研究目的：研究花岗岩残积土的岩性特性，探讨花岗岩残积土及全风化土实测标贯击数N的概率分布，并计算其服从概率分布的概率密度函数。
研究结论：目前国内外对标贯实测击数进行杆长修正没有一致意见，建议使用实测击数，可使野外编录、判别的操作性更强。通过实测结果来看，锤击数在15≤N<30范围内可定名为残积土，锤击数在30 < N ≤50范围内可定名为全风化土。经统计分析认为，深圳地区花岗岩残积土及全风化土实测标贯击数N的概型分布为正态分布。
Research purposes: This paper researches the rock characteristics of granite residual soil, discusses the probability distribution of measured stand penetration test (SPT) N of granite residual soil and completely rotten soil and fitted their probability density function.
Research conclusions: At present, there is no consistent suggestion about revised SPT, use measured SPT' make field work more .operable. According to measured results, it can be named residual soil that N is ranging from 15 to 30, and N is ranging from 30 to 50 can be named completely rotten soil. The optimum probability distribution of measured SPT of granite residual soil and completely rotten soil in Shenzhen district is normal distribution by statistical analysis.
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