The method for making judgment to the optimal tamp number of foundation, which have silt and sand layer as well as have clay, were analyzed.
对既有砂性土又有粘性土地基的点夯最佳夯击击数的确定方法进行了分析；
When the number of fractures was given, the optimal value of the length of fractured horizontal well can be obtained.
对于裂缝条数已知，压裂水平井长度存在一个最优值；
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