佛寺水库坝顶路面裂缝调查及分析

Investigation and analysis of pavement crack on dam crest of Fosi Reservoir

在对佛寺水库坝顶裂缝情况详细普查的基础上,通过挖探坑和灌浆方法,对裂缝进行了针对性的调查分析。结合普查与调查分析成果,对佛寺水库坝顶裂缝进行了成因分析。得出如下结论:(1)坝顶裂缝并未延伸至原砂石路下垫层,亦即未影响到心墙部位,表明坝顶混凝土路面裂缝不是心墙与坝壳料沉降不均匀造成的。(2)坝顶混凝土路面砂砾石层在顺河向分布厚度不均,是造成坝顶混凝土路面裂缝的内因。车辆超过坝顶混凝土路面设计荷载是造成其裂缝的外因。同时由于坝顶在上游侧设置有防浪墙,车辆通过坝顶过程中本能地偏向下游侧行驶,这也是造成坝顶混凝土路面不均匀裂缝的外因。(3)建议对坝顶裂缝进行处理,限制坝顶路面通过社会车辆,同时加强监测与巡视检查,防止坝顶裂缝进一步发展。

On the basis of general survey on the cracking situation at the crest of the Fosi Reservoir dam,a specific study on the cracks was conducted using the test boring and grouting methods.The cause of cracks on the dam crest of the Fosi Reservoir was analyzed.The results suggested that(1)the cracks at the crest do not extend to the underlayer of the original gravel road,i.e.,no influence on the core wall,which indicates that the cracks on the concrete pavement are not caused by the non-uniform settlement between the core wall and dam shell;(2)The non-uniform distribution of the gravel layer material of the concrete road is the primary cause of the cracks,and the higher loading from the vehicles than the design loading of the road is the secondary cause.Meanwhile,due to the existence of wave walls in the upstream of the crest,vehicles tend to move towards the downstream side,leading to the non-uniform cracks on the dam crest;and(3)the cracks at the dam crest need to be fixed,the number of public vehicles needs to be limited,and more monitoring and perambulatory inspection are proposed to prevent the crack propagation.