Stability analysis of layered cutting slope soil nailing support structure based on strength reduction method

ZHOU Tai-quan; HUA Yuan

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Stability analysis of layered cutting slope soil nailing support structure based on strength reduction method

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- Stability analysis of layered cutting slope soil nailing support structure based on strength reduction method
- Vol. 29, Issue S1, (2008)
- 作者机构：
  
  江南大学环境与土木工程学院,江苏,无锡,214122
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：15 April 2016，
  
  Published：2008
- 稿件说明：
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ZHOU Tai-quan, HUA Yuan. Stability analysis of layered cutting slope soil nailing support structure based on strength reduction method[J]. 2008, 29(S1).
DOI：

ZHOU Tai-quan, HUA Yuan. Stability analysis of layered cutting slope soil nailing support structure based on strength reduction method[J]. 2008, 29(S1). DOI：

摘要

将非线性有限元分析和极限分析相结合形成强度参数折减有限元法，可以灵活地分析强度不均匀顺层路堑边坡支护结构稳定性问题。将岩体力学理论、非线性有限元分析技术和强度折减系数法相结合，对顺层岩体路堑边坡稳定性进行分析。在对密集假设节理有限元模拟中，假设节理在岩体内连续分布，采用连续介质力学方法建立密集分布节理岩体材料模型。采用强度折减系数法计算岩体结构安全系数，建议采用给定的岩体强度参数计算节理岩质边坡开挖、支护完毕后的内力，再逐渐降低岩体强度参数进行岩体边坡非线性有限元分析，直至岩体边坡达到极限状态，从而求出岩质边坡安全系数。采用该方法对渝怀铁路梅江河右岸DK409+989.4～DK410+020段顺层路堑边坡土钉墙支护结构稳定性进行分析，分析结果表明：采用土钉墙支护后的节理边坡塑安全系数为2.3，支护后的岩质边坡处于稳定状态；土钉墙潜在破裂面为岩体弹性区和塑性区的交界面，与测试得到的各排土钉拉力最大值位置一致。

Abstract

The rock mass structure of jointed rock slope dominates the slope deformation and stability. To assure the safety of the layered rock slope

the analysis method combined the rock mechanics theory

nonlinear finite element analysis and strength reduction factor method is proposed to analyze the stability of the jointed rock slope by using soil nailing structure. In the nonlinear finite element modeling for jointed rock slope with dense joints

assuming the joints distribute evenly in the rock

dense distribution jointed rock material model is established based on continuum mechanics theory. The improved safety factor calculation method for jointed rock slope stability using strength reduction method is proposed. It is suggested to calculate the internal forces of rock slope excavation and after supporting by using given rock mass strength parameters. Then the nonlinear finite element analysis is performed for the constructed rock with the slope rock mass strength parameter decreases gradually. Safty coefficient is obtained till the limit state of rock slope is achieved. The stability of the soil nailing support structure for DK409+989.4~DK410+020 of Yuhuai Railway at right side of Meijiang River is performed by using strength reduction method. The result shows that the safety coefficient of jointed rock slope is 2.3

which indicates that the rock slope is in stable state. The potential failure surface for the soil nailing slope is consistent with the measured maximum tensile stress for the soil nailing

which is also the interface between the elastic zone and the plastic zone.

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