纤维塑性混凝土在活动断裂带隧道设计中的力学试验

Mechanical Test of Fiber Plastic Concrete in Tunnel Design of Active Fracture Zone

铰接式设计被认为是一种有效的抗断层措施,可以防止断层运动对隧道衬砌造成的破坏。针对供水工程引水隧道,研制了一种新型塑性混凝土。通过抗压强度、劈裂抗拉强度、延展性和韧性确定混凝土的力学特性。结果表明:随着纤维体积分数的增加,塑性混凝土的抗压强度呈先减小后增大的变化趋势。劈裂抗拉强度随之增大,但增速逐渐变缓。纤维塑性混凝土具有良好的延性和韧性,能够吸收变形,保护了刚性节点不被完全破坏。随着纤维体积分数的增加,韧性指数线性增加,变形性能得到改善。

The articulated design is considered as an effective anti-fault measure to prevent the damage of tunnel lining caused by fault movement.In this paper,a new type of plastic concrete is developed for diversion tunnel of water supply project.The mechanical properties of concrete are determined by compressive strength,splitting tensile strength,ductility and toughness.The results show that the compressive strength of plastic concrete decreases first and then increases with the increase of fiber volume fraction.The splitting tensile strength increases with the increase of fiber volume fraction,but the increase rate gradually slows down.Fiber plastic concrete has good ductility and toughness,which can absorb deformation,and protect the rigid joints from being completely destroyed.With the increase of fiber volume fraction,the ductility index increases linearly,and the deformation property is improved.