wēi shí ㄨㄟ ㄕㄧˊ 危石 高大的岩石。《庄子·田子方》：“尝与汝登高山，履危石，临百仞之渊，若能射乎？” 明 徐弘祖 《徐霞客游记·粤西游日记二》：“山雨复大至，乃据危石，倚穹崖而坐待之。” 郭沫若 《英雄树下花争放·厓门》诗：“古祠已毁倭夷火，危石犹存 宋 帝踪。”
以任意五面体为例，介绍了危石侧面积、体积的计算方法。
A method is also presented for calculating the side area and volume of critical rocks with arbitrary pentahedron as example.
地下工程中临空面上首先冒落并引发其他岩块冒落或片帮的块体称作“危石”。
The block which will be the first of caving rocks from free surface and lead to more caving or side-fall in underground work is known as "critical rock".
对隐藏于工程围岩内的危石的存在条件及其方位、大小、形状和确定方法进行了讨论。
The paper discusses the existing conditions, location, size, shape and definition method for critical rock hidden in engineering wall rocks.
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