倾倒型黄土崩塌稳定性判据及其影响范围研究

›› 2013, Vol. 34 ›› Issue (S2): 242-246.

倾倒型黄土崩塌稳定性判据及其影响范围研究

叶万军，董西好，杨更社，李晓

西安科技大学建筑与土木工程学院，西安 710054

收稿日期:2013-03-31 出版日期:2013-11-11 发布日期:2013-11-19
作者简介:叶万军，男，1976年生，教授。主要从事边坡工程，土的工程性质及地质灾害防治等方面的研究工作
基金资助:
国家自然科学基金项目（No.41172262）；陕西省青年科技新星项目：(No.KJXX-37)；教育部新世纪人才支持计划项目(No.NCET-12-1044)

Stability criterion and influencing zone of loess collapse with toppling style

YE Wan-jun，DONG Xi-hao，YANG Geng-she，LI Xiao

College of Architecture and Civil Engineering, Xi'an University of Science & Technology, Xi'an 710054, China

Received:2013-03-31 Online:2013-11-11 Published:2013-11-19

摘要/Abstract

摘要： 倾倒型黄土崩塌是黄土地区常见的一种灾害。根据倾倒型黄土崩塌的形成特征，分别由静力平衡条件的临界状态与塑性流动临界状态得到倾倒型崩塌垂直裂隙长度的上、下限解；根据摩尔库仑准则，得到崩塌体底面产状。由以上结果确定倾倒型崩塌体的几何特征；再根据力的平衡、力矩平衡条件，建立倾倒型黄土崩塌的稳定性判据，实现对倾倒型黄土崩塌的稳定性评价。根据发生倾倒变形的条件，建立了倾倒型崩塌体的运动学方程。通过求解，可再现倾倒型黄土崩塌发生后的运动轨迹，确定崩塌体的致灾范围。研究结果揭示了倾倒型崩塌体的形成机制，为确定倾倒式黄土崩塌治理方法及确定建设项目的安全距离的确定提供理论依据。

关键词: 黄土崩塌, 倾倒, 稳定性判据, 影响范围

Abstract: Loess collapse with toppling style is one of the common disasters in loess area. Based on its forming feature, the solutions of upper and lower bound for vertical fracture of the loess collapse are derived in light of the critical state of both static equilibrium and plastic flow. The underside attitude of the collapse is calculated by the Mohr-Coulomb criterion. Thereby the geometric characteristics of the collapse can be determined; then the stability criterion is established based on the balance of force and torque; and the stability evaluation of loess collapse with toppling style is realized. The kinematics equation for loess collapse with topping is built by its toppling deformation conditions. By solving the equation, the trajectory of the loess collapse with toppling style is reconstructed; and the range of the disaster can be detected. The research results reveal the forming mechanism of loess collapse with toppling style, so as to provide a theoretical basis for its governance approaches and its identification with the safe zone of construction project.

Key words: loess collapse, toppling style, stability criterion, influencing zone

中图分类号:

TU 444

叶万军，董西好，杨更社，李晓. 倾倒型黄土崩塌稳定性判据及其影响范围研究[J]. , 2013, 34(S2): 242-246.

YE Wan-jun，DONG Xi-hao，YANG Geng-she，LI Xiao. Stability criterion and influencing zone of loess collapse with toppling style[J]. , 2013, 34(S2): 242-246.

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