土工基础

›› 2019, Vol. 33 ›› Issue (2): 107-110.

• 工程实录 • 上一篇    下一篇

复杂岩溶地质条件下的基坑支护设计

戚德印1，余 蓓2,肖礼萍1   

  1. (1.中国海诚国际工程投资总院武汉轻工院，武汉 430060；2.湖北城建职业技术学院，武汉 430000)
  • 收稿日期:2018-06-08 修回日期:2018-06-21 出版日期:2019-04-20 发布日期:2019-04-22
  • 作者简介:戚德印（1982-），男，研究生，注册土木（岩土）工程师，研究方向岩土工程勘察与深基坑支护设计。

Support System Design for a Deep Excavation in Karst Terrain of  Complicated Geological Conditions

QI Deyin1, YU Bei2， XIAO Liping1   

  1. （1.China Haisum Engineering Co. Ltd., China Light Industry Wuhan Design and Engineering Co. Ltd., Wuhan 430060；
    2.Hubei Urban Construction Vocational and Technological College, Wuhan 430000）
  • Received:2018-06-08 Revised:2018-06-21 Online:2019-04-20 Published:2019-04-22

摘要： 岩溶广泛分布于我国西南部，由于其“上硬下软”的土层条件及起伏较大的基岩面，对工程建设带来一定的影响。通过对复杂岩溶地质条件的利川市某深基坑支护设计研究，在安全、经济及适用性的基础上采用局部加筋的措施解决了由于岩土物理力学性能差异性过大引起的应力集中问题；对支护桩采用最短桩长和入岩深度双指标控制有效的解决了基岩面起伏较大对基坑稳定性的影响。实践表明，所采用的设计方案取得了良好的效果，为复杂岩溶条件下基坑设计提供了参考和借鉴。

关键词: 基坑, 岩溶, 内支撑, 位移

Abstract: Karst terrain is widely distributed in the southwest of China. Due to its “hard in upper strata and soft in lower strata” soil conditions and large variation in bedrock surface, the karst geology induces negative influences in the engineering projects. In this paper, the supporting system of the deep excavation in the complicated karst geological conditions in Lichuan City is evaluated. To ensure the safety and economy of the project, the additional local reinforcement system in the supporting system was used in resolving the stress concentration issues induced from the significant differences among adjacent soil and rock strata. Both the minimum pile length and the rock socket depth were used in the quality assurance of the soldier pile system. The results were proved to be satisfactory.

Key words: deep excavations, karst terrain, internal support, displacement