基于热-水-力-损伤耦合数值模型的高地温水工高压隧洞围岩承载特性

doi:10.16285/j.rsm.2016.0149

›› 2018, Vol. 39 ›› Issue (1): 308-319.doi: 10.16285/j.rsm.2016.0149

基于热-水-力-损伤耦合数值模型的高地温水工高压隧洞围岩承载特性

苏国韶^{1, 2}，秦子华^{1, 2}，彭立锋^{1, 2}，邹亚峰^{1, 2}，胡小川^{1, 2}

1. 广西大学土木建筑工程学院，广西南宁 530004；2. 广西大学工程防灾与结构安全教育部重点实验室，广西南宁 530004

收稿日期:2016-01-17 出版日期:2018-01-10 发布日期:2018-06-06
作者简介:苏国韶，男，1973年生，博士，教授，主要从事深部地下工程防灾与安全方面的研究工作。
基金资助:
国家自然科学基金资助项目(No. 51369007)。

Load-bearing characteristics of surrounding rock of hydraulic tunnels under high temperature and hydraulic pressure conditions using coupled thermo-hydro-mechanical-damage numerical model

SU Guo-shao^{1, 2}, QIN Zi-hua^{1, 2}, PENG Li-feng^{1, 2}, ZOU Ya-feng^{1, 2}, HU Xiao-chuan^{1, 2}

1. School of Civil and Architecture Engineering, Guangxi University, Nanning, Guangxi 530004, China; 2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China

Received:2016-01-17 Online:2018-01-10 Published:2018-06-06
Supported by:
This work was supported by the National Natural Science Foundation of China (51369007).

摘要/Abstract

摘要： 针对高地温水工高压隧洞围岩的力学行为特点，在考虑岩体的渗透系数、热传导系数随岩体损伤发生变化的基础上，基于多物理场耦合理论，提出一种考虑硬岩强度力学参数劣化的含损伤演化的热-水-力-损伤耦合模型，并给出了该模型的FLAC3D数值实现方法。通过与物理模型试验结果对比，验证了模型的可靠性，进而利用该模型推演了高地温水工高压隧洞的多物理场耦合演化过程，分析了不同影响因素下的承载特性。研究结果表明：隧洞充水运行后，高地温水工高压隧洞的多场耦合效应显著，尤其高地温梯度和高内水压力联合作用下产生的迭加拉应力对围岩的承载安全具有不利影响；温度梯度、内水压力以及岩体线膨胀系数越大，隧洞围岩的损伤程度与开裂深度越大；当隧洞横断面的侧压力系数趋向于1时，洞周出现的宏观裂缝较多，且出现方位不确定；当隧洞横断面侧压力系数小于1/3时，洞周出现的宏观裂缝相对较少，且主要出现在与初始地应力的最大主应力方向相平行的方向上。常规锚喷支护对高地温水工高压隧洞的加固效果不佳。

关键词: 岩石力学, 水工隧洞, 高地温, 多场耦合, 数值模拟

Abstract: To reveal the mechanical behavior characteristics of surrounding rock of hydraulic tunnels under high temperature and hydraulic pressure conditions, this paper proposes a coupled thermo-hydro-mechanical-damage (THMD) model which considers change of hard rock strength parameters involving damage evolution based on multi-field coupling theory with permeability coefficient and heat transfer coefficient varying with rock damage. The implementation of THMD numerical simulation is conducted by the FLAC3D software. The model is proved to be feasible by validation of a physical modeling test, and then the THMD model is employed to deduce the evolution process of multi-field coupling of hydraulic tunnels with high temperature and hydraulic pressure. The evolution process is used to analyze the load-bearing characteristics influenced by different factors. The multi-field coupling effects are very significant in hydraulic tunnels with high temperature and hydraulic pressure after water-filling operation. The complex tensile stress generated by combined load of high temperature gradient and hydraulic pressure contributes to adverse impacts on safe performance of surrounding rock. The damage and crack depth of surrounding rock are larger if the temperature gradient, hydraulic pressure and thermal expansion coefficient are larger. If the lateral pressure coefficient is close to 1, more cracks around the tunnel with random directions tend to form. If the lateral pressure coefficient is less than 1/3, fewer cracks appear around the tunnel and the directions of the cracks are mostly parallel to the direction of the maximum initial stress. The general bolt-shotcrete support does not have good performance in reinforcement of hydraulic tunnels.

