Preliminary study on the progressive failure of tunnel-type anchorage based on strain-softening theory
WANG Dongying1，2，TANG Hua1，YIN Xiaotao1，DENG Qin1，ZHOU Wanchun3
(1. State Key Laboratory of Geo-mechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Broadvision Engineering Consultants，Kunming，Yunnan 650041，China)
Abstract：The failure patterns of tunnel-type anchorage could reveal the component and stage characteristics of its bearing capacity. Also it is the fundamental scientific problems to study the progressive failure process and the destructive patterns of tunnel-type anchorage. In order to figure out the failure process and the bearing characteristics of tunnel-type anchorage，the strain-softening constitutive and the searching methods of slope critical slipping surface are applied to simulate the generation and evolution of the failure surface of tunnel-type anchorage. Then the failure mode is also acquired. Besides，the degradation process of the mechanical parameters of rock is studied as well. Also，the distribution of additional stress and shearing resistance along the axis of anchor plug are analyzed in this paper. Finally，the bearing characteristic of tunnel-type anchorage is in-deep analyzed. Some conclusions are draw as follows：(1) The failure of tunnel-type anchorage happens progressively. And the failure surface always generates from the bottom of the anchor plug and evolves towards the upper surrounding rock until the anchorage is pulled out totally. Notably，the failure pattern of the anchorage is neither the shear failure along the interface of anchor plug and the surrounding rock nor the cone-shaped failure，but the funnel-shape which is narrow in the bottom and wide in the top. (2) The distribution pattern of additional stress along the axis of anchor plug is similar to trapezoid before the uplift resistances of anchorage achieving the ultimate bearing capacity. And the closer to the bottom face of anchor plug，the greater the value of additional stress. (3) The mechanical parameters on the failure surface and surrounding rock where the stress is disturbed degrade gradually in the failure process. (4) The bearing capacity of tunnel-type anchorage also changes progressively with the failure process. And the initial resistance of the study project is while the ultimate bearing capacity is kN.
王东英1，2，汤 华1，尹小涛1，邓 琴1，周万春3. 基于应变软化的隧道锚渐进破坏过程探究[J]. 岩石力学与工程学报, 2019, 38(S2): 3448-3459.
WANG Dongying1，2，TANG Hua1，YIN Xiaotao1，DENG Qin1，ZHOU Wanchun3. Preliminary study on the progressive failure of tunnel-type anchorage based on strain-softening theory. , 2019, 38(S2): 3448-3459.
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2019, Vol. 38 
