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1 工程概况输水洞主洞长310m,洞身为Ⅲ类围岩,断面为圆形,钢筋混凝土衬砌厚度0.8～1.2m不等,衬砌后洞径为3.5m,采用C30混凝土,抗渗等级为S8。洞身衬砌全部结束后,检查发现16、17、18、21、22、23、24、26仓均有贯穿裂缝,共8条,且产生位置全部在中部(分缝中部左右),缝宽均小于0.2mm,长度共约68.4m。2 施工措施2001年12月15日,发现有贯穿裂缝,正值冬季,雨水少,地下水不丰富,裂缝暂无渗水现象;若不及时处理,隧洞投入运行后,通过这些裂缝将会发生洞内的内水外渗,导致围岩软化,洞体变形;同时,外水内渗,对洞体混凝土产生较为严重的浸蚀
1 Project Overview Water hole main hole length of 310m, the cave body is Ⅲ type rock, the section is circular, reinforced concrete lining thickness of 0.8 ~ 1.2m, after lining the tunnel diameter of 3.5m, the use of C30 concrete, impermeability level For the S8. After the completion of the tunnel lining, the inspection found that 16,17,18,21,22,23,24,26 positions have cracks throughout, a total of eight, and the location of all in the middle (left and right joints), the width of the joints Less than 0.2mm, a total length of about 68.4m. 2 Construction Measures December 15, 2001, found through cracks, coincides with the winter, less rainfall, groundwater is not rich, the phenomenon of temporary water seepage cracks; if not treated, the tunnel into operation, through these cracks will occur within the cave Of the water infiltration, leading to softening of the surrounding rock, deformation of the hole; the same time, external water infiltration, the concrete on the hole more serious erosion