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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摘要在对锚索锚固段剪应力分布模式进行弹塑性理论分析的基础上，开展拉力集中型、拉力分散型、压力分散型锚索的现场破坏性试验，对3类锚索的剪应力分布特征、承载能力、荷载–位移曲线进行对比分析，结果表明：在弹性状态下，3类锚索锚固体上的峰值剪应力均出现在集中力作用点近端0.5 m范围内，且随着荷载增加而增大；进入塑性状态后，上述0.5 m范围最先出现脱黏滑移，峰值剪应力逐渐向锚固体中部转移，脱黏段的残余剪应力约为峰值的1/3；由于拉力分散型锚索的剪应力分布更加均匀、有效锚固段长度更长，其承载能力相比拉力集中型提高31.1%；压力分散型锚索锚固体由于受压产生径向膨胀，其与土体之间的黏结强度增大，因而承载能力比拉力分散型提高17.7%；从荷载–位移曲线来看，压力分散型锚索具有更好的位移延性和抗变形能力，在土体锚固中优势明显。

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关键词 ：岩土工程, 拉力型锚索, 压力型锚索, 剪应力分布, 承载能力, 现场试验

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

引用本文:

刘永权1，2，刘新荣1，2，杨忠平1，2，康景文3. 不同类型预应力锚索锚固性能现场试验对比研究[J]. 岩石力学与工程学报, 2016, 35(2): 275-283.
LIU Yongquan1，2，LIU Xinrong1，2，YANG Zhongping1，2，KANG Jingwen3. Field test on anchorage performance of different types of prestressed cables. , 2016, 35(2): 275-283.

链接本文:

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

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