(1. Key Laboratory for Urban Underground Engineering of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China；2. State Key Laboratory of Hydroscience and Engineering，Tsinghua University，Beijing 100084，China)
Abstract：The soft joints are widely applied in high concrete-faced rockfill dams. This type of joint is usually used to prevent the extrusion damage of the concrete face. To reproduce the actual loading and deformation conditions of soft joint，a test apparatus is developed. A series of laboratory tests are performed by using the rubber as the soft filler. The loading and deformation features of soft joint are analyzed for different loading status. The test results indicate that the deformation of soft joint can be divided into three stages：the initial stage，the steady stage，and the hardening stage. Due to the strong constrained condition，strong squeeze-out is observed during the hardening stage，giving rise to rapid increase of extrusion modulus. Based on the test results，a polynomial extrusion model is proposed. This model is applicable for the finite element simulation and the evaluation of soft joint.
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2019, Vol. 38 
