| 强风化软硬互层岩质高边坡监测与数值模拟 |
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| 引用本文： | 周勇,王旭日,朱彦鹏,李京榜,蒋小奎. 强风化软硬互层岩质高边坡监测与数值模拟[J]. 岩土力学, 2018, 39(6): 2249-2258. DOI: 10.16285/j.rsm.2016.2026 |
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| 作者姓名： | 周勇 王旭日 朱彦鹏 李京榜 蒋小奎 |
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| 作者单位： | 1. 兰州理工大学 甘肃省土木工程防灾减灾重点实验室，甘肃 兰州 730050； 2. 兰州理工大学 西部土木工程防灾减灾教育部工程研究中心，甘肃 兰州 730050；3. 甘肃长达路业有限责任公司，甘肃 兰州 730030 |
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| 基金项目： | 国家自然科学基金（No.51568042）；教育部长江学者和创新团队发展计划（No.2013IRT13068） |
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| 摘 要： | 强风化软硬互层岩质高边坡属岩质边坡特殊情况，其结构面组成及性质复杂，与支护结构相互作用的复杂程度较高，相互影响较大，顺倾结构面临空等情况下破坏可能性很大。以兰永一级公路某深挖路堑边坡的治理工程为依托，对边坡支护过程中及支护结束后的锚杆应力、锚索内力、坡体位移进行了原位监测，并利用岩土分析软件PLAXIS，采用节理岩模块对该边坡工程进行了数值模拟分析。监测及模拟结果表明：该边坡由节理裂隙与岩层面形成折线形潜在滑面，且具有相同滑动可能性的潜在滑面不止一个；支护结构穿透组成滑面折线的任何折线段部分均对结构面稳定有显著影响，但支护结构穿透泥岩面对结构面的影响较穿透节理裂隙更大；支护锚索预应力变化具有一定规律，预应力变化过程对坡体位移及支护结构内力具有一定影响；坡体的主动变形对支护结构内力的影响较坡体被动变形大，结构面产生滑动趋势对坡面位移影响的敏感程度较支护结构内力影响的敏感程度低。该边坡支护稳定，支护设计合理，可为同类边坡支护设计提供相应建议。
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| 关 键 词： | 互层岩质边坡 潜在滑面 坡体位移 监测 锚杆应力 锚索锚固力 |
| 收稿时间： | 2016-08-25 |
Monitoring and numerical simulation of an interbedding high slope composed of soft and hard strong-weathered rock |
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| ZHOU Yong,WANG Xu-ri,ZHU Yan-peng,LI Jing-bang,JIANG Xiao-kui. Monitoring and numerical simulation of an interbedding high slope composed of soft and hard strong-weathered rock[J]. Rock and Soil Mechanics, 2018, 39(6): 2249-2258. DOI: 10.16285/j.rsm.2016.2026 |
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| Authors: | ZHOU Yong WANG Xu-ri ZHU Yan-peng LI Jing-bang JIANG Xiao-kui |
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| Affiliation: | 1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 3. Gansu Changda Highway Co., Ltd., Lanzhou, Gansu 730030, China |
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| Abstract: | The interbedding slope with soft and hard strong-weathered rock is a special high slope, and the composition and properties of its structural surfaces are complex. The complexity and mutual influence of the interaction between the slope and supporting structure are relatively high, and it is the most probable that the collapsible structure will be destroyed when exposed to air. Based on the engineering of a deep cutting slope of Lanyong highway, we conducted in-situ monitoring the anchor rod stress, inner anchor force, and the displacement of the slope during and after the support. Moreover, numerical analysis was performed on the joint rock module of geotechnical engineering using PLAXIS software. The monitoring and numerical results indicate that the potential polygonal sliding surface of rock slope is formed by joint fractures and rock layers, and there is more than one potential sliding surface with the same sliding possibility. The retaining structure has great influence on the stability of structure surface when it penetrates any part of the fold line of the slip surface, but the penetrating shale surface has a greater effect on the structural surface than penetrating fissures. The variation of prestressing force of supporting anchor cable has a certain regularity, and the process of prestressing variation has a certain effect on the displacement of the slope and internal force of retaining supporting structure. For internal forces of supporting structure, the influence of the active deformation of the slope is greater than the influence of passive deformation of the slope. However, for a sensitive degree, sliding effect of the structural surface on the displacement of slope surface is less than the influence of internal forces of supporting structure. The support of the slope is stable, and the supporting design is reasonable, which can provide corresponding advice for the design of similar supporting slopes. |
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| Keywords: | interbedding rock slope potential sliding surface slope-mass slide displacement monitoring anchor bar stress anchoring force of cable bolts |
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