土工基础

›› 2019, Vol. 33 ›› Issue (5): 584-586.

• 工程实录 • 上一篇    下一篇

南京长江第四大桥膨胀岩问题研究

王建国，张 春   

  1. （江苏省水文地质海洋地质勘查院，江苏淮安 223005）
  • 收稿日期:2019-01-24 修回日期:2019-02-27 出版日期:2019-10-20 发布日期:2019-10-22
  • 作者简介:王建国 (1971-)，男，高级工程师，研究方向为工程勘察和地基基础。

Evaluation of Expansive Rock underneath the Nanjing Fourth Yangtze River Crossing Bridge Site

WANG Jianguo, ZHANG Chun   

  1. (Jiangsu Hydrological and Marine Geological Investigation Institute Co. Ltd., Huaian 223005)
  • Received:2019-01-24 Revised:2019-02-27 Online:2019-10-20 Published:2019-10-22

摘要： 膨胀岩石作为特殊性岩体，其分布范围广，其物理力学强度随含水量的变化而变化。膨胀、收缩变形可随环境变化反复发生，导致岩石的强度逐渐衰减，由于各地区膨胀岩的矿物组成、结构和构造、沉积环境、土层埋藏深度、岩体厚度及分布范围等的不同，膨胀岩的性态各异。膨胀岩反复胀缩变形的特性以及杂乱分布的多裂隙结构，会对建筑（构）物造成较严重的破坏。研究膨胀岩石的工程性质，划分其分类，做好其工程地质勘察，为设计与施工提供充分的工程地质资料，是确保工程建设质量的关键。

关键词: 膨胀岩, 南京长江第四大桥, 自由膨胀率, 蒙脱石

Abstract: As a special rock type, the expansive rock is widely distributed in all over the world. The physical and mechanical properties usually change with moisture content. When the expansive rock is developed in between the strength rock layers, the existence of the expansive rock is often ignored and might impose a geo-hazard to the engineering projects. The expansion and contraction in these rock masses change with the adjacent environment and the strength of the rock masses gradually reduce. Due to the difference of mineral composition, structure and sedimental environment, embedment depth and variation of the rock mass thickness, the properties of expansive bedrock are different. The repetitive contraction and expansion characteristics of the expansive rock and their associated fissures are likely result in the damage of building structures above. The study of the engineering properties of expansive rock and their classifications for the engineering purposes are very impotant.

Key words: Expansive Rock, Nanjing Fourth Yangtze River Crossing Bridge, Free Expansion Ratio, Smectite