Soft and clay Sand and gravel up to very dense Weak rock
硬塑粘土，砂岩致密卵砾石层强风化岩土和复杂地层
Dense rock like quartz cannot hold much liquid so its resistivity will be high.
质地致密的石头很难保持水份, 因而电阻率很高。
Application of Drilling Blasting around Dense Empty Holes in the Tunnel Excavation of Soft Mother Rock
周边密空孔钻爆法在软质围岩隧洞开挖中的应用
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