交河故城崖体拉裂-倾倒破坏模式

›› 2012, Vol. 33 ›› Issue (S1): 170-174.

交河故城崖体拉裂-倾倒破坏模式

袁炳祥^{1, 2}，谌文武^{2, 3}，滕军¹，陈锐¹

1. 哈尔滨工业大学深圳研究生院，广东深圳 518055；2. 兰州大学西部灾害与环境力学教育部重点实验室，兰州 730000； 3. 兰州大学土木工程与力学学院，兰州 730000

收稿日期:2012-05-11 出版日期:2012-09-11 发布日期:2012-09-21
作者简介:袁炳祥，男，1983年生，博士，主要从事地质工程、岩土工程、文物保护和颗粒流研究
基金资助:
国家科技部十一五科技支撑计划项目“土遗址保护关键技术研究”资助（No. 2006BAK30B02）

Mechanism research on fracturing-toppling pattern of cliff body in Jiaohe Ruins

YUAN Bing-xiang^{1, 2}, CHEN Wen-wu^{2, 3}, TENG Jun ¹, CHEN Rui¹

1. Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China; 2. Key Laboratory of Mechanics on Disaster and Environment in Western China of Education Ministry, Lanzhou University, Lanzhou 730000, China; 3. College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China

Received:2012-05-11 Online:2012-09-11 Published:2012-09-21

摘要/Abstract

摘要： 交河故城崖体差异风蚀和次生卸荷裂隙发育部位破坏严重，研究二者对崖体破坏的影响以及在其影响下的破坏模式，对加固崖体和保护交河故城具有重要意义，运用有限元软件ANSYS对崖体在差异风蚀和次生卸荷裂隙作用下进行数值模拟。为验证有限元软件模拟结果的可靠性，采用底面摩擦试验对崖体破坏演变过程进行模拟。ANSYS模拟结果表明，被裂隙切割土体最大位移为487.326 mm，崖体卸荷裂隙根部塑性应变最大，崖体拉裂-倾倒破坏。底面摩擦试验结果表明，经过2.7 h崖体顶部的裂隙张开度约20 mm，土体已经倾倒破坏。土体拉裂-倾倒破坏模式为：被卸荷裂隙切割的粉质黏土层底部临空，在重力作用下拉张卸荷裂隙的根部被切割，土体将发生倾斜变形，可能拉断卸荷裂隙的根部而使土体倾倒失稳。针对差异风蚀和次生卸荷裂隙对崖体破坏的影响，提出崖体加固方案。

关键词: 次生卸荷裂隙, 差异风蚀, 拉裂-倾倒, 底面摩擦试验, ANSYS软件

Abstract: The cliff body has been severely damaged by diverse wind erosion and secondary relaxed fissures of cliff bodies in the Jiaohe Ruins. It is important to study the influence of diverse wind erosion and secondary relaxed fissures on cliff bodies and damaged pattern under both of them. The finite element software ANSYS is used to simulate cliff body damage under diverse wind erosion and secondary relaxed fissures. In order to verify the result of finite element software simulation, the basal contact friction test is carried out to simulate the cliff body damage process. The result of finite element software simulation illuminates that the maximum displacement of the cliff body is 487.326 mm, the maximum plastic strain is at the root of the relaxed fissure, and the cliff body is fracturing and toppling. The result of the basal contact friction test shows that the open width of the fissure is 20 mm after 2.7 h, and then the soil body is falling. The fracturing-toppling progress is that the bottom of silty clay layer incised by secondary relaxed fissure is empty; the root of relaxed fissure is pulled apart; the incised soil body is inclined deformation; and then the root would appear tensile failure and the soil body would topple and fall. For the impacts of diverse wind erosion and secondary relaxed fissures on damage of cliff bodies, the reinforcement program of cliff bodies is brought forward.

Key words: secondary relaxed fissures, diversity of wind erosion, fracturing-toppling pattern, basal contact friction test, ANSYS

中图分类号:

TU 443

袁炳祥，谌文武，滕军，陈锐 . 交河故城崖体拉裂-倾倒破坏模式[J]. , 2012, 33(S1): 170-174.

YUAN Bing-xiang , CHEN Wen-wu , TENG Jun , CHEN Rui . Mechanism research on fracturing-toppling pattern of cliff body in Jiaohe Ruins[J]. , 2012, 33(S1): 170-174.

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