黄土地区高边坡锚索预应力损失与土体蠕变耦合模型研究

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (4): 142-148.

黄土地区高边坡锚索预应力损失与土体蠕变耦合模型研究

万年青^*1, 丁映霞², 丁亚飞³, 侯喜楠⁴, 朱彦鹏⁴

1.甘肃省建设投资(控股)集团有限公司, 甘肃兰州 730050;
2.兰州市城关区市政工程管理所, 甘肃兰州 730030;
3.甘肃第六建设集团股份有限公司, 甘肃兰州 730050;
4.兰州理工大学土木工程学院, 甘肃兰州 730050

收稿日期:2020-05-08 出版日期:2021-08-01 发布日期:2021-09-07
通讯作者: 万年青(1980-),男,甘肃靖远人,高级工程师.Email:1452967157@163.com
基金资助:
甘肃省住建厅科技计划项目(JKR2019-07)

Study on coupling model of prestress loss of anchor cable and soil creep of high slope in loess area

WAN Nian-qing¹, DING Ying-xia², DING Ya-fei³, HOU Xi-nan⁴, ZHU Yan-peng⁴

1. Gansu Construction Investment (Holding) Group Co., Ltd., Lanzhou 730050, China;
2. Municipal Engineering Management Office of Chengguan District, Lanzhou City, Lanzhou 730030, China;
3. Gansu Sixth Construction Group Co., Ltd., Lanzhou 730050, China;
4. College of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2020-05-08 Online:2021-08-01 Published:2021-09-07

摘要/Abstract

摘要： 预应力锚索锚固技术由于能有效控制边坡变形而得到广泛应用,但同时也出现大量因锚固力损失而造成工程失效的问题.建立以M-2K模型为基础,适用于黄土的锚索与边坡蠕变耦合的M-B-B模型,并推导其相应的本构方程、松弛方程和蠕变方程,从理论上解决了锚固力变化与坡体蠕变之间的关系问题.以兰州市城关区某不稳定斜坡治理工程为例,采用遗传算法反算出模型土体蠕变参数,与已有M-K-B模型拟合情况进行对比.结果表明:M-B-B模型更适用于黄土地区的高边坡,可以用来长期预测预应力变化;由于该工程部分为填土,填土部分水平变形较大,使得在预应力损失稳定阶段之前存在预应力缓慢上升阶段,而M-B-B模型则能完美契合该变化;其研究成果可供锚固工程的设计、施工和安全运行参考.

关键词: 黄土地区, 蠕变耦合, 预应力损失, 水平变形, 锚固工程

Abstract: The prestressed anchor cable anchoring technology is widely used because it can effectively control the slope deformation, but at the same time, there are also a lot of engineering failure problems caused by the loss of anchoring force. Based on M-2K model, this model is established, which is suitable for M-B-B model for creep coupling of anchor cable and slope in Loess. Meanwhile, the corresponding constitutive equation, relaxation equation and creep equation are derived, which theoretically solves the relationship between the change of anchorage force and slope creep. Taking an unstable slope treatment project in Chengguan District of Lanzhou City as an example, the genetic algorithm is adopted, which can reversely calculate the creep parameters of the model soil. The results are compared with the existing M-K-B model. The results show that the M-B-B model is more suitable for high slope in loess area, and it can be used to predict the change of prestress in the long run. The project is divided into filling soil, which leads to large horizontal deformation of filling soil. There is a slow rise stage of prestress before the stable stage of prestress loss, and the M-B-B model can perfectly fit this change. The research results can be used as reference for the design, construction and safe operation of anchorage engineering.

Key words: loess area, creep coupling, prestress loss, horizontal deformation, anchor technology

中图分类号:

TU757

万年青, 丁映霞, 丁亚飞, 侯喜楠, 朱彦鹏. 黄土地区高边坡锚索预应力损失与土体蠕变耦合模型研究[J]. 兰州理工大学学报, 2021, 47(4): 142-148.

WAN Nian-qing, DING Ying-xia, DING Ya-fei, HOU Xi-nan, ZHU Yan-peng. Study on coupling model of prestress loss of anchor cable and soil creep of high slope in loess area[J]. Journal of Lanzhou University of Technology, 2021, 47(4): 142-148.

参考文献

[1] KUMAR R,SHARMA K G,VARADARAJAN A.Post-peak response of some metamorphic rocks of India under high confining pressures [J].International Journal of Rock Mechanics and Mining Sciences,2010,47(8):1357-1362.
[2] CHUNG K.Prediction of pre and post-peak behavior of concrete-filled circular steel tube columns under cyclic loads using fiber element method [J].Thin-Walled Structures,2009,48(2):169-178.
[3] HELENE P,PEREIRA F,CASTRO P.Performance of a 40-year-old concrete bridge with embedded,prestressed galvanized strands [J].Materials Performance,2008,43(10):42-455.
[4] 张成恭,王思敬,李智毅,等.工程地质学概论 [M].北京:地震出版社,2005:6-16.
[5] 周永江,何思明,杨雪莲.预应力锚索的预应力损失机理研究 [J].岩土力学,2006(8):1353-1356.
[6] 丁多文,白世伟,罗国煜.预应力锚索加固岩体的应力损失分析 [J].工程地质学报,1995,3(1):65-69.
[7] 张发明,赵维炳,刘宁,等.预应力锚索锚固荷载的变化规律及预测模型 [J].岩石力学与工程学报,2004(1):39-43.
[8] 朱晗迓,尚岳全,陆锡铭,汪会帮.锚索预应力长期损失与坡体蠕变耦合分析 [J] 岩土工程学报,2005(4):464-467.
[9] 王清标,张聪,王辉,等.预应力锚索锚固力损失与岩土体蠕变耦合效应研究 [J].岩土力学,2014,35(8):2150-2156.
[10] 陈拓,陈国庆,黄润秋,等.考虑高边坡强卸荷的锚索锚固力耦合变化模型 [J].岩土力学,2018,39(11):4125-4132.
[11] 张豫川,高飞,吕国顺,等.基于黄土蠕变试验的高填方地基沉降的数值模拟 [J].科学技术与工程,2018,18(30):220-227.
[12] 刘东燕,谢林杰,庹晓峰,等.不同围压作用下砂岩蠕变特性及非线性黏弹塑性模型研究 [J].岩石力学与工程学报,2017,36(增刊2):3705-3712.
[13] 朱才辉,李宁,刘俊平.压实Q3马兰黄土蠕变规律研究 [J].西安理工大学学报,2011,27(4):392-399.
[14] 李双一,王艳琴,张一玉.浅谈后张法预应力施工过程中的应力损失分析及控制 [J].辽宁交通科技,2005(9):52-56.
[15] 王清标.孔道成孔工艺对锚固力损失的分析与控制 [J].山东大学学报(工学版),2009,39(4):145-148.