Key words: rock mechanics, hydraulic tunnel, high temperature, multi-field coupling, numerical simulation

中图分类号:

TV 314

苏国韶，秦子华，彭立锋，邹亚峰，胡小川, . 基于热-水-力-损伤耦合数值模型的高地温水工高压隧洞围岩承载特性[J]. , 2018, 39(1): 308-319.

SU Guo-shao, QIN Zi-hua, PENG Li-feng, ZOU Ya-feng, HU Xiao-chuan, . Load-bearing characteristics of surrounding rock of hydraulic tunnels under high temperature and hydraulic pressure conditions using coupled thermo-hydro-mechanical-damage numerical model[J]. , 2018, 39(1): 308-319.

参考文献

相关文章 15

[1]	黄巍, 肖维民, 田梦婷, 张林浩, . 不规则柱状节理岩体力学特性模型试验研究[J]. 岩土力学, 2020, 41(7): 2349-2359.
[2]	毛浩宇, 徐奴文, 李彪, 樊义林, 吴家耀, 孟国涛, . 基于离散元模拟和微震监测的白鹤滩水电站左岸地下厂房稳定性分析[J]. 岩土力学, 2020, 41(7): 2470-2484.
[3]	史林肯, 周辉, 宋明, 卢景景, 张传庆, 路新景, . 深部复合地层TBM开挖扰动模型试验研究[J]. 岩土力学, 2020, 41(6): 1933-1943.
[4]	张振, 张朝, 叶观宝, 王萌, 肖彦, 程义, . 劲芯水泥土桩承载路堤渐进式失稳破坏机制[J]. 岩土力学, 2020, 41(6): 2122-2131.
[5]	苏杰, 周正华, 李小军, 董青, 李玉萍, 陈柳. 基于偏振特性的下孔法剪切波到时判别问题探讨[J]. 岩土力学, 2020, 41(4): 1420-1428.
[6]	金俊超, 佘成学, 尚朋阳. 基于Hoek-Brown准则的岩石应变软化模型研究[J]. 岩土力学, 2020, 41(3): 939-951.
[7]	杨高升, 白冰, 姚晓亮, . 高含冰量冻土路基融化固结规律研究[J]. 岩土力学, 2020, 41(3): 1010-1018.
[8]	侯会明, 胡大伟, 周辉, 卢景景, 吕涛, 张帆. 考虑开挖损伤的高放废物地质处置库温度-渗流-应力耦合数值模拟方法[J]. 岩土力学, 2020, 41(3): 1056-1064.
[9]	马秋峰, 秦跃平, 周天白, 杨小彬. 岩石剪切断裂面接触算法的开发与应用[J]. 岩土力学, 2020, 41(3): 1074-1085.
[10]	李康, 王威, 杨典森, 陈卫忠, 亓宪寅, 谭彩. 周期振荡法在低渗透测量中的应用研究[J]. 岩土力学, 2020, 41(3): 1086-1094.
[11]	李翻翻, 陈卫忠, 雷江, 于洪丹, 马永尚, . 基于塑性损伤的黏土岩力学特性研究[J]. 岩土力学, 2020, 41(1): 132-140.
[12]	张艳博, 孙林, 姚旭龙, 梁鹏, 田宝柱, 刘祥鑫, . 花岗岩破裂过程声发射关键信号时频特征试验研究[J]. 岩土力学, 2020, 41(1): 157-165.
[13]	夏坤, 董林, 蒲小武, 李璐, . 黄土塬地震动响应特征分析[J]. 岩土力学, 2020, 41(1): 295-304.
[14]	郭院成, 李明宇, 张艳伟, . 预应力锚杆复合土钉墙支护体系增量解析方法[J]. 岩土力学, 2019, 40(S1): 253-258.
[15]	闫国强, 殷跃平, 黄波林, 张枝华, 代贞伟, . 三峡库区巫山金鸡岭滑坡成因机制与变形特征[J]. 岩土力学, 2019, 40(S1): 329-340.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

基于热-水-力-损伤耦合数值模型的高地温水工高压隧洞围岩承载特性

Load-bearing characteristics of surrounding rock of hydraulic tunnels under high temperature and hydraulic pressure conditions using coupled thermo-hydro-mechanical-damage numerical model

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 0