闽东南花岗岩球状风化不良地质发育特征及其工程地质问题  

GRANITE SPHERICAL WEATHERING FEATURES AND RELATED ENGINEERING GEOLOGICAL PROBLEMS IN THE SOUTHEAST AREA OF FUJIAN PROVINCE

作　　者：王浩[1] 刘成禹[1] 陈志波[1] 

机构地区：[1]福州大学环境与资源学院资源与城乡建设系,福州350108

出　　处：《工程地质学报》2011年第4期564-569,共6页Journal of Engineering Geology

基　　金：国家自然科学基金青年基金项目(41002127);福建省青年人才创新基金项目(2008F3060)

摘　　要：闽东南沿海花岗岩广泛出露,其矿物成分差异明显,且受区域地质构造和湿热交替气候影响,花岗岩球状风化不良地质及其诱发的工程地质问题极为突出。粒径大小不一的风化球体受外界环境扰动,形成高空落石或坡面滚石,坚硬的风化球与残积土或全风化岩混杂的斜坡受降雨或开挖触发产生崩塌和滑坡,形成复杂的斜坡地质灾害。富含孤石的花岗岩地段开挖浅埋隧道,由于围岩不均匀引起初期支护局部应力集中,诱发围岩大变形、地表沉降和塌方冒顶等事故。隐伏的孤石易被误认为基岩,并造成桩基工程成孔困难;而裸露的孤石对斜坡地段桩基及墩台构成威胁。Granite is widely distributed in the southeast area of Fujian Province.Granite spherical weathering and the relative engineering geological problems are very prominent because of differences of mineral compositions,regional geologic structure and warm-wet climate in this area.Spherically weathered rock blocks of various sizes fall from the top of slope or roll along slope surface.Collapse and landslide occur because of rainfall or excavation near slopes mixed with weathered spherical rock blocks and residual soil.When tunneling in stratum of spherical weathering,concentration of stresses can occur in the primary support of working face.Then,instability of rock and ground subsidence can appear.Latent spherical weathering rock may be identified as bedrock.It is very difficult to drill for pile foundation.Bare spherical weathered rock can threaten the bridge pi le and abutment on the steep slope.

关 键 词：花岗岩 球状风化 边坡 隧道 基础 

分 类 号：TU75[建筑科学—建筑技术科学]