土工基础

›› 2019, Vol. 33 ›› Issue (1): 31-34.

• 工程实录 • 上一篇    下一篇

南京秦淮东河黄马青组砂岩工程地质性质研究

张莉萍1，许宝田2，邱德俊1，单泰松2   

  1. （1.南京市水利规划设计院股份有限公司，南京 210022；2.南京大学地球科学与工程学院，南京 210046）
  • 收稿日期:2018-06-07 修回日期:2018-06-13 出版日期:2019-03-02 发布日期:2019-03-08
  • 作者简介:张莉萍（1973-），女，高级工程师，研究方向为工程地质。
  • 基金资助:

    江苏省水利科技项目（2016054），江苏省社会发展面上项目（BE2015675）

Engineering and Geological Characteristics of Qinhuai East River Sandstone of Huangmaqing Formation

ZHANG Liping1, XU Baotian2, QIU Dejun1,  SHAN Taisong2   

  1. (1.Nanjing Water Planning and Designing Institute. Corp. Ltd., Nanjing 210022；
    2.School of Earth Science and Engineering, Nanjing University, Nanjing 210046)
  • Received:2018-06-07 Revised:2018-06-13 Online:2019-03-02 Published:2019-03-08

摘要： 调查和试验发现，南京秦淮东河沿线黄马青组砂岩对新开河道高边坡的稳定性起到关键作用。XRD试验表明，岩石中粘土矿物含量较高，岩石软化性强，吸水后微裂隙逐渐扩展、贯通，导致岩石易发生开裂。根据抗压试验确定该类岩石属于软岩范畴，风化加剧岩石软化性。根据波速确定岩体完整性指数小于根据体积节理数确定完整性指数值。水对岩石的力学性质影响显著，未来河道边坡开挖后应特别关注水对岩石风化和边坡稳定性的影响。

关键词: 秦淮东河, 黄马青组, 砂岩, 工程地质

Abstract: Field reconnaissance and engineering test results indicate that the properties of Qinghuai East River sandstone of Huangmaqing Formation (T2h) are critical to the stability of the proposed high cut rock slopes. The Xray Diffraction (XRD) tests indicates that high clay mineral contents exist in sandstone so that the rock will likely be softened when absorbing the water. Rock mass fractures could also be developed after the water infiltrating and connecting the microcracks. The targeted sandstone was categorized as soft rock by the unconfined compressive strength tests on intact rock samples. When exposed in the ambient atmosphere, the soft rock will be softened. The evaluation results indicate that the rock mass integrity index determined from the shear wave velocity is less than that of determined from the volumetric joint methods. It is also concluded that the water is a critical factor affecting the rock mass properties and the stability issue of the proposed slope excavation should pay attention to the effect of water.

Key words: qinhuaieast river, huangmaqing formation (T2h), sandstone, engineering geology