| 强度变化对崩坡积体堆积机制及稳定性影响研究 |
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| 引用本文： | 尹小涛,王水林,马双科,刘志文.强度变化对崩坡积体堆积机制及稳定性影响研究[J].岩土力学,2010,31(2):620-626. |
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| 作者姓名： | 尹小涛 王水林 马双科 刘志文 |
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| 作者单位： | 1.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试验室，武汉 430071；2.西安公路研究所，西安 710054； 3.山东省鲁南地质工程勘察院，山东 兖州 272100 |
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| 基金项目： | 冻土工程国家重点实验室开放课题资助，中国科学院知识创新工程重要方向项目 |
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| 摘 要： | 利用颗粒流PFC2D建立了岩土体物理模型，在此基础上设计了均以物理模型折减计算初始模型和以前一折减计算结果为下次折减计算初始模型两类计算条件，每一类又设计了只对凝聚力折减、仅对内摩擦角折减、强度参数同时折减3种计算方案，每种计算方案又包含折减1.0、0.50、0.10、0.01、0.0倍等5个计算工况。经对坡面演替、监测点x方向速度变化曲线等计算结果的对比分析发现：凝聚力对于岩土体的直立特性起控制作用，破坏模式多为崩塌倾倒模式；内摩擦角对于稳定坡角具有重要影响；强度参数同时衰减时，强度参数弱化幅度较大情况下岩土体呈散体物质破坏模式，为滑移渐进破坏模式，其中凝聚力弱化0.1倍前后（约10 kPa）后，破坏模式由崩塌破坏转变为滑移破坏。
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| 关 键 词： | 松散堆积体 颗粒流 抗剪强度 稳定坡角 |
| 收稿时间： | 2009-09-07 |
Study of stability and accumulation mechanism of colluvium affected by change of strength property |
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| YIN Xiao-tao,WANG Shui-lin,MA Shuang-ke,LIU Zhi-wen.Study of stability and accumulation mechanism of colluvium affected by change of strength property[J].Rock and Soil Mechanics,2010,31(2):620-626. |
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| Authors: | YIN Xiao-tao WANG Shui-lin MA Shuang-ke LIU Zhi-wen |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Xi’an Research Institute of Highway, Xi?an 710054, China; 3. Lunan Geologic Engineering Survey Institute;Yanzhou 272100;China |
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| Abstract: | Physical model of rock and soil mass is built by means of particle flow code software. Based on these, two types of initial calculating condition are designed; one is all discounting from physical model, the other is all beginning with the previous discounting computing result. Each type contains three kinds of discounting method, only discounting cohesion, only discounting internal friction angle and discounting shear strength parameter. Furthermore, each kind embraces five types of discounting rates such as 1.00, 0.5, 0.1, 0.01 and 0.0. Then, evolutional map of slope shape and velocity in x direction of monitoring point are compared and analyzed. It is found that the cohesion does good to uprightness of rock and soil mass, whose failure mode is collapsing and toppling; that the internal friction angle plays an important part in stable slope angle. The failure mode changes from collapsing and toppling mode to slipping step by step mode, when strength parameters is discounting 0.1, cohesion being 10 kPa. |
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| Keywords: | loose accumulation body particle flow code shear strength stable slope angle |
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