结合南阳地区膨胀土的抗剪强度研究，对其现场剪切试验的试样制备及试验方法进行探讨，提出了膨胀土抗剪强度的修改计算公式。
Taking the expensive soil in Nanyang Area, Henan Province, as study case, the in-situ shear test method, including preparing samples and test method, is proposed in the paper.
南阳盆地是河南省最大的一块盆地，纬度偏南，地形特殊，是全省温度最高地区。
Nanyang Basin is the largest basin in Henan Province. Owing to its special topography, the mean temperature in the Basin is the highest in Henan.
我国膨胀土分布广泛，尤其在南阳地区，膨胀土分布面积占整个南阳盆地的65%。
The distribution of expansive soil in China is very wide, especially in NanYang, expansive soil area occupies 65 percent of the total area.
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