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我县地处浅丘,岩层复杂,页岩分布面积较大,约占全县岩石面积百分之六十左右,加之我县位于川北,交通不便,建池水泥调运及货源极为困难。广大贫下中农在建池实践中采用在页岩地基直接开挖池坑,就地采用石灰,煤渣粉等作水泥代用材料扶筑建池,但由于在页岩地基上扶筑建池技术没有很好解决,不少池子漏水漏气。一九七六年五月“三结合”页岩地基建池技术科研组,对页岩地基建造的沼气池进行了调查研究,总结了群众建池经验,
My county is located in a shallow hill with complex rock formations and a large area of shale distribution, accounting for about 60% of the county’s rock area. In addition, my county is located in the north of Sichuan and the transportation is inconvenient. It is extremely difficult to build and transport the cement to and from the pool. In the practice of building pools, the vast number of underprivileged middle peasants used the excavation of pool pits directly on shale foundations. Lime and coal cinder powders were used as supporting materials for the construction of pools. However, due to the lack of support for building ponds on shale foundations. Good solution, many leaks leaking pool. In May 1976, the “three-in-one” shale foundation pool technology research group conducted investigation and research on the biogas tanks constructed on shale foundations and summarized the experience of the masses to build pools.