The compaction effect on the performance of a compaction-grouted soil nail in sand
- PDF / 1,503,046 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 24 Downloads / 269 Views
(0123456789().,-volV)(0123456789(). ,- volV)
RESEARCH PAPER
The compaction effect on the performance of a compaction-grouted soil nail in sand Xinyu Ye1 • Shanyong Wang2 • Sheng Zhang1 • Xiong Xiao3 • Fang Xu1 Received: 2 March 2020 / Accepted: 24 June 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, two series of physical modeling experiments, with and without a grouting process, were conducted under different grouting pressures to study the effect of compaction grouting on the performance of compaction-grouted soil nails. In addition, a hyperbola-based model was proposed to describe the variation of the pullout forces with and without grouting. Some of the main conclusions drawn are as follows. First, the compaction effect initially influences the mobilized pullout force, but not the final stage of pullout; the large difference between the two series of tests in regard to the pullout force at the initial stage led to the first part of this conclusion. However, the final pullout force results of the tests, both those with and those without grouting, were similar. Second, once the soil condition changes, the compaction effect on the performance of a soil nail depends on the grouting pressure rather than the diameter of the grout bulb. Third, the difference in the soil response (i.e., vertical dilatancy and the vertical and horizontal squeezing effects) derived from the compaction grouting effect will result in the initial difference in the increased rate of the pullout force between the tests with a grouting process and those without. Finally, a hyperbola-based model was proposed to describe the variation of the pullout force of the model tests with and without grouting, through which the pullout force is available of prediction for the given diameter of grout bulb and pullout displacement. Keywords Compaction effect Hyperbolic relationship Physical model test Pullout force Soil nail
1 Introduction Compaction grouting has a long history. The impact of compaction grouting on the surrounding soil can be explained in terms of soil densification, stress redistribution and soil displacement, the application of which can largely enhance soil strength [5, 10] or bearing capacity [6, 43]. Based on the impact, compaction grouting was used to compensate building settlements in the 1950s [20, 28]. A
& Sheng Zhang [email protected] 1
School of Civil Engineering, Central South University, Changsha 410075, Hunan, China
2
Australian Research Council Centre of Excellence for Geotechnical Science and Engineering, Faculty of Engineering and Built Environment, University of Newcastle, University Dr., Callaghan, NSW 2308, Australia
3
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
couple of decades later, compaction grouting was used to increase density and reduce soil permeability [18, 27] and prevent liquefaction during earthquakes [13, 19]. Furthermore, the combination of compaction grouting with other ground improvement te
Data Loading...
