A. 当生石灰用量超过30%时，石灰桩的强度较大
B. 一般采用生石灰与掺和料的体积比为1：1或1：2
C. 石灰桩空口高度不宜小于500mm，这是因为要保持一定的覆盖压力，防止石灰桩膨胀时上鼓
D. 计算石灰桩面积时，桩径可取单孔平均成孔直径
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