基于断裂理论的湿陷性黄土劈裂注浆裂纹扩展

doi:10.13229/j.cnki.jdxbgxb201705019

吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (5): 1472-1481.doi: 10.13229/j.cnki.jdxbgxb201705019

基于断裂理论的湿陷性黄土劈裂注浆裂纹扩展

王腾^{1, 2}, 周茗如^{1, 2}, 马连生³, 乔宏霞^{1, 2}

1.兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州 730050;
2.兰州理工大学甘肃省土木工程防灾减灾重点实验室,兰州 730050;
3.兰州理工大学理学院,兰州 730050

收稿日期:2016-06-21 出版日期:2017-09-20 发布日期:2017-09-20
通讯作者: 周茗如(1962-),男,教授,硕士生导师.研究方向:建筑材料及黄土地基优化.E-mail:18919075046@163.com
作者简介:王腾(1986-),男,博士研究生.研究方向:黄土地区复合地基及地基加固.E-mail:wangteng2035@163.com
基金资助:
甘肃省建设科技攻关项目(JK2014-34); 国家自然科学基金项目(11472123,51468039)

Fracture grouting crack growth of collapsible loess based on fracture theory

WANG Teng^{1, 2}, ZHOU Ming-ru^{1, 2}, MA Lian-sheng³, QIAO Hong-xia^{1, 2}

1.Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China;
2.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China;
3. School of Science,Lanzhou University of Technology, Lanzhou 730050, China

Received:2016-06-21 Online:2017-09-20 Published:2017-09-20

摘要/Abstract

摘要： 为深入研究湿陷性黄土地区浆液在土体中的扩散机制,基于断裂力学理论,建立了一种浆液在二维平面中流动扩散的仿真分析方法。该方法对湿陷性黄土地区劈裂注浆过程中裂纹的产生形式、破坏准则的建立以及裂纹扩展的判定方法进行了描述,实现了对裂纹扩展问题及渗流-应力耦合问题的求解。同时,本文利用ABAQUS软件通过建立的裂缝扩展方程,分析了劈裂注浆压力及土体物理力学性质对裂纹扩展长度的影响。研究结果表明:劈裂注浆压力的计算应该重点考虑裂纹扩展长度和土体强度参数的影响;在黄土劈裂注浆过程中无法通过连续加压进行劈裂注浆,应分段加压,确保扩展过程中能量的聚集。最后,通过室内模型试验对裂缝扩展模拟结果进行了验证,得出试验与模型分析结论相近,验证了理论的合理性。

关键词: 土木工程, 湿陷性黄土, 劈裂注浆, 裂纹长度, 断裂力学, 应力耦合, 扩展路径

Abstract: In order to study the diffusion mechanism of grout in soil body collapsible loess area, a simulation analysis method of grout flowing diffusion in 2D surface is proposed based on fracture mechanics theory. The formation pattern of crack was described, the failure criterion and judgment method of the crack growth in fracture grouting were established, the problems of crack growth and coupling of seepage and stress were solved. Meanwhile, by setting up the crack growth equation with ABAQUS software, the fracture grouting pressure and the influence of physico-mechanical properties of soil body on the length of crack growth were analyzed. Results show that, to calculate the facture grouting pressure, crack growth length and the soil body strength parameters must be considered. In loess fracture grouting, fracture grouting can not obtained by continuous pressure, which should replaced by segmented pressure to ensure the aggregation of energy in crack growth process. Laboratory model experiments were carried out and the results are in good agreement with that of model analysis, verifying the proposed simulation analysis method.

Key words: civil engineering, collapsible loess, fracture grouting, crack length, fracture mechanics, stress coupling, expansion path

中图分类号:

TU472.6

王腾, 周茗如, 马连生, 乔宏霞. 基于断裂理论的湿陷性黄土劈裂注浆裂纹扩展[J]. 吉林大学学报(工学版), 2017, 47(5): 1472-1481.

WANG Teng, ZHOU Ming-ru, MA Lian-sheng, QIAO Hong-xia. Fracture grouting crack growth of collapsible loess based on fracture theory[J]. 吉林大学学报(工学版), 2017, 47(5): 1472-1481.

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基于断裂理论的湿陷性黄土劈裂注浆裂纹扩展

Fracture grouting crack growth of collapsible loess based on fracture theory

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