土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (2): 327-332.

• 测试技术 • 上一篇    下一篇

花岗岩残积土崩解特性试验研究

周宝贵1，钟华斌1，林楷彦2，杨雪强2，蔡池峰1   

  1. (1.中建安装集团有限公司 ，南京 210000；2.广东工业大学 土木与交通工程学院，广州 510006)
  • 收稿日期:2023-05-12 修回日期:2023-06-07 出版日期:2025-04-30 发布日期:2025-06-03
  • 通讯作者: 杨雪强(1966-)，男，教授，博士，研究方向为岩土本构关系及边坡稳定等。
  • 作者简介:周宝贵(1973-)，男，高级工程师，研究方向为土木工程施工与管理。
  • 基金资助:
    国家自然科学基金项目（51978177）

Experimental Study on Disintegration Characteristics of a Granite Residual Soil

ZHOU Baogui1, ZHONG Huabin1, LIN Kaiyan2, YANG Xueqiang2， CAI Chifeng1   

  1. (1.China Construction Industrial & Energy Engineering Group Co. Ltd., Nanjing 210000；
    2.School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006)
  • Received:2023-05-12 Revised:2023-06-07 Online:2025-04-30 Published:2025-06-03

摘要： 在湿热多雨的福建沿海地区，花岗岩残积土遇水易崩解，导致滑坡等地质灾害发生，对边坡工程、道路工程等造成极大的影响，因此要密切关注其崩解特性及其发生机理。以福建省三明市的花岗岩残积土为研究对象，自行设计一套崩解试验装置，开展了花岗岩残积土在原状土、重塑压实和掺入水泥改良三种条件下的崩解试验，从土体结构及组分的角度探究残积土的崩解破坏机理。结果表明：花岗岩残积土试样崩解过程可以分为3个阶段：表层崩解阶段、结构破坏崩解阶段及胶结物溶解崩解阶段；原状土试样崩解现象明显，崩解速率最快，其次是压实试样，最后是改良试样；花岗岩残积土的崩解速率随时间的变化规律主要呈土体崩解速率呈现先上升，达到峰值，随后减小的趋势；压实及掺加水泥固化剂均可以提升花岗岩残积土的抗崩解性，完全崩解时间可延长到原状土的3～8倍；花岗岩残积土的崩解破坏主要受土体结构、组分及饱和度影响，三者共同作用使得花岗岩残积土具有遇水易崩解的特性。研究结果揭示了花岗岩残积土崩解特性及崩解机理，可为相关工程处理花岗岩残积土提供一定理论依据。

关键词: 边坡工程, 花岗岩残积土, 崩解率, 崩解机理

Abstract: In the humid and rainy coastal areas of Fujian, the granite residual soil is easy to disintegrate in water, resulting in geological hazards such as landslides, which has a great impact on the slope stability and the road engineering. Therefore, it is necessary to pay close attention to its disintegration characteristics and the occurrence mechanism. In this paper, a granite residual soil in Sanming City, Fujian Province is taken as the research object, and a series of the disintegration test devices are designed. The disintegration tests of the granite residual soil samples under three conditions of the undisturbed soil, the remolded compaction and the cement improvement are performed. The disintegration failure mechanism of the residual soil is explored from the perspective of the soil structure and the composition. The results show that the disintegration process of the granite residual soil samples can be divided into three stages: the surface disintegration stage, the structural failure disintegration stage and the cement dissolution disintegration stage. The disintegration phenomenon of the undisturbed soil sample is obvious, and the disintegration rate is the fastest, followed by the compacted sample, and finally improved sample. The variation of the disintegration rate of the granite residual soil with time is mainly that the disintegration rate of the soil increases first, reaches the peak, and then decreases. The compaction and the cement curing agent can improve the disintegration resistance of the granite residual soil, and the complete disintegration time can be extended to 3~8 times of undisturbed soil. The disintegration failure of the granite residual soil is mainly affected by soil structure, the composition, and the saturation. The combination of the three factors makes the granite residual soil have the characteristics of easy disintegration in water. The research results reveal the disintegration characteristics and the disintegration mechanism of the granite residual soil, which can provide a theoretical basis for the treatment of the granite residual soil in related projects.

Key words: Slope Engineering, Granite Residual Soil, Disintegration Rate, Disintegration Mechanism

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