis of Surface Waves (MASW) at Aayu Malun Khola Hydropower Project, Okhaldhunga, Nepal
GSI performed the detailed geophysical investigation of Aayu Malun HEP at intake, desander, forebay, penstock alignment and powerhouse locations for evaluating subsurface information.
UAV (Drone) Mapping to evaluate the damage after Gorkha Earthquake 2015 of Kaligandaki River Landslide Dam Area (83.8 Ha), Gorkha Darbar, Gorkha (2.65 Ha), Jure Landslide, Sindhupalchowk, (177 Ha): Total: 263.45 Ha
Our team carried out the topographical assessment and hazard mapping of the survey area using UAV (Drone) Imaging (263.45 Hectares) and GIS of:
- Kaligandaki River Landslide Dam Area (83.8 Ha)
- Gorkha Darbar, Gorkha (2.65 Ha)
- Jure Landslide, Sindhupalchowk, (177 Ha)
To assist in the research conducted by International Consortium on Geo-disaster Reduction (ICGdR) to evaluate the damages after Gorkha Earthquake 2015.
Consulting services for Geophysical Investigation using Electrical Resistivity Tomography (ERT) Survey at Mahendra Cave and Bat Cave Pokhara, Nepal
GSI conducted ERT survey at Mahendra Cave and Bat Cave in Pokhara to determine the extension of existing voids/ cavities in the project area to prepare a master plan for the two cave areas which are major tourist destinations.
Consulting services for Prefeasibility Study for the Ghorahi Swargadwari Cable Car Project (Geological and Geotechnical Perspectives)
GSI carried out preliminary geological and geotechnical investigation of cable car alignment from Ghorahi, Dang to Swargadwari, Pyuthan in two stages with a connecting hill road. Walkover survey of the alignment with special emphasis on the geological and geotechnical setting of proposed tower locations was carried out. The ropeway alignment was divided into two segments of 2.59 km (Ghorahi to Dhimdhime Danda) and 8.16 km (Kaulepani to Swargadwari).