A. 当条件允许时，可以采用深基
B. 岩溶塌陷区不宜把土层作为基础持力层，一般多采用桩基
C. 岩溶水的处理宜采取疏导的原则
D. 对已外露的浅埋洞隙，可采用挖填置换、清理洞隙后以碎石或混凝土回填
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