简谐振动荷载下锚杆加固岩质边坡的受力分析

›› 2012, Vol. 33 ›› Issue (S1): 85-90.

简谐振动荷载下锚杆加固岩质边坡的受力分析

刘建华^{1, 2}，汪优³，付康林⁴，钟昆鸟 ⁴

1. 长沙理工大学道路灾变防治及交通安全教育部工程研究中心，长沙 410004；2. 长沙理工大学交通运输工程学院，长沙 410004； 3. 中南大学土木工程学院，长沙 410075；4. 湖南华罡规划设计研究院有限公司，长沙 410076

收稿日期:2011-08-31 出版日期:2012-09-11 发布日期:2012-09-21
作者简介:刘建华，男，1979年生，博士，副教授，主要从事岩土工程、边坡防护、桩基础方面的工作。
基金资助:
湖南省科技计划重点资助项目(No. 2009JT1021)；长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(No. kfj100303)

Force analysis of anchor bolts reinforcing rock slope under simple harmonic vibration load

LIU Jian-hua^{1, 2}, WANG You³, FU Kang-lin⁴, ZHONG Kun⁴

1.Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education, Changsha University of Science and Technology, Changsha 410004, China; 2. School of Communication and Transportation Engineering; Changsha University of Science and Technology, Changsha 410004, China; 3. School of Civil Engineering, Central South University, Changsha 410075, China; 4. Hunan Huagang Communications Planning & Design Research Institute, Changsha 410076, China

Received:2011-08-31 Online:2012-09-11 Published:2012-09-21

摘要/Abstract

摘要： 基于块体动力学方法，考虑简谐振动地震波作用，根据Pseudo-static分析原理建立动力荷载下的锚杆支护边坡简化模型，采用解析方法对求得谐振作用下沿滑移面滑移的边坡破坏运动解以及锚杆内力解的表达式，在此基础上，提出可适用于抗震设计的锚杆受力解答。通过锚杆支护边坡的参数影响分析表明，地震波的频率对破坏体的滑动位移幅值有较大影响，在锚杆加固边坡设计中应避免免引起共振现象；锚杆间距对位移振动幅值影响也较大，随着间距的增大，位移幅值也增大；当锚杆间距一定时，随着坡高的增大，边坡滑动位移幅值增大幅度相较其他参数影响较小；随着边坡岩石边坡角度的增大，位移幅值也随之增大，下边坡角度从60°增大到90°时，位移幅值由7 cm增大到25 cm；上边坡坡度超过25°时，位移幅度急剧增大，在设计和施工中应当引起重视。

关键词: 边坡, 地震, 锚杆, 简谐振动, 受力分析

Abstract: Based on the block dynamics theory, consider simple harmonic vibration of seismic waves. a simplified model of slope bolting support under dynamic loading was established, according to the analysis principles of Pseudo-static. Then, the solutions of slope failure along the slip plane under resonance effect and the expression of internal forces were obtained by using of analytical methods. Based on these, the mechanical solution of bolt is proposed for seismic design. The parameters analysis of the slope bolting support showed that the frequency of seismic waves has a greater impact on sliding displacement amplitudes of damage body. Thus, the resonance phenomenon should be avoided in slope design. Moreover, the bolt spacing has also a greater impact on vibration amplitude of the displacement. As the spacing increases, the displacement amplitude also increases. When bolt spacing is constant, the slope slip displacement increased amplitude is significantly less than other influence parameters with the slope height increasing. With the rock slope angle increases, the displacement amplitude also increased and the bottom slope angle increases from 60° to 90°, the displacement amplitude increases from 7 cm to 25 cm. While the upper slope angle exceeds 25°, the displacement amplitude increases so rapidly that it should be paid enough attention in the design and construction.

Key words: slope, earthquake, anchor simple bolt, harmonic vibration, force analysis

中图分类号:

TU 457

刘建华，汪优，付康林，钟昆鸟 . 简谐振动荷载下锚杆加固岩质边坡的受力分析[J]. , 2012, 33(S1): 85-90.

LIU Jian-hua , WANG You , FU Kang-lin , ZHONG Kun . Force analysis of anchor bolts reinforcing rock slope under simple harmonic vibration load[J]. , 2012, 33(S1): 85-90.

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