水泥混凝土土工布隔离层剪切与排水性能研究

Study on Performance of Shearing and Drainage of Geotextile Interlayer for Cement Concrete

为了研究土工布作为隔离层时混凝土板与基层间的层间接触状态,设计了室内顶推试验,并对比乳化沥青隔离层的摩阻力-位移曲线和直接浇注的顶推试验结果,得知土工布作为隔离层时能减小混凝土板与基层间的层间黏结,使混凝土板与基层之间处于非黏结状态,这样可以有效减小层间摩阻力,降低温度应力。同时为了研究土工布作为隔离层时水泥混凝土路面的实际排水效果,设计了模拟排水试验,并对比沥青隔离层的试验排水效果,得知土工布作为隔离层能有效排除基层上的水分,并且水量越大,排水效果越良好,但需要对基层做一些防水措施,以防垂直渗流对基层的破坏。

To study the interface condition between concrete slab and base using geotextile as interlayer, we designed a series of push-out test, and then compared the friction-displacement curve of emulsified asphalt interlayer and the push-out test result of concrete cast directly on base. It is found that geotextile as interlayer can weaken the interface bond strength between concrete slab and base, make concrete slab and base in the state of non-bonding, it can reduce the frictional force at the interface and temperature stress effectively. To study the actual drainage effect of cement concrete pavement using geotextile as interlayer, we also designed a series of simulation drainage tests, and then compared the test drainage results of the asphalt interlayer. It is found that geotextile as interlayer can remove the water on base effectively, the more the water, the more effectively the water drainage effect, but it must take some water-proofing measures to protect base from vertical seepage.