摘要
依托某海底隧道风化花岗岩,分别进行岩石的基本物理性质、矿物成分、微观结构、元素放射性、耐磨性及力学性质试验,系统分析风化花岗岩的相关物理力学性质参数指标。研究表明:该风化花岗岩主要呈中-微风化,岩石密度2.6 g/cm^(3);主要矿物成分为黑云母和角闪石,以及各种长石类矿物,少量副矿物参杂其中;全-强风化花岗岩主要成分为高岭石、伊利石等黏土矿物,均由原岩矿物风化而成;测区职业照射年有效剂量当量2.71 mSv/年,小于5 mSv/年,属于无放射性危害非限制区;岩石摩擦性指数为3.96,具有较高-极高摩擦性;岩石单轴抗压强度天然值123.70 MPa,饱和值108.85,软化程度0.84,弹性纵波波速4579 m/s,弹性模量54.967 GPa,泊松比0.235。
Based on the weathered granite of a submarine tunnel,the basic physical properties,mineral composition,microstructure,element radioactivity,wear resistance and mechanical property test of the rock are carried out,and the related physical and mechanical property indexes of weathered granite are systematically analyzed.The research shows that the weathered granite is mainly moderately to slightly weathered,with a rock density of 2.6 g/cm^(3);the main mineral components are biotite and amphibole,as well as various feldspar minerals and a small amount of accessory minerals;the main components of fully to strongly weathered granite are clay minerals such as kaolinite and illite,all of which are weathered from original rock minerals;the annual effective dose equivalent of occupational exposure in this survey area is 2.71 mSv/year,less than 5 mSv/year,belonging to the non-restricted area without radioactive hazards;the rock friction index is 3.96,with high to extremely high friction;the natural value of the uniaxial compressive strength of the rock is 123.70 MPa,with the saturation value of 108.85,the softening degree of 0.84,the elastic modulus of 54.967 GPa,and the Poisson's ratio of 0.235.
作者
张成杰
张小剑
ZHANG Chengjie;ZHANG Xiaojian(Guangdong Geology Prospection Institute,Guangzhou 510080,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China)
出处
《路基工程》
2023年第3期127-131,共5页
Subgrade Engineering
关键词
海底隧道
风化花岗岩
岩矿鉴定
物理力学特性
设计施工建议
submarine tunnel
weathered granite
rock-mineral identification
physical and mechanical properties
design and construction suggestions
