Method for determining column-hemispherical permeation radius with time-varying property of power-law cement grout and tortuosity of rock and soil mass

US11733146B1 · kind B1 · utility

Assignee

• Kunming University of Science and Technology · CN

Inventors

• Zhiquan Yang · Longbeilingcun, CN
• Mao Chen · Suzhou, CN
• Yingyan Zhu · Kunming, CN
• Yi Yang · Baoshan, TW
• Wentao Chen · Sammamish, US
• Yuqing Liu · Hangzhou City, CN
• Muhammad Asif Khan · White Bear Lake, US
• Bihua Zhang · Kunming, CN
• Hanhua Xu · Kunming, CN
• Tianbing Xiang · Kunming, CN
• Jie Zhang · Beijing, CN

Key dates

• Filing date: Nov 30, 2022
• Grant date: Aug 22, 2023
• Expiry date: Nov 30, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/383
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining a column-hemispherical permeation radius with time-varying property of power-law cement grout and tortuosity of rock and soil mass is provided, including: acquiring a porosity ϕ of rock and soil mass and a corresponding permeation coefficient K by geotechnical tests, measuring a groundwater pressure P0 at a grouting point and determining tortuosity ξ of rock and soil mass; acquiring an initial consistency coefficient c0, a rheological index n and a time-varying property coefficient k of power-law cement grout with a designed water to cement ratio by rheological tests, and determining the viscosity of water μw; acquiring grouting parameters, including a grouting pressure P1, grouting time t, a number m of grouting holes of a side surface of a grouting pipe and a grouting hole radius r; and solving a column-hemispherical permeation grouting diffusion radius R considering coupling effect both the tortuosity of rock and soil mass and the time-varying property of power-law cement grout.