不同类型预应力锚索锚固性能现场试验对比研究

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Abstract Based on the elasto-plastic analysis of shear stress distribution in anchorage section，field destructive tests were carried out on the tension-concentrated anchor cable(TCAC)，the tension-dispersed anchor cable (TDAC) and the pressure-dispersed anchor cable(PDAC). The comparative analysis was made regarding the shear stress distribution characteristics，the bearing capacity and the load-displacement curve. In the elastic stage，the peak shear stress appeared in the range of 0.5 m near the acting point of concentrated force and increased with the load growing. In the plastic period，debonding slippage occurred in the range of 0.5 m near the acting point of concentrated force，and the peak shear stress was shifted to the middle of anchorage body gradually. The residual shear stress on debonding section was about 1/3 of the peak value. TDAC has more uniform shear stress distribution and longer effective anchorage length，its carrying capacity was 31.1% higher than TCAC. Due to the radial expansion of anchorage body under pressure，the bond strength between PDAC and soil was improved，which made the PDAC?s carrying capacity to increase by 17.7% compared with TDAC. It can be seen from the load-displacement curve that the PDAC had better displacement ductility and deformation resistivity，therefore，it had advantages in soil anchoring.

Key words： geotechnical engineering pressure type cables tension type cables shear stress distribution carrying capacity field test

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http://www.rockmech.org/EN/Y2016/V35/I2/275

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