深圳地区花岗岩球状风化体地下分布规律统计分析  

Statistical analyses of the subsurface occurrence of globular weathered body of granite in Shenzhen

作　　者：曹权[1,2] 项伟[1] 王凤华[1] 郭龙[1] 李清明[2] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]深圳市市政设计研究院有限公司,广东深圳518029

出　　处：《水文地质工程地质》2013年第5期87-90,96,共5页Hydrogeology & Engineering Geology

基　　金：中国博士后科学基金(2012M511706)

摘　　要：深圳花岗岩发育地区球状风化体(俗称孤石)广泛分布,对地下工程建设产生了不利的影响。通过对深圳地区花岗岩孤石大样本的统计分析,得到如下统计结论:深圳地区花岗岩孤石主要成份是微风化花岗岩,60%以上分布在强风化花岗岩层中,残积层和全风化层中也有分布,孤石层面分布高程集中在40.00~70.00m(黄海高程)区间内;80%的孤石揭示"厚度"不超过2.50m,三分之二花岗岩孤石主要发育一层,随着发育层数的增多,出现频率锐减。Globular weathered body of granite( commonly known as 'solitary stone') is widely distributed in the Shenzhen district,which has the adverse impact on underground construction. Using the current basic theoretical research on the distribution of solitary stone,the spatial distribution of the solitary stones can not bequantitatively determined. It is particularly important to establish the statistical discipline of regional solitary stone distribution. Based on large samples of granite solitary stones in the Shenzhen district,statistical conclusions are drawn as the follows. The main ingredients of granite solitary stones in the Shenzhen district is weathered granite. More than 60% of the solitary stones are located in a strong weathered granite layer,and others are located in a completely weathered granite layer and a residual soil layer. The elevation of the upper level of solitary stones is concentrated within the range of 40. 00 to 70. 00 meters( Yellow Sea elevation). The vertical thickness of 80% of the solitary stone does not exceed 2. 50 m,which is revealed by bores. Two-thirds of the granite solitary stones are developed in one layer. With the increase of the number of layers,the frequency of occurrence declines sharply.

关 键 词：花岗岩球状风化体 孤石 分布规律 统计分析 

分 类 号：P588.121[天文地球—岩石学]