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(一)砼防渗心墙的总体布置1.防渗心墙的轴线布置对防渗心墙的轴线布置曾研究过下述两种形式:(1)布置在上游坡174米高程的平台上,平台以下采用砼防渗墙结构,以上填筑粘土斜墙。这一布置虽可减少砼防渗墙的工作量,但由于平台场地窄,施工布置困难,轴线上游坝坡单薄且在水下,不能观测检查,加之每年水库运行水位低于174平台的时间很短,施工期间需降低库水位,影响水库效益,因而放弃了这一布置。
(A) the overall design of impermeable concrete wall impermeable 1. Axis of impervious wall arrangement of the anti-impermeable wall of the axis layout has been studied in the following two forms: (1) arranged in the upper reaches of the 174-meter elevation platform , The following platform using concrete impervious wall structure, the above clay oblique wall. Although this arrangement can reduce the workload of concrete cutoff wall, but due to narrow platform space, construction layout difficulties, the axis of the dam slope is thin and underwater, can not be observed, combined with annual reservoir operating water level below 174 platform is very Short, it is necessary to reduce the reservoir water level during the construction and affect the reservoir efficiency, thus giving up this arrangement.