厦门岛花岗岩球状风化体分布规律统计分析

The Statistical Analysis of the Distributions of Spheroidal Weathering Granite Boulders in Xiamen Island

厦门岛花岗岩分布广泛,花岗岩球状风化体(俗称孤石)问题十分突出。文章基于某地铁(厦门市轨道交通1号线一期工程和厦门市轨道交通2号线一期工程),对地铁沿线孤石样本进行统计分析,得到如下结论:厦门地铁沿线各车站区间内孤石发育率各不相同,孤石风化程度以中风化为主,主要分布在强风化层中,孤石竖向分布近似服从正态分布,孤石中心高程主要分布在-35m^15m(黄海高程)区间内,孤石厚度集中在0m^4m范围内。

Granites are widely distributed on Xiamen islands. The problems caused by spheroidal weathering granite bodies, commonly known as the boulders, are very prominent. Based on the subways, Xiamen No. 1 subway line And Xiamen No. 2 subway line, the statistical analysis for boulder samples is made, the conclusions are as follows： along Xiamen Metro lines the growth rates of boulders vary from different interval tunnels. The boulder weathering level is intermediary weathered, mainly distributed on strong weathered layer. The vertical distribution of the boulder obeys the Gaussian distribution. The boulder central elevations are mainly distributed from -35m to 15m. The thicknesses of boulders are from 0m to 4m.