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[1]曹林祥,刘昕,汪兵,等.强降雨条件下不同级配软岩填筑路基边坡力学响应及稳定性分析研究*[J].中国安全生产科学技术,2026,22(5):110-117.[doi:10.11731/j.issn.1673-193x.2026.05.013]
　Cao Linxiang,Liu Xin,Wang Bing,et al.Mechanical response and stability analysis of soft rock-filled subgrade slopes with different gradations under heavy rainfall conditions[J].Journal of Safety Science and Technology,2026,22(5):110-117.[doi:10.11731/j.issn.1673-193x.2026.05.013]
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强降雨条件下不同级配软岩填筑路基边坡力学响应及稳定性分析研究*

《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
22
期数:
2026年5期
页码:
110-117
栏目:
安全工程技术
出版日期:
2026-05-30

文章信息/Info

Title:
Mechanical response and stability analysis of soft rock-filled subgrade slopes with different gradations under heavy rainfall conditions
文章编号:
1673-193X(2026)-05-0110-08
作者:
曹林祥; 刘昕; 汪兵; 周兴涛; 韩昭阳; 王虎
(1.中交第二航务工程局有限公司，湖北 武汉 430040；
2.湖北文理学院 土木工程与建筑学院，湖北 襄阳 441053)
Author(s):
Cao Linxiang;  Liu Xin;  Wang Bing;  Zhou Xingtao;  Han Zhaoyang;  Wang Hu
(1.CCCC Second Harbor Engineering Co.,Ltd.,Wuhan Hubei 430040,China;
2.School of Civil Engineering and Architecture,Hubei University of Arts and Science,Xiangyang Hubei 441053,China)
关键词:
软岩路基; 填料级配; 强降雨; 渗流-力学耦合; 边坡稳定性
Keywords:
soft rock-filled subgrade;  filler gradation;  heavy rainfall;  seepage-mechanical coupling;  slope stability
分类号:
X936
DOI:
10.11731/j.issn.1673-193x.2026.05.013
文献标志码:
A
摘要:
为解决传统的路基边坡稳定性分析方法中未全面考虑填料级配特征对渗流场和力学响应影响的问题，揭示强降雨条件下不同级配软岩填筑路基的渗流-力学耦合机制以及稳定性演化规律，采用非饱和渗流理论与摩尔-库伦强度准则，引入不均匀系数Cu与曲率系数Cc作为结构性变量，构建考虑级配效应的新等效渗透系数模型与水敏强度退化模型；结合Bishop条分法，建立级配-孔压-稳定性统一计算框架，研究并对比分析细、连续、粗3种典型级配工况下的边坡力学响应差异。研究结果表明：填料级配是控制坡体内部孔隙水压力累积的重要控制因素，在相同的降雨条件下，粗级配工况的孔隙水压力相比于细级配出现显著提升，增幅可达77%，软岩强度参数随着孔压的升高出现指数型衰减，黏聚力与内摩擦角的衰减幅度分别可达24%与17%，且衰减速率受级配结构的显著影响，不同级配条件下边坡安全系数演化路径存在明显差异，最大差值可以达到0.25，呈现出从“缓变累积型”到“突变失稳型”的不同破坏模式，实现了对软岩路基边坡级配效应的定量化评价。研究结果可为强降雨地区公路路基的填料优化设计与灾害防控提供参考。
Abstract:
In order to address the issue that conventional subgrade slope stability analysis methods fail to comprehensively account for the influence of filler gradation characteristics on the seepage field and mechanical response,this paper aims to reveal the seepage-mechanical coupling mechanism and stability evolution law of subgrades filled with soft rock of different gradations under heavy rainfall conditions.Adopting the unsaturated seepage theory and the Mohr-coulomb strength criterion,this study introduces the non-uniformity coefficient Cu and Cc curvature coefficient as structural variables,and establishes a novel equivalent permeability coefficient model and a water-sensitive strength degradation model considering the gradation effect.Integrated with the Bishop slice method,a unified computational framework for gradation-pore water pressure-stability is constructed to investigate and compare the mechanical response discrepancies of slopes under three typical gradation conditions:fine-grained,continuously graded,and coarse-grained fillers.The results demonstrate that filler gradation acts as a critical controlling factor governing the accumulation of pore water pressure within the slope.Under identical rainfall conditions,the pore water pressure in the coarse-grained gradation scenario increases significantly by up to 77% compared with the fine-grained one.The soft rock strength parameters decay exponentially with the rise of pore water pressure,with the cohesion and internal friction angle decreasing by a maximum of 24% and 17% respectively,and the degradation rate is remarkably affected by the gradation structure.Distinct evolution paths of slope safety factors are observed under different gradation conditions,with a maximum difference of 0.25,manifesting various failure modes ranging from a “gradual accumulation type” to a “catastrophic instability type”,which achieves the quantitative evaluation of the gradation effect on soft rock subgrade slopes.The research provide a reference for the filler optimization design and disaster prevention and control of highway subgrades in heavy rainfall regions.

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备注/Memo

备注/Memo:
收稿日期： 2026-02-06；修回日期：2026-03-05；网络首发日期： 2026-05-08
* 基金项目： 湖北省自然科学基金一般面上项目（2025AFB888）
作者简介： 曹林祥，本科，高级工程师，主要研究方向为隧道与地下工程施工。
通信作者： 周兴涛，博士，副教授，主要研究方向为隧道与地下工程。
更新日期/Last Update: 2026-06-03