Study on prestress loss and rheological coupling model of anchor cables in expansive soil layers#br#
LI Tao1，CAI Haibo1，LIU Bo1，2，LUO Xinghao1，QIAN Xiao3#br#
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；2. State Key Laboratory of Deep Geotechnical Mechanics and Underground Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；3. Sichuan Chengdu Xing Shu Basic Engineering Company，Chengdu，Sichuan 610072，China)
Abstract：Bolting effect of prestressed anchor cables in expansive soil layers is greatly affected by the water content of the stratum，and the prestress loss of the anchor cable is closely related to the stress relaxation of the soil. Taking the expansive soil in Chengdu area，Sichuan，as the research object，indoor model tests were performed to study the prestress loss law of pretressed anchor cables in the expansive soil layer with four different water contents. In terms of the unique viscoelastic-plastic mechanical characteristics of expansive soils，a strain-equalization calculation model of expansive soil-anchor coupling effect and the corresponding constitutive and relaxation equations were proposed. Comparison between the developed model and model test results also carried out. The results show that the prestress attenuation can be divided into rapid attenuation，slow attenuation and relative stabilization stages，and that the attenuation speed and amplitude of prestressed anchor cables increase with increasing the initial water content of the expansive soil layer. The initial prestress loss of the prestressed anchor cable in the expensive soil layer can reach up to 80% of the total prestress loss. The calculation results by the coupling model is basically consistent with the test data，which indicate that the model is capable to be used to evaluate the bolting effect of anchor cables in soil layers with known physical parameters.
李 涛1，蔡海波1，刘 波1，2，罗兴浩1，钱 霄3. 膨胀土地层锚索预应力损失与流变耦合模型研究[J]. 岩石力学与工程学报, 2020, 39(1): 147-155.
LI Tao1，CAI Haibo1，LIU Bo1，2，LUO Xinghao1，QIAN Xiao3. Study on prestress loss and rheological coupling model of anchor cables in expansive soil layers#br#. , 2020, 39(1): 147-155.
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2020, Vol. 39 
