首页|裂隙水作用下岩质边坡平面滑动力学模型

裂隙水作用下岩质边坡平面滑动力学模型

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在降雨等水力条件作用下沿岩层层面的平面滑动是顺层岩质边坡最常见的一种破坏模式,而目前关于该类边坡的稳定性计算方法几乎很少考虑裂隙面粗糙度对地下水渗流力及滑面抗剪强度的影响,进而导致其稳定性计算结果误差较大.为此,首先对地下水作用下的顺层岩质边坡受力特征进行分析,认为地下水将对滑动岩体产生 3 个方面的力学作用:张裂隙中的静水压力、滑面上的扬压力和渗流力,由此建立了相应的边坡稳定性计算模型.其次,通过引入裂隙面粗糙度对裂隙抗剪强度及地下水渗流力的影响,提出了考虑裂隙粗糙及地下水渗流力的顺层岩质边坡稳定性计算模型.而后,通过对含一条贯通粗糙裂隙的岩质边坡稳定性为例,验证了该模型计算结果的合理性,同时计算结果表明裂隙面粗糙度系数JRC对边坡稳定性有重要影响,必须予以考虑.最后,基于参数敏感性分析研究了主要参数如裂隙面粗糙度系数、裂隙基本摩擦角、裂隙宽度、裂隙壁面岩石抗压强度及地下水位高度等对边坡稳定性的影响,结果表明:仅裂隙宽度对边坡稳定性影响很小,而其他参数对边坡稳定性影响则相对较大,不容忽视.且裂隙面粗糙度对边坡稳定性的影响与裂隙壁面岩石抗压强度密切相关,随着其增加,裂隙面粗糙度对边坡稳定性的影响程度逐渐变大.
A Planar Sliding Mechanical Model for Rock Slope by Crack Water
Planar sliding along rock layer is the most common failure mode of the consequent rock slope under hydraulic conditions such as rainfall,however,the current stability calculation methods for this kind of slope rarely consider the influence of crack roughness on groundwater seepage force and shear strength of the sliding face,which lead to a large error in the stability calculation results.Therefore,the mechanical characteristics of the consequent slope by the groundwater are firstly analyzed.It is considered that the groundwater produces 3 mechanical effects on the sliding rock mass,e.g.hydrostatic pressure in the tensile crack,uplift pressure on the sliding face and seepage force.Therefore,the corresponding calculation model for the slope stability is established.Secondly,by introducing the influence of crack roughness on crack shear strength and groundwater seepage force,a calculation model for the consequent slope stability considering crack roughness and groundwater seepage force is proposed.Then,taking the stability of the rock slope with a passing through rough crack for an example,the rationality of the calculation result from the proposed model is verified.The calculation result shows that the crack surface joint roughness coefficient(JRC)plays an important role in the slope stability,which must be taken into consideration.Finally,based on the parameter sensitivity analysis,the influences of the main parameters such as crack surface roughness coefficient,crack basic friction angle,crack width,crack wall rock compressive strength and groundwater level height on the slope stability are studied.The result shows that the crack width has little influence on the slope stability,while the other parameters have relatively larger influence and cannot be ignored.Meanwhile,the effect of crack surface roughness coefficient on the slope stability is much related to crack wall rock compressive strength,and the effect degree of crack surface roughness coefficient on the slope stability gradually becomes lager with increasing crack wall rock compressive strength.

road engineeringrock slopeplanar slidingmechanical modelcrack waterrough crackcrack shear strength criterion

姜楠、张安然、张芳、陈明晖、曹晓伟

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黄河水利职业技术学院,河南 开封 475004

河南省跨流域区域引调水运行与生态安全工程研究中心,河南 开封 475004

中国建筑第八工程局有限公司华北分公司,天津 300450

昊鼎地基基础工程有限公司,河南 郑州 450008

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道路工程 岩质边坡 平面滑动 力学模型 裂隙水 粗糙裂隙 裂隙抗剪强度准则

国家级职业教育教师教学创新团队课题研究项目开封市重点研发项目河南省自然科学基金河南省自然科学基金开封市哲学社会科学规划调研课题

ZH202104010122ZDYF007222300420237232300420105ZXSKGH-2023-0178

2024

10.3969/j.issn.1002-0268.2024.02.009

公路交通科技
交通运输部公路科学研究院

公路交通科技

CSTPCD北大核心
影响因子：1.007
ISSN：1002-0268
年,卷(期)：2024.41(2)
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