JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2016, Vol. 46 ›› Issue (1): 49-55.doi: 10.6040/j.issn.1672-3961.0.2014.374

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Grouting technology and application of the Orientation grouting in weak area of surrounding rock tunneling

PAN Guangming, ZHENG Dongzhu   

  1. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250012, Shandong, China
  • Received:2014-12-23 Online:2016-02-20 Published:2014-12-23

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Abstract: Orientation grouting technology was proposed to solve the problem of poor grouting effect and higher grouting risk of weak surrounding rock. Reliable data of intensity resistance and pressure resistance were acquired by safety experiment of orientation grouting device. The maximum grouting ending pressure, which could assure the reinforce demand of weak surrounding rock, was acquired by safety grouting ending pressure experiment. Grouting material proportioning and safety and initial setting time were acquired by initial setting time experiment of Grouting material. The results showed that the swell stopper could resist at 12 MPa grouting pressure when the safety filling pressure of swell stopper was 1.5 MPa. Under the condition of non-pressure, the cross section of grouting was 1.0~1.2 times of the cross section of grouting pipe. Safety grouting ending pressure was between initial reinforce strength and again splitting pressure, approximately 2.5~3.0 MPa. It was safe when the grouting material proportioning was between 1∶1~2∶1 and initial setting time was between 150~300 s. Orientation grouting technology could meet the safety separate-pressure demand, and controll the grouting diffusion range.

Key words: advanced curtain grouting, weak area, swell stopper, surrounding rock, orientation grouting

CLC Number: 

  • U453.6+1
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