三峡工程永久船闸高边坡岩体卸荷松弛特征研究.docxVIP

文章编号：1000－7598－(2006) 05－0723－07三峡工程永久船闸高边坡岩体卸荷松弛特征研究石安池，徐卫亚，张贵科（河海大学 岩土工程研究所，南京 210098）摘 要：三峡工程永久船闸高边坡岩体卸荷松弛特征明显，采用地质调查、钻孔声波测试、内外部变形监测、现场变形试验、钻孔芯样力学试验、压水试验、孔壁录像、钻孔弹模测试等手段进行综合研究，结果表明，边坡岩体可划分为强、弱、微三 个卸荷带，强、弱卸荷带岩体力学性质有明显弱化，微卸荷岩体力学性质无明显变化。在卸荷带内未产生新的结构面，但卸 荷引起了结构面的进一步扩展和张开。岩体变形是结构面张开和岩块变形的综合反映，主要受开挖卸荷影响，锚索对于限制 结构面张开作用明显。关 键 词：三峡工程；永久船闸；岩石高边坡；卸荷松弛；监测试验；卸荷分带中图分类号：TU 457文献标识码：AStudy on unloading and relaxation characteristics of the rockmass ofpermanent shiplock high rock slope of three gorges projectSHI An-chi, XU Wei-ya, ZHANG Gui-ke(Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China)Abstract: The rock mass of permanent shiplock high rock slope of the Three Gorges Project(TGP) has marked characteristics ofunloading and relaxation. Kinds of methods such as geological investigation, sonic velocity test, monitor of deformation, in-situ test of elasticity modulus of rock mass, test of rock permeability, kinescope in hole, test of elasticity modulus of rock mass in hole, etc., have been applied to studying the characteristics. The study shows that the rock mass of the slope can be divided into three zones, strong-unloading zone, middling-unloading zone and slight-unloading zone. The degeneration of properties of rock mass instrong-unloading zone and middling-unloading zone is notable，while degeneration of properties of slight-unloading rock mass is notobvious. The structure and properties of the rock in unloading zone do not alert obviously; but the unloading causes the growth of the joints’ length and width. The deformation of rock mass of the slope mainly depends on the deformation of joints and elastic deformation of rock block, which is affected by excavation. The reinforcement cables have obvious effect on confining deformation of joints.Key words: TGP; permanent shiplock; high rock slope; unloading and relaxation; monitor and test; division of unloading zones位达 67.6 m。在南北两侧高边坡岩体内，各布置 7层排水洞，排水洞顶板向上布设排水孔，以疏排高 边坡岩体内的地下水