Use of photo-based 3D photogrammetry in analysing the results of laboratory pressure grouting tests

This paper presents a non-destructive, low-cost, photo-based, 3D reconstruction technique for characterizing geo-materials with irregular shapes of a relatively large size. After being validated against two traditional volume measurement methods, namely the vernier caliper method and the fluid displacement method for regular and irregular shapes, respectively, 3D photogrammetry was used to analyse the grout bulbs formed in laboratory pressure grouting tests. The reconstructed 3D mesh model of the sample provides accurate and detailed 3D vertex data, which allowed the volume, densification efficiency and bleeding behaviour of the grout bulbs to be analysed. Comparing the bulb section views at different grouting pressures also offers an intuitive observation of the grout development and propagation process. Moreover, the 3D vertex data and surface area included in the model are of great importance in validating numerical predictions of the pressure grouting process and analysing the interface shear resistance of grouted soil nails or anchors. Compared to existing approaches, the new 3D photogrammetry method possesses several key advantages: (a) it does not require expensive, specialized equipment; (b) samples are not destroyed or modified during testing; (c) it allows to reconstruct objects of various scales and (d) the software is public domain. Therefore, the adoption of this 3D photogrammetry method will facilitate research in the pressure grouting process and can be extended to other problems in geotechnical engineering.

[1]  K. Soga,et al.  Fracturing of sand in compensation grouting , 2008 .

[3]  S. Sloan,et al.  Experimental investigation of pressure grouting in sand , 2016 .

[4]  KimJong-Sun,et al.  Effect of pressurized grouting on pullout resistance and group efficiency of compression ground anchor , 2012 .

[5]  Shanyong Wang,et al.  A new laboratory apparatus for studying dynamic compaction grouting into granular soils , 2013 .

[6]  R. Horn,et al.  Aggregate and Soil Clod Volume Measurement: A Method Comparison , 2013 .

[7]  R. Te Grotenhuis,et al.  Fracture Grouting in Theory: Modelling of Fracture Grouting in sand , 2004 .

[8]  Adam Bezuijen,et al.  Compensation grouting: Mechanisms determining the shape of the grout body , 2012 .

[9]  Mark L. Rivers,et al.  Comparison of image segmentation methods in simulated 2D and 3D microtomographic images of soil aggregates , 2011 .

[10]  H. Gerke,et al.  Noncontact Shrinkage Curve Determination for Soil Clods and Aggregates by Three-Dimensional Optical Scanning , 2007 .

[11]  Peter L. Falkingham,et al.  Acquisition of high resolution three-dimensional models using free, open-source, photogrammetric software , 2012 .

[12]  Kenichi Soga,et al.  Factors Affecting Long-Term Efficiency of Compensation Grouting in Clays , 2003 .

[13]  Á. Gómez‐Gutiérrez,et al.  Using 3D photo-reconstruction methods to estimate gully headcut erosion , 2014 .

[15]  John S. Selker,et al.  An Image-Based Method for Determining Bulk Density and the Soil Shrinkage Curve , 2012 .

[16]  Abdelhafid Khelidj,et al.  Experimental study of cement grout: Rheological behavior and sedimentation , 2003 .

[17]  R J Krizek,et al.  Effect of Preparation Technique on Permeability and Strength of Cement-Grouted Sand , 1994 .

[18]  K. Rollins,et al.  Jet Grouting to Increase Lateral Resistance of Pile Group in Soft Clay , 2009 .

[19]  L. Su Laboratory pull-out testing study on soil nails in compacted completely decomposed granite fill , 2006 .

[20]  Kenichi Soga,et al.  Laboratory investigation of multiple grout injections into clay , 2004 .

[21]  D. Hirmas,et al.  Bulk Density Determination by Automated Three‐Dimensional Laser Scanning , 2008 .

[22]  L. Chu,et al.  Study on the interface shear strength of soil nailing in completely decomposed granite (CDG) soil , 2003 .

[23]  Ka Chi Lam,et al.  Experimental study of the effect of fines content on dynamic compaction grouting in completely decomposed granite of Hong Kong , 2009 .

[24]  H. Brouwers,et al.  Bleeding characteristics for viscous cement and cement-bentonite grouts , 2007 .

[25]  Biswajeet Pradhan,et al.  Soil–Nail Pullout Interaction in Loose Fill Materials , 2006 .

[26]  Rainer Horn,et al.  Three-dimensional quantification of intra-aggregate pore-space features using synchrotron-radiation-based microtomography , 2008 .

[27]  Hangseok Choi,et al.  Pullout Resistance Increase of Soil Nailing Induced by Pressurized Grouting , 2012 .