温度应力下边坡细石混凝土喷层开裂问题实测研究

Experimental Study on Temperature Stress and Crack of Fine Stone Concrete Shotcrete Layer in Slope

针对细石混凝土喷层开裂,从而失去其作用,尤其是喷层内的钢筋网失去保护而锈蚀的问题。为此,根据连云港中云台山开挖深度约200 m的路堑岩质高边坡约10年的监测数据,开展细石混凝土喷层开裂问题的分析,结果表明,对于岩体变形大的区域,坡面钢筋网轴力与温度呈现正相关;根据应变协调原则,细石混凝土存在顺坡向拉裂问题,是坡面细石混凝土出现开裂原因之一;由于存在边坡岩体向坡内产生水平位移的部位,导致坡面细石混凝土喷层存在被揭起现象,这是坡面细石混凝土出现破坏的另一原因。

In view of the cracking of the fine stone concrete spray layer, it loses its function, especially the steel mesh in the spray layer loses its protection and corrodes. To this end, according to the monitoring data of about 10 years of cutting rocky high slopes with a depth of about 200 m in Zhongyuntai Mountain in Lianyungang, the analysis of the cracking of the fine stone concrete sprayed layer was carried out. The axial force of the steel mesh on the slope is positively correlated with the temperature. According to the principle of strain coordination, the fine-stone concrete has the problem of pulling cracks along the slope, which is one of the reasons for the cracking of the fine-stone concrete on the slope. The position of horizontal displacement leads to the phenomenon that the sprayed layer of the fine stone concrete on the slope surface is lifted, which is another reason for the damage of the fine stone concrete on the slope surface.