岩石高边坡开挖卸荷松弛准则研究与工程应用

›› 2009, Vol. 30 ›› Issue (S2): 452-456.

岩石高边坡开挖卸荷松弛准则研究与工程应用

冯学敏¹，陈胜宏²，李文纲¹

1.中国水电顾问集团成都勘测设计研究院，成都 610072；2.武汉大学水电学院，武汉 430072

收稿日期:2009-08-18 出版日期:2009-08-10 发布日期:2011-06-21
作者简介:冯学敏，男，1977年生，博士，主要从事水工结构高边坡岩土工程问题研究
基金资助:
中国水电顾问集团重大科研项目——高拱坝坝基岩体流变力学特性与工程稳定性研究

Research on unloading relaxation criterion of high rocky slope excavation and its engineering application

FENG Xue-min¹, CHEN Sheng-hong², LI Wen-gang¹

1.Chengdu Hydroelectric Investigation & Design Institute, CHECC, Chengdu 610072, China; 2.School of Water Resources and Hydropower Wuhan University, Wuhan 430072, China

Received:2009-08-18 Online:2009-08-10 Published:2011-06-21

摘要/Abstract

摘要： 基于对卸荷松弛过程和机制的定性分析，提出了以岩石极限拉应变作为卸荷松弛的判别准则。通过对岩石极限拉应变室内试验资料与其抗拉强度之间关系的分析，并结合小湾工程卸荷松弛分析的成功实践经验，提出了极限拉应变值的取值原则，并明确了岩石边坡开挖后实际拉应变的计算方法。运用三维弹黏塑性加锚节理岩体流变模型，将该准则和计算方法应用于锦屏一级拱坝建基面开挖卸荷松弛的数值分析中，通过与实际开挖揭示和声波测试资料的对比，结果表明分析结果较为合理，为工程建设提供了有益的指导

关键词: 岩石高边坡, 开挖卸荷松弛, 判别准则, 极限拉应变, 锦屏一级拱坝建基面

Abstract: The research advance and existent insufficiency of unloading relaxation in rocky slope excavation are summarized. Based on the qualitative analysis of unloading relaxation process and mechanism, the limit tensile strain of rock is proposed as the criterion of unloading relaxation. The value taking principle of limit tensile strain of rock is put forward by analyzing the relationship between lab test value of limit tensile strain of rock and its tensile strength, and by referring to the successful practice of excavation unloading relaxation analysis in Xiaowan arch dam. The calculation method of tensile strain in rocky slope after excavation is deduced. By adopting three-dimensional elasto-viscoplastic finite element method of reinforced jointed rock masses, this unloading relaxation criterion and corresponding calculation methods are applied to the numerical analysis of rocky slope excavation unloading relaxation in Jinping First-Cascade arch dam foundation plane. By comparing to the disclosed situation after actual excavation and the sonic wave testing data, the results of numerical analysis are confirmed reasonable, so as to provide beneficial guidance to the construction of project.

Key words: high rocky slope, unloading relaxation of excavation, criterion, limit tensile strain, Jinping First-Cascade arch dam foundation plane

中图分类号:

TU 452

冯学敏，陈胜宏，李文纲. 岩石高边坡开挖卸荷松弛准则研究与工程应用[J]. , 2009, 30(S2): 452-456.

FENG Xue-min , CHEN Sheng-hong , LI Wen-gang. Research on unloading relaxation criterion of high rocky slope excavation and its engineering application[J]. , 2009, 30(S2): 452-456.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

本文评价

推荐阅读 10

[1]	孙树林，李方，谌军. 掺石灰黏土电阻率试验研究[J]. , 2010, 31(1): 51 -55 .
[2]	李英勇，张顶立，张宏博，宋修广. 边坡加固中预应力锚索失效机制与失效效应研究[J]. , 2010, 31(1): 144 -150 .
[3]	李晶，缪林昌，钟建驰，冯兆祥. EPS颗粒混合轻质土反复荷载下变形和阻尼特性[J]. , 2010, 31(6): 1769 -1775 .
[4]	梁健伟，房营光，谷任国. 极细颗粒黏土渗流的微电场效应分析[J]. , 2010, 31(10): 3043 -3050 .
[5]	李秀珍，王成华，邓宏艳. DDA法和Fisher判别法在潜在滑坡判识中的应用比较[J]. , 2011, 32(1): 186 -192 .
[6]	吉武军. 黄土隧道工程问题调查分析[J]. , 2009, 30(S2): 387 -390 .
[7]	陈力华，林志，李星平. 公路隧道中系统锚杆的功效研究[J]. , 2011, 32(6): 1843 -1848 .
[8]	陈立文，孙德安. 不同应力路径下水土耦合超固结黏土分叉分析[J]. , 2011, 32(10): 2922 -2928 .
[9]	郑刚张立明刁钰. 开挖条件下坑底工程桩工作性状及沉降计算分析[J]. , 2011, 32(10): 3089 -3096 .
[10]	赵明华，雷勇，张锐. 岩溶区桩基冲切破坏模式及安全厚度研究[J]. , 2012, 33(2): 524 -530 .