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Evaluation on Borehole Stability of Ru River HDD Crossing
Ru River HDD crossing, one of the pipe installation projects of West-East Natural Gas Transmission Project II, involves sands and partly cobbles along the crossing path. Borehole stability plays a most critical role for project success. This paper's focus is on the evaluation of borehole stability based on both the project design document and geo-investigation data to support the HDD construction project. Ru River HDD crossing was designed to be 3300 m in drive length, 711 mm in diameter, and 42 m in cover depth. Geo-investigation provided soil lab testing data, including: soil description, density, void ratio, compression modulus, cohesion, internal friction angle and standard inertia coefficient. Soil arching, soil pressure, mud pressure, consolidation coefficient and dynamic disturbance resulted by reamer are taken into account to calculate the soil stability upper the borehole, believed to be the potential collapse point of the borehole. Then, the borehole stability at different depths of the Ru River HDD project was divided into five levels based on the calculation result and resistance range. Treatment ideas and suggestions were also put forward to decrease the risk of borehole instability of HDD crossing project.
Evaluation on Borehole Stability of Ru River HDD Crossing
Ru River HDD crossing, one of the pipe installation projects of West-East Natural Gas Transmission Project II, involves sands and partly cobbles along the crossing path. Borehole stability plays a most critical role for project success. This paper's focus is on the evaluation of borehole stability based on both the project design document and geo-investigation data to support the HDD construction project. Ru River HDD crossing was designed to be 3300 m in drive length, 711 mm in diameter, and 42 m in cover depth. Geo-investigation provided soil lab testing data, including: soil description, density, void ratio, compression modulus, cohesion, internal friction angle and standard inertia coefficient. Soil arching, soil pressure, mud pressure, consolidation coefficient and dynamic disturbance resulted by reamer are taken into account to calculate the soil stability upper the borehole, believed to be the potential collapse point of the borehole. Then, the borehole stability at different depths of the Ru River HDD project was divided into five levels based on the calculation result and resistance range. Treatment ideas and suggestions were also put forward to decrease the risk of borehole instability of HDD crossing project.
Evaluation on Borehole Stability of Ru River HDD Crossing
Zeng, Cong (author) / Zhou, Pei (author)
International Conference on Pipelines and Trenchless Technology ; 2013 ; Xi'an, China
ICPTT 2013 ; 1151-1160
2013-10-01
Conference paper
Electronic Resource
English
Seismic effects , Pipes , Leakage , Boreholes , Trenchless technology , Drilling , Gas pipelines , Pipelines , Assets
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