现行规范要求按单一因素岩体风化分带来选择建基面，在复杂地质条件下规范的这一选择标准显的过于简单。

The current code demand to select dam foundation rock by the single factor-weathering zoning of rock mass, the selected standard of the code shows too simple in complicated geological conditions.

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选择和使用合适的示踪指标，是揭示岩溶地区红色风化壳物质来源的关键。

To select and adopt the proper tracing index is the key to constrain the origin of red weathering crusts in karst areas.

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提高绳索取心钻进效率要做到：一是根据孔深、钻孔孔径、钻孔所遇地层及其岩性的完整程度、构造特点、风化带发育深度等选择套管的直径及下入深度；

To raise wire-line drilling efficiency need to: 1. Select casing diameter and depth according to drilling depth, diameter, strata drilled and rock integrity, structure features, weathered layer depth;

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