摘要
为解决渝东北某山区高速公路三叠系巴东组软岩边坡稳定性问题,基于现场调查、详细勘探和变形监测等方法,分析巴东组斜坡变形孕灾地质背景,从斜坡岩体结构特点、物质组成、力学性质变化、诱发因素等角度揭示巴东组斜坡变形机理和失稳过程,结合工程实际,基于安全和稳定等因素提出“局部清方+抗滑桩支挡+截排水”的加固处治方案。结果表明:1)边坡变形破坏受斜坡体内部地质和外部扰动共同影响,斜坡体各部位位移及速率呈增大—稳定—增大的规律,巴东组岩土体宏观上表现出触变性和灵敏性的双重特性;2)斜坡典型剖面正常工况(天然工况)下整体稳定系数为1.03,处于欠稳定状态;在非正常工况Ⅰ(饱水工况)下稳定系数为0.98,处于不稳定状态;数值计算与现场调查结果基本吻合;3)采用“局部清方+抗滑桩支挡+截排水”的处治措施,具有承载能力强、支挡效果好、对坡体扰动小的优势。针对巴东组地层斜坡变形产生、发展机理和治理措施开展有益探讨,可为山区同类型软岩边坡防灾减灾提供理论指导和技术支撑。
In order to address the stability issues of soft rock slopes of the Triassic Badong Formation in the mountainous expressways of northeastern Chongqing,the geological background of slope deformation hazards was analyzed in the Badong Formation area based on field investigations,detailed explorations,and deformation monitoring,and the deformation mechanism and failure process were revealed through the structural characteristics,material composition,variations in mechanical properties and inducing factors of the slope rock mass.Combined with the actual project,a reinforcement treatment plan of"local excavation+anti-slide pile retention+intercepting and drainage"was proposed to ensure safety and stability.The results indicate that:1)The slope deformation and failure are jointly affected by the internal geology and external disturbances of the slope mass,and the displacement and displacement rate at various parts of the slope follow a pattern of increase-stabilization-increase,and the rock and soil mass of the Badong Formation exhibits the dual characteristics of thixotropy and sensitivity at the macroscale;2)The overall stability coefficient of the typical slope profile under normal working conditions(natural conditions)is 1.03,indicating an unstable state,and under abnormal working condition I(saturated conditions),the stability coefficient is 0.98,also indicating an unstable state.The numerical simulation results of slope stability are basically consistent with those of the field judgments;3)The treatment scheme of"local excavation+anti-slide pile retention+intercepting and drainage"has the advantages of strong bearing capacity,good retention effect and low disturbance to the slope.The discussion on the formation,development and treatment of slope deformation in the Badong Formation provides theoretical guidance and technical support for disaster prevention and mitigation of similar soft rock slopes in mountainous areas in the future.
作者
陈展军
杨喆
周小军
CHEN Zhanjun;YANG Zhe;ZHOU Xiaojun(Guangdong Road&Bridge Construction Development Co.,Ltd.,Guangdong Zhaoqing 526400;China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067)
出处
《公路交通技术》
2026年第1期93-102,共10页
Technology of Highway and Transport
基金
科技部重大研发计划项目(2023YFC300830)
西藏重点研发项目(XZ202502ZY0056-03)。
关键词
巴东组软岩
变形破坏
失稳机制
软弱夹层
防治减灾
highway engineering
Triassic Badong Formation
soft rock slope
anti-slide pile
numerical simulation
disaster prevention and mitigation
