DEFORMATION AND STRESS CHARACTERISTICS OF TUNNEL-TYPE ANCHORAGE MODEL ON SCALE 1∶10
PANG Zhengjiang1，SUN Haojie2，LAI Qibo2，YANG Yi1，FAN Lei1
(1.Changjiang River Scientific Research Institute，Wuhan，Hubei 430010，China； 2. Guanshan Investment Development Co.，Ltd.，of Daishan County，Zhejiang Province，Daishan，Zhejiang 316200，China)
Abstract：During field scale model test of tunnel-type anchorage，the deformation of anchorage and surrounding rock are monitored by multipoint displacement meter，the strain of anchorage are monitored by strain gauge，the deformation and its history of anchorage and surrounding rock are monitored by AE. Then，3D numerical simulation of test are also performed，the analysis is focused on the deformation and stress characteristics of tunnel-type anchorage. The results show that anchorage model undergo four phases in turn：When the load is less than 5.8–7.1 MN，the deformation of anchorage model is in elastic phase. When the load is less than 19.5 MN，the deformation of tunnel-type anchorage model is in elastic-plastic phase. When the load is greater than 19.5 MN and less than 23.7 MN，the deformation of tunnel-type anchorage mode is in the yield phase. When the load is greater than 23.7 MN，the deformation of tunnel-type anchorage mode is in rheological phase. And according to the developing of the plastic zone，the potential slip surface of tunnel-type anchorage is the bottom contact surface between anchorage and the rock mass. Rock mass above the rear anchorage would be damaged due to excessive tensile stress，which can lead to instability of tunnel-type anchorage.
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2015, Vol. 34 
