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Title: Fundamental study of static and dynamic compaction grouting in completely decomposed granite soil in Hong Kong
Other Titles: Ying yong yu Xianggang tu de jing tai ya li guan jiang yu dong tai ya li guan jiang de ji li yan jiu
Authors: Wang, Shanyong (王善勇)
Department: Dept. of Building and Construction
Degree: Doctor of Philosophy
Issue Date: 2006
Publisher: City University of Hong Kong
Subjects: Grouting -- China -- Hong Kong
Notes: CityU Call Number: TA755.W36 2006
Includes bibliographical references (leaves 200-206)
Thesis (Ph.D.)--City University of Hong Kong, 2006
xxvii, 206 leaves : ill. ; 30 cm.
Type: Thesis
Abstract: The research described in this thesis focuses on the fundamental behavior of static and dynamic compact grouting in the soil of completely decomposed granite (CDG). Using the modified triaxial apparatus and newly-invented pulse wave creator, laboratory tests were performed to identify the critical controllable factors of static and dynamic compact grouting for optimizing the compaction effectiveness. Numerical study was carried out to improve the understanding of the static and dynamic compact grouting on the soil densified and the associated consolidation process of soil. Firstly, In order to study the behavior of soil when grouting is carried out in experimental tests, various types of standard tests, which include moisture content test, bulk density test, Protor tests, soil classification test, permeability test, and oedometer test are carried out to obtain the basic soil properties of the soil specimens. Moreover, the triaxial tests on the fundamental behaviour of the soil with different fine content in the saturated state under drained shearing are carried out, which particular attention is paid to the influence of different initial dry density with different effective confining pressure changing from 50 to 250kPa. Secondly, a set apparatus of triaxial tests was modified to study the static and dynamic compact grouting in soil. The most distinguished character of this laboratory apparatus is that it can simulate the triaxial condition of static and dynamic compact grouting in the field. In the tests, the effective confining pressure, the lateral pressure coefficiency (K), excess pore water pressure, back pressure, void ratio change, vertical and lateral deformation of specimen can be measured. In addition, the dynamic compact grouting pressure, dynamic compact grouting frequency, and dynamic compact grouting period can also be controlled. Thirdly, the compact grouting efficiency η ()/(minmaxeee−Δ) due to compact grouting was defined. The effect of injection rate, confining pressure and on the grouting efficiency in static compact grouting tests was studied. Meanwhile, the ground surface response due to static compact grouting was also investigated. Moreover, the study which focused on the effect of dynamic compact frequency, dynamic compact duration, effective confining pressure, K, initial dry density on the grout efficiency and mean shear strength enhancement of Hong Kong CDG was carried out. Moreover, the effect of fine content for eleven kinds of soils on the dynamic compact results was studied. Finally, finite element analysis was adopted for the simulation of the static and dynamic grouting in Hong Kong CDG. Specially, a Cam-Clay-Model-for-Cyclic-Loading was introduced in ABAQUS through its user subroutine UMAT to study the soil response due to vibro-compaction. The numerical results demonstrated the experimental results that the grouting efficiency of dynamic compact grouting method is typically 3-5 times higher than that using static compaction grouting.
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