Experimental Study and Strength Analysis on Reinforcement-module Connection of Modular Reinforced Retaining Wall
The reinforcement-module connection strength is one of the important factors affecting the stability of modular reinforced retaining walls.To explore the reasonable connection methods for modular reinforced retaining walls,3 types of reinforcement-module connection methods were designed and manufactured,including planar,serrated,and self-embedded.The development rule and failure mode of connection strength of 3 connection methods were tested through pull-out tests.Based on this,the strength calculation method for friction type reinforcement-module connection was established,and the example analysis was conducted.The result indicates that the strengths of 3 types of connections have basically the same development pattern,all of which belong to friction type connections.Under the same normal stress and apparent contact length,the strength of planar ribbed plate connections is the lowest.The strength of linear segment of self-embedded connection is higher than that of serrated connection,and the strength limit of the latter is higher than that of the former.The normal stress at interface and the anchorage length of reinforcement have significant influence on the connection strength,and there is a critical effect.When the normal stress is less than the critical value of normal stress,and when the anchorage length is less than the critical length,the interface strength and normal stress have linear relation.The reinforcement-module connection fails due to the withdrawal of reinforcement.When the normal stress is greater than the critical value,or the anchorage length is greater than the critical length,the strength envelope line is a horizontal line,and the reinforcement plate connection fails due to mechanical damage to the reinforcement material.The linear segment of strength envelope of planar connection passes through the coordinate origin,while there is a type of interface cohesive force between serrated and self-embedded connections.Based on the experimental results,the strength expression for friction type reinforced modular connections and the stability analysis method for reinforcement-module connections of modular reinforced retaining wall were established,and the example analysis was conducted.
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