压力型锚杆支护滑坡的地震动力响应特性研究

李楠; 汪班桥; 门玉明; 张妙芝

doi:10.12090/j.issn.1006-6616.2018.24.04.051

压力型锚杆支护滑坡的地震动力响应特性研究

1.
长安大学地质工程与测绘学院, 陕西西安 710054

2.
陕西铁路工程职业技术学院, 陕西渭南 714000

基金项目:
国家自然科学基金项目（41440021，41572261，41502277）；中央高校基本科研业务费专项资金项目（310826175029，300102268209，310826171016）

详细信息

作者简介: 李楠(1990-), 女, 在读博士, 主要从事滑坡治理及建筑安全研究。E-mail:linan1990111@163.com

通讯作者: 汪班桥(1977-), 女, 博士, 副教授, 主要从事滑坡治理研究。E-mail:dcdgx17@chd.edu.cn

中图分类号: P642.22

收稿日期: 2018-01-09

修回日期: 2018-03-08

STUDY ON DYNAMIC RESPONSE OF LANDSLIDE SUPPORTED BY PRESSURE-TYPE ANCHOR UNDER EARTHQUAKE

1.
School of Geology Engineering and Geomatics, Chang an University, Xi'an 710054, Shaanxi, China

2.
School of Shaan'xi Railway Institute, Weinan 714000, Shaanxi, China

More Information

Corresponding author: Banqiao WANG, dcdgx17@chd.edu.cn

Received Date: 09 January 2018

Revised Date: 08 March 2018

摘要

摘要: 为研究地震作用下锚固滑坡的动力响应特征及压力型锚杆的受力机制，采用ABAQUS有限元软件建立了压力型锚杆联合格构梁支护的锚固滑坡模型，在此基础上，分析了锚固滑坡的加速度响应规律、地震动参数对加速度响应的影响以及压力型锚杆的受力特征等。结果表明：地震作用下锚固滑坡具有明显的高程放大效应，坡顶响应最强；不同类型的地震波作用时，由于其频谱特性的差异，锚固滑坡的加速度响应不同，锚固滑坡对输入地震波的低频段存在放大作用，对高频段具有滤波作用；随地震波幅值的增大，锚固滑坡的加速度响应呈先减小后增大的趋势。对于同一根锚杆而言，锚杆杆体轴力分布较均匀；对于同列不同排的锚杆而言，各排锚杆杆体的轴力值差异较大，自上而下呈"C"型分布，底排锚杆和顶排锚杆承担大部分荷载。研究结果对于压力型锚杆支护滑坡的抗震设计具有一定的指导意义。
- 地震 /
- 锚固滑坡 /
- 压力型锚杆 /
- 动力响应 /
- 数值模拟
Abstract: In order to study dynamic response of anchorage landslide and mechanical behaviors of pressure-type anchor under earthquake, the finite element software ABAQUS was adopted and an anchorage landslide model supported by pressure-type anchor and lattice beam was established. On that basis, the acceleration response law of anchorage landslide, the effect of ground motion parameters on acceleration response of the model, and the mechanical behaviors of pressure-type anchor under earthquake were researched respectively. The results indicated that anchorage landslide had elevation amplification effect from bottom to top along with the landslide, and the acceleration response in crest was the strongest. Due to the spectrum characteristics of earthquake, acceleration response is different under different seismic waves. The anchorage landslide had an amplifying effect on lower frequency band and an attenuation function on higher frequency band. With the increase of loading amplitude, the acceleration response of anchorage landslide decreased first and then increased. For the same anchor, axial force distribution was nearly uniform; however, for the anchors at different elevation, axial force of anchors had a great difference, and the strain distribution of anchor body shows the "C"-type from bottom to top. The bottom anchor and the top anchor bear most of the loads. The research results could provide a reasonable foundation for the design of the pressure-type anchor under earthquake.
- earthquake /
- anchorage landslide /
- pressure-type anchor /
- dynamic response /
- numerical simulation

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图 1 压力型锚杆结构示意图

Figure 1.

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图 2 压力型锚杆联合格构梁支护滑坡

Figure 2.

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图 3 计算模型

Figure 3.

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图 4 输入地震波的加速度时程

Figure 4.

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图 5 坡面测点PGA放大系数

Figure 5.

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图 6 测点加速度傅里叶谱

Figure 6.

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图 7 不同类型地震波作用下坡面测点PGA放大系数

Figure 7.

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图 8 不同幅值地震波作用下边坡测点PGA放大系数

Figure 8.

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图 9 不同时间压缩常数下滑坡测点PGA放大系数

Figure 9.

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图 10 底排锚杆杆体轴力峰值

Figure 10.

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图 11 各排锚杆的平均轴力峰值

Figure 11.

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表 1 锚固滑坡物理力学参数

Table 1. Physical mechanics parameters of anchorage landslide

材料参数	密度/ (kg/m³)	弹性模量/ MPa	泊松比	黏聚力/ KPa	内摩擦角/(°)	阻尼比
土体	2070	450	0.19	35.7	23.5	0.10
格构	2430	2.5×10⁴	0.2	-	-	0.02
杆体	7850	2.1×10⁵	0.3	-	-	0.02
砂浆	1900	1.5×10⁴	0.15	-	-	0.02

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表 2 地震荷载输入工况

Table 2. Information of input seismic waves

工况	地震波类型	幅值/(m/s²)	时间压缩比	持时/s
E-1	El Centro波	0.1g	1	30
E-2	El Centro波	0.2g	1	30
E-3	El Centro波	0.3g	1	30
E-4	El Centro波	0.4g	1	30
E-5	El Centro波	0.6g	1	30
W-1	汶川波	0.3g	1	45
K-1	Kobe波	0.3g	1	25
K-2	Kobe波	0.3g	1.78	14
K-3	Kobe波	0.3g	3.16	7.9

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