IN PLACE INCLINOMETER APPLICATION DOSSIER Msheireb Station, Major Stations, Doha Project Metro Location Doha, Qatar Client Qatar Rail Company Samsung C&T - Obrascon Huarte - Qatar Building Co. JV (SOQ JV) - 2013 to 2016 Contractor Consolidated Contractors Group S.A.L - 2016- 2019 The Louis Berger Egis Rail Joint Venture Consultants (LBER JV) Duration 2013 - 2019 Project overview Key data on IPIs Doha Metro is the world’s largest infrastructure project. Eighty- • A total of 14 no. IPIs were installed in two km of metro tunnel incorporating 26 stations will run Msheireb station-10 no. in diaphragm wall underground in Phase 1. Msheireb Station will serve as the heart of the station box and 4 no. in soil behind of Phase 1 as it is the major interchange station of three metro the wall. Gage length of IPIs was 3m. lines – with Red and Green Lines running parallel and Gold Line • Up to 13 no. biaxial SDI-12 tilt sensors situated underneath. It is the largest underground station in were installed a in a single inclinometer Doha situated at the corner of Msheireb Downtown Doha gage well. development. The station lies between ~ 15 m to 40 m below ground level. • Gage wells were constructed of 70 mm o.d. ABS grooved casing up to 42 m The Msheireb Station in the centre of the metro already forms deep. the accumulation point of the whole system. All lines meet here, 12 TBM breakthroughs ended at this mammoth station alone. • In diaphragm wall, gage wells were Excavation for Msheireb Station, approximately 40 m below constructed within protective GI pipe cast ground level is one of the deepest excavations for metro in the in d-wall. Middle East, therefore, Instrumentation & Monitoring (I&M) • Logging was done automatically with a played an important role in the project. I&M scheme frequency of once in 2 hours. implemented by Encardio-rite was a mix of automatic and manual monitoring. In place inclinometers were a key • Data was available on the project’s web- component of the automatic monitoring and gave vital based data monitoring service in real-time information on diaphragm wall deformations. with automatic e-mail alerts. www.encardio.com INDIA: LUCKNOW | DELHI | KOLKATA | MUMBAI | CHENNAI | BANGALORE | HYDERABAD | J&K INTERNATIONAL: UAE | QATAR | BAHRAIN | GREECE | SINGAPORE | BHUTAN IN PLACE INCLINOMETER APPLICATION DOSSIER Cabo Raj Bhavan (Governor’s House) Project Slope stability of Cabo Hill Location Goa, India Client Water Resources Department Contractor ITD Cementation Consultants Geological Survey of India (GSI) Duration 2007 - 2017 Project overview Key data on IPIs Cabo Fort which houses the present Governor’s house or Raj • A total of 9 no. IPIs were installed for Bhawan in Goa was built around 1540 AD to guard the entrance slope monitoring. to both the Mandovi and Zuari rivers. Cabo fort is the finest of • The IPIs were installed in gage wells the Raj Bhavans in India. constructed from 70 mm o.d. ABS The fort is located on Cabo Hill at a height of 40 m above the inclinometer casing, sea. It is a two-storied monumental structure constructed with • Gage length of the IPIs was 2 m. 0.7 m thick walls comprising of laterite blocks in mud mortar. • Up to 12 no. SDI-12 bi-axial tilt sensors The hill slope was reported to have been undergoing a gradual were used in a single gage well distress due to natural processes over several decades with cracks appearing on the asphalted pavement in front of Chapel • Average depth of gage well was 24 m. and on the floor of the verandah. The parapet wall constructed • Automatic logging of IPIs was done twice around the edge of the steep slope adjacent to the Raj Bhavan per day in the rainy seasons May to had also developed cracks at many places indicative of September and in the rest, once per day. horizontal and lateral movement. The data was available on-line in real- time Encardio-rite’s web-based data The upper part of the slope was stabilized by using pre-stressed monitoring service. cable to tie up the fractured, hard lateritic media. The middle part of the slope was stabilized by installing shear interceptors using micro piles. Vertical sand piles were also provided to release the possible groundwater pressure. The toe part of the slope was stabilized with retaining walls. To monitor the distressed unstable slopes of Cabo Hill, GSI recommended field monitoring through instrumentation. The instrumentation scheme included monitoring of slope movement, settlement, water pressure and ground cracks. In place inclinometers played an important role in monitoring slope deformations. www.encardio.com Over 50 years of excellence through ingenuity IN PLACE INCLINOMETER APPLICATION DOSSIER Project Deira Waterfront Development Location Dubai, UAE Deira Waterfront Development L.L.C/ Client Investment Corporation of Dubai Dutch Foundation & Concrete Processing Contractor Company Consultants Coffey, COWI, Parsons Duration 36 month from May 2016 Project overview Key data on IPIs Deira Waterfront Development encompasses an expansion of • Eleven no. IPIs were installed for the urban fabric to the existing Deira community. It is one of the monitoring existing Green Line Metro most important development projects and involves the tunnel, gage length 2 m, with up to 9 no. construction of a number of new plazas, mixed-use buildings sensors in one gage well. and green open spaces. The project aims to develop the • Three no. IPIs were installed for seafront which will be unique and beautiful. monitoring existing Shindagha Road tunnel, gage length 2 m, with 10 Phase 1 of the project includes the development of almost 30 sensors in each gage well. plots along the waterfront, each plot having its own development and design. Plot-13 is located in the northern portion of Dubai in • Biaxial SDI-12 tilt sensors were used in the Deira District. The proposed Mixed Used Development at both sites. Plot 13 includes a maximum two-level basement (approximately • ABS grooved casing of 70 mm 10 m deep excavation) and is situated between the Al diameter was used to construct the Shindagha tunnel and Dubai Metro Green Line tunnel. gage well. The nearest edge of the shoring works was at 10 m from the • Automatic logging at every 4 hours with Dubai Metro Green Line tunnel and the south-eastern edge was real-time display on Encardio-rite’s located at a distance of 15 m from the existing Al Shindagha web-based data monitoring service. Road tunnel. • Automatic e-mail alters to project’s stakeholders and construction team on As the project involved heavy construction activities quite breach of trigger values. adjacent to tunnels, monitoring became necessary for safety of the two existing tunnels. IPIs were used for monitoring subsurface lateral movements which may affect the existing tunnels due to excavation and dewatering activities. www.encardio.com Over 50 years of excellence through ingenuity IN PLACE INCLINOMETER APPLICATION DOSSIER Note on excessive movements recorded by an IPI Progressive movements were noted in one of the in-place inclinometers (IPI) installed in the shoring wall in the vicinity of the Shindagha tunnel (refer to figure below). Upon breach of trigger level, to verify the readings, the IPI chain was removed. Subsequently, the readings were continued with the same manual inclinometer system, using which baseline reading of the inclinometer was established prior to installation of the IPI chain. The results confirmed the IPI’s behavior to a great extent. Readings collected from survey targets installed in the same section of the inclinometer on the shoring wall also confirmed the movements recorded. The contractor took preventive measures by providing additional anchoring and horizontal support at the section of the shoring system showing excessive deformation, based on the monitoring results. Upon further analysis of the cause of deformation, the recharge method using pressure jetting deployed at the site was determined to be the factor contributing to the deformations observed. It was also observed that the standpipe piezometer’s trigger limits, breach of which was the reason behind the recharging were also at the fault. www.encardio.com INDIA: LUCKNOW | DELHI | KOLKATA | MUMBAI | CHENNAI | BANGALORE | HYDERABAD | J&K INTERNATIONAL: UAE | QATAR | BAHRAIN | GREECE | SINGAPORE | BHUTAN .