极限分析法求解含软弱夹层边坡稳定性

徐鹏; 尚念林; 鲍晶晶; 李婷

doi:10.3969/j.issn.0258-2724.20200156

极限分析法求解含软弱夹层边坡稳定性

doi: 10.3969/j.issn.0258-2724.20200156

徐鹏^1,,
尚念林²,
鲍晶晶³,
李婷^{1, 4, ,}

1.
石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室，河北石家庄 050043
2.
山东宝泰置业有限公司，山东济南 271100
3.
西南交通大学土木工程学院，四川成都 610031
4.
石家庄铁道大学土木工程学院，河北石家庄 050043

基金项目: 国家自然科学基金(52108331)；河北省自然科学基金(E2021210010)；河北省高等学校科学技术研究项目(ZD2021096，QN2021127)；河北省引进留学人员资助项目（C20210305）

详细信息

作者简介:
徐鹏（1988—），男，讲师，研究方向为道路与铁道工程，E-mail：bk20090201@my.swjtu.edu.cn

通讯作者:
李婷（1992—），女，讲师，研究方向为地基变形控制与路基工程等，E-mail：liting9225@126.com

中图分类号: TU41
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- 文章访问数: 315
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-02
- 修回日期: 2020-09-04
- 刊出日期: 2020-09-16

Stability Analysis of Slopes with Weak Layers Using Limit Analysis Method

XU Peng^1
,,
SHANG Nianlin²,
BAO Jingjing³,
LI Ting^{1, 4
, ,}

1.
State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2.
Shandong Baotai Real Estate Co., Ltd., Jinan 271100, China
3.
School of Civil engineering, Southwest Jiaotong University, Chengdu 610031, China
4.
School of Civil engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

摘要

摘要:
软弱夹层对边坡的稳定性影响显著，目前设计中通常采用极限平衡法计算边坡的稳定性，其在求解中需要建立多个平衡方程. 为了分析含软弱夹层边坡的稳定性，首先，采用极限分析法建立了计算模型；其次，通过极限平衡法验证了求解的准确性；最后，分析了荷载、夹层形状、夹层强度等对稳定性的影响. 研究结果表明：边坡安全系数随着外荷载强度的增大而减小，其中，当加速度放大系数由1.0增大为1.6时，安全系数由1.20降为0.89；当外荷载频率越大时，边坡越易提前产生破坏；软弱夹层形状对边坡安全系数影响显著，特别是当其靠近坡顶与坡面时；安全系数随着软弱夹层摩擦角与黏聚力的减小而近似线性降低，其中，当黏聚力由9 kPa降为5 kPa时，安全系数降低约30%.
- 软弱夹层 /
- 边坡 /
- 极限平衡法 /
- 极限分析法 /
- 安全系数
Abstract:
Weak layers have a significant effect on the stability of slopes. The stability of slopes is usually calculated by the limit equilibrium method in current designs, in which multiple equilibrium equations need to be established and solved. Compared with the limit equilibrium method, the limit analysis method is more rigorous, and requires only one energy equation to be solved. In order to analyze the stability of slopes with weak interlayers, a stability calculation model was established by the limit analysis method, and then the accuracy of the solution was verified by the limit equilibrium method. Finally, the effects of load, weak layer shape, and weak layer strength on stability were analyzed. The results show that the slope safety factor decreases with an increase in the load intensity. When the acceleration amplification factor increases from 1.0 to 1.6 the safety factor decreases from 1.20 to 0.89. With a higher frequency of the external load, the slope is easier to be damaged in advance. Besides, the shape of the weak layer has a significant effect on the slope safety factor, especially when it is close to the top and surface of the slope. The safety factor decreases approximately linearly with the decrease of the friction angle and cohesion of weak layers. When the cohesion strength decreases from 9 kPa to 5 kPa, the safety factor decreases by about 30%.
- weak layer /
- slope /
- limit equilibrium method /
- limit analysis method /
- safety factor

HTML全文

图 1 边坡模型

Figure 1. Slope model

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图 2 速度矢量图

Figure 2. Diagram of velocity vectors

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图 3 力学模型

Figure 3. Mechanical model

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图 4 f_a对F的影响

Figure 4. Effect of f_a on F

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图 5 k_p对F的影响

Figure 5. Effect of k_p on F

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图 6 f对F的影响

Figure 6. Effect of f on F

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图 7 软弱夹层形状对F的影响

Figure 7. Effect of slip zone shapes on F

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图 8 c和F的关系曲线

Figure 8. Ralation curves of c and F

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表 1 计算结果

Table 1. Calculation results

工况	k_P	d₁ /m	d₂ /m	h₁ /m	h₂ /m	γ /（kN•m⁻³）	c /kPa	φ /（^o）	安全系数
工况	k_P	d₁ /m	d₂ /m	h₁ /m	h₂ /m	γ /（kN•m⁻³）	c /kPa	φ /（^o）	本文方法	摩根斯坦-普莱斯法
1	0	11.59	4.95	3.11	4.95	20	6	30	2.02	2.00
2	0.2	11.59	4.95	3.11	4.95	20	6	30	1.35	1.32
3	0.4	11.59	4.95	3.11	4.95	20	6	30	0.99	0.97
4	0.2	11.59	4.95	3.11	4.95	20	6	20	1.05	1.03
5	0.2	9.78	3.54	2.08	3.54	20	6	20	1.22	1.19
注：表中本文方法计算结果为时间 t 内的最小值.

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表 2 计算结果

Table 2. Calculation results

k_P	d₁ /m	d₂ /m	h₁ /m	h₂ /m	γ /（kN•m⁻³）	c /kPa	φ /（^o）	安全系数
k_P	d₁ /m	d₂ /m	h₁ /m	h₂ /m	γ /（kN•m⁻³）	c /kPa	φ /（^o）	本文方法	二楔块法^[16]	有限元
0	53.56	90.18	1.03	30.00	10.2	0	17	1.36	1.35	1.39

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