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Pullout Test for Geogrid Reinforced Expansive Rock/Soil for Beijing Western Sixth Ring Highway and Its Numerical Emulation

Author: ZhangZhiBin
Tutor: YangHePing
School: Changsha University of Science and Technology
Course: Road and Railway Engineering
Keywords: Flexible Support Technology Expansive soils Pull-out test Geogrid Test conditions FLAC3D
CLC: U412.22
Type: Master's thesis
Year: 2011
Downloads: 29
Quote: 0
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Abstract


Flexible support technology for the first time for governance Beijing West the Sixth Ring sedimentary swelling rock (soil ) Cut Slope has been successful in supporting body friction between the geogrid and expansive soil filler , U - shaped nails anchoring the upper and lower grille anti package connected constitute slope overall strength and pull-out tests to determine the best method of interaction . Expansion the soil reinforced mechanism of action , interface parameters and optimize the design methods , the paper carried out the West Sixth Ring swelling rock ( soil ), reinforced pullout test of its numerical simulation . Pullout test system for tendons soil interface test suitable conditions for large-scale CNC determine the CS-LB01 , west of Sixth Ring three expansive soil as filler , using two grid stiffened overlying load by changing the drawing rate , soil samples moisture content and the completion of the consolidation time 33 set of pull-out tests , the impact of various factors , and consider the actual working conditions based on this analysis to propose a suitable test conditions . To explore the the drawing force grille strength , the relationship between the geometric characteristics , Hubei special production of the five grille and # 2 soil samples for the material to carry out a series of tests , the pulling force is not only related to the strength of the reinforcement , but also also buried in length when the same number of transverse ribs , reinforced materials should be selected considering the implementation of flexible retaining these two factors . Analog the flexible retaining the actual conditions , design and carry out the grille tail of two nail fixed pullout tests , the results show that not add nail pulling force than the fixed value of the test has improved greatly , indicating that U the type nail anchor improve flexible retaining overall strength played an important role . Finally , the use of FLAC3D simulation the pullout test process reinforced expansive soil , grille FLAC unique the Geogrid structural unit soil samples chosen Mohr - Coulomb constitutive model obtained drawing force displacement curve shape with the test machine automatic drawing almost the same , and also get the grill effectively pulled out of the soil displacement field distribution , distribution of vertical stress , level of tendons soil interface to the distribution of stress distribution and interface Friction , reinforced mechanism for interface parameter analysis provide a reference .

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CLC: > Transportation > Road transport > Road works > Planning, surveying and design > Survey > Soil,geological and geographical investigation
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