深圳湾后海风化深槽的工程地质特征分析  

Engineering Geological Characteristics of Houhai Weathered Deep Trough in Shenzhen Bay Area

作　　者：王贤能 李志波 Wang Xianneng;Li Zhibo(Shenzhen Geokey Group Co.,Ltd.,Shenzhen 518057,Guangdong,China)

机构地区：[1]深圳市工勘岩土集团有限公司,广东深圳518057

出　　处：《岩土工程技术》2023年第2期161-167,共7页Geotechnical Engineering Technique

基　　金：深圳市科创委技术攻关项目(JSGG20180504170317195)。

摘　　要：风化深槽对建筑地基基础工程,尤其是桩基工程,具有很大影响和危害。深圳湾地区发育多处风化深槽,其中后海风化深槽是目前揭露的规模最大的风化深槽,槽底深度175.9 m。通过分析风化深槽的发育规模和工程地质特征,重点探讨了风化深槽内隐伏断裂发育迹象。结果表明,断裂破碎带是形成风化深槽的控制因素,深圳湾地区受北东向五华—深圳断裂带和北西向狮子洋—珠江口断裂带相互交切作用,断裂破碎带宽,断裂力学性质属压扭性兼具张性,利于风化作用向深部扩展;后海风化深槽内全风化岩、强风化岩特别深厚,风化岩强度低。There are many weathered deep troughs in Shenzhen Bay area,among which Houhai weathered deep trough is the largest exposed at present,with a bottom depth of 175.9 m.The existence of weathered deep troughs causes trouble to pile foundation engineering.The development scale and geotechnical engineering characteristics of weathered deep trough were analyzed,and the characteristics of fracture development in weathered deep trough were emphatically discussed.The results show that the fracture zone is the controlling factor for the formation of weathering deep trough.The Shenzhen Bay area is intersected by the northeast Wuhua-Shenzhen fault zone and the northwest Shiziyang-Pearl River Mouth fault zone.The fracture bandwidth and fracture mechanical properties are both compressional and tensional,which are conducive to the propagation of weathering deep.The fully and strongly weathered rock in Houhai weathered deep trough are particularly deep and the strength of weathered rock is low.

关 键 词：后海风化槽 发育规模 工程地质特征 断裂破碎带 

分 类 号：P642[天文地球—工程地质学]