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跌水沟对深圳某顺层边坡稳定性的影响研究

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针对深圳某顺层边坡在施工期的局部变形破坏问题,通过现场地质调查,并结合勘察与设计资料和现场施工工序及监测数据,分析了边坡局部失稳的主要诱发因素.在此基础上,建立了集岩层层面、跌水沟和支护结构等能反映边坡特征的Phase2数值模型,开展了 4种不同条件下的边坡施工过程分析,研究了边坡局部失稳的诱发机制,研究结果表明:跌水沟是该边坡出现局部变形失稳的主要诱发因素,诱发机制为跌水沟开挖导致岩层层面出现滑动自由面,汇水导致坡脚岩体软化,致使在4级坡体出现顺层面破坏;跌水沟开挖后无汇水时,在无支护结构条件边坡安全系数为1.03,处于欠稳定状态,施加支护后安全系数增加到1.09,基本满足稳定性要求,当出现汇水时,无支护时安全系数为0.85,处于失稳状态,施加支护后安全系数为0.99,处于临滑状态;锚索格构梁能有效防治无汇水时跌水沟诱发的局部边坡失稳,但当出现汇水坡体软化后支护效果欠佳.
Influence of Outfall Ditch on the Stability of a Daylighted Slope in Shenzhen
This paper presents a case history of a local deformation and failure of a daylighted slope in Shenzhen during the con-struction period.The major potential factors triggering the local instability of the slope are analyzed through on-site geological survey,combined with investigation and design data,on-site construction procedures and monitoring data.On this basis,the Phase2 numerical model that can reflect the characteristics of the slope,such as rock stratum,the outfall ditch and the support-ing structure,is established.The slope construction process under four different conditions is analyzed,and the potential trig-gering mechanism of the local instability of the slope is studied.The results show that the outfall ditch is the main inducing fac-tor of the local deformation and instability of the slope.The potential triggering mechanism is that the excavation of the outfall ditch leads to the weak sliding surface at the rock stratum,and the water in the catchment leads to the softening of the rock mass at the foot of the slope,resulting in the failure of the daylighted bedding plane in the fourth-grade slope.When there is no water the catchment after the excavation of the outfall ditch,the safety factor of the slope without support structure is 1.03,which is in an unstable state.After the support is applied,the safety factor increases to 1.09,which basically meets the stabili-ty requirements.When the water in the catchment is presented,the safety factor is 0.85 when there is no support,which is in an unstable state.After the support is applied,the safety factor is 0.99,which is in a critical slip state.The ground anchor with supporting beam can effectively prevent the local slope instability induced by the drop ditch when there is no water in the catchment,but the supporting effect is not good when the water in the catchment slope softens.

Outfall DitchDaylighted SlopeStabilityRock SurfaceNumerical Simulation

唐开中、梁志、李文发、万翼、冷先伦

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深圳能源环保股份有限公司,广东 深圳 518048

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉 430071

中国科学院大学,北京 100049

跌水沟 顺层边坡 稳定性 岩层层面 数值模拟

2024

土工基础
湖北省土木建筑学会,中国科学院武汉岩土力学研究所,武汉市土木建筑学会

土工基础

影响因子:0.238
ISSN:1004-3152
年,卷(期):2024.38(6)