Study on unloading and relaxation characteristics of the rockmass of permanent shiplock high rock slope of three gorges project

SHI An-chi; XU Wei-ya; ZHANG Gui-ke

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Study on unloading and relaxation characteristics of the rockmass of permanent shiplock high rock slope of three gorges project

更新时间：2026-06-25

- Study on unloading and relaxation characteristics of the rockmass of permanent shiplock high rock slope of three gorges project
- Vol. 27, Issue 5, (2006)
- 作者机构：
  
  河海大学岩土工程研究所,南京,210098
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU457
- Online First：05 November 2013，
  
  Published：2006
- 稿件说明：
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SHI An-chi, XU Wei-ya, ZHANG Gui-ke. Study on unloading and relaxation characteristics of the rockmass of permanent shiplock high rock slope of three gorges project[J]. 2006, 27(5).
DOI：

SHI An-chi, XU Wei-ya, ZHANG Gui-ke. Study on unloading and relaxation characteristics of the rockmass of permanent shiplock high rock slope of three gorges project[J]. 2006, 27(5). DOI：

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。

Abstract

The rock mass of permanent shiplock high rock slope of the Three Gorges Project(TGP) has marked characteristics of unloading 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 in strong-unloading zone and middling-unloading zone is notable，while degeneration of properties of slight-unloading rock mass is not obvious. 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.

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