基于应变软化的岩土工程单元安全度评价方法研究

姜谙男; 郑帅; 白涛; 段龙梅; 申发义; 赵亮; 薛焕东

doi:10.12090/j.issn.1006-6616.2018.24.06.086

基于应变软化的岩土工程单元安全度评价方法研究

doi: 10.12090/j.issn.1006-6616.2018.24.06.086

1.
大连海事大学道桥所, 辽宁大连 116026
2.
吉林省交通规划设计院, 吉林长春 130021

基金项目:

国家自然科学基金项目 51678101

中央高校基本科研业务费专项资金 3132014326

详细信息

作者简介:
姜谙男(1971-), 男, 教授, 主要从事隧道稳定性与优化等方面的教学和科研。E-mail:jiangannan@163.com

中图分类号: TU45
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- 被引次数: 0
出版历程
- 收稿日期: 2017-07-03
- 修回日期: 2018-08-02
- 刊出日期: 2018-12-01

A STUDY ON EVALUATION METHOD OF GEOTECHNICAL ENGINEERING ZONE SAFETY DEGREE BASED ON STRAIN SOFTENING

1.
Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, Liaoning, China
2.
Jilin Provincial Communication Planning and Design Institute, Changchun 130021, Jilin, China

摘要

摘要: 针对大多已有岩土工程局部安全评价方法未考虑拉伸破坏和屈服、破坏阶段的问题，对围岩的局部安全评价方法进行了相应的改进。基于Mohr-Coulomb屈服准则和应变软化模型建立了单元安全度的评价方法和新的定义，综合考虑剪切和拉伸破坏模式，定义一个统一的变量ZSD来表征和量化岩土体单元从弹性、屈服到破坏的安全程度，实现复杂应力状态下岩土体渐进破坏过程的局部安全性定量评价。推导了ZSD的各阶段表达公式，利用FISH语言在FLAC^3D平台编写程序。通过相应的实例和工程进行了ZSD计算，验证了该方法的正确性与有效性。该方法具有参数表达简单，易于在程序中实现，可通过ZSD所在值域判断单元所处的状态，可直观揭示岩土体渐进破坏过程等诸多优点。该方法为分析和预测岩土工程中危险区域的演化和描述渐进破坏过程提供了有效的手段。
- 应变软化 /
- 单元安全度 /
- 安全评价 /
- 岩土工程
Abstract: In view of the fact that the problems encountered in the stage of tensile failure, yield and failure stage are not considered in most existing local safety evaluation methods of geotechnical engineering, the local safety evaluation method of surrounding rock has been improved accordingly. The new evaluation method and new definition of geotechnical engineering zone safety degree were established based on strain softening model and Mohr-Coulomb yield criterion. It is defined by a uniform variable ZSD (Zone Safety Degree)synthetically considering shear and tension pattern, describing the safety degree of geotechnical body element from elastic stage, yield stage to failure stage, realizing the local safety quantitative evaluation with complex stress state and progressive failure progress. The ZSD expression formulas at different stages are derived, and the program by FISH language based on FLAC^3D platform is compiled. The corresponding examples and engineering are calculated, and the accuracy and efficiency of the ZSD method are verified. This method is simple in parameter expression and easy to be implemented in the program. It can judge the state of the zone in the range of ZSD and directly reveal the progressive failure process of rock and soil mass. This method provides an effective means for the analysis and prediction of the evolution of hazardous areas in geotechnical engineering and the description of the progressive failure process.
- strain softening /
- zone safety degree /
- safety evaluation /
- geotechnical engineering

HTML全文

图 1 典型的岩石应力应变曲线^[13]

Figure 1. Typical stress-strain curves of rock^[13]

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图 2 应变软化模型线弹性卸载

Figure 2. Linear elastic unloading of the strain softening model

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图 3 弹性阶段应力状态分析图

Figure 3. Stress state analysis in the elastic stage

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图 4 边坡计算结果对比图

Figure 4. Comparison of the calculation results of the slope

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图 5 滑移面附近的单元安全度等值线

Figure 5. The ZSD contours near the shear sliding surface

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图 6 数值模型与约束条件

Figure 6. The numerical model and constraint conditions

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图 7 巴西圆盘的ZSD等值线图

Figure 7. ZSD contours of the Brazilian disk

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图 8 隧道数值模型与支护结构

Figure 8. Numerical model and lining structure of the tunnel

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图 9 ZSD等值线图与塑性区图对比

Figure 9. Comparison of ZSD contours and plastic zones

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表 1 ZSD表达式

Table 1. Expression of ZSD

单元状态	弹性阶段		屈服阶段			破坏阶段
判断标准	ε^ps=0, ε^pt=0 (σ₁+σ₃)/2 < σ₀ (剪切)	ε^ps=0, ε^pt=0 (σ₁+σ₃)/2≥σ₀ (拉伸)	0 < ε^ps≤ε^ps ε^pt=0 (剪切)	ε^ps=0 0 < ε^pt≤ε^pt (拉伸)	0 < ε^ps≤ε^ps 0 < ε^pt≤ε^pt (剪切和拉伸)	ε^ps>ε^ps (剪切)	ε^pt>ε^pt (拉伸)
ZSD函数	公式(7)	公式(8)	公式(9)	公式(10)	公式(11)	公式(9)	公式(10)
ZSD性质	ZSD∈[1, +∞)+∞该段最安全状态1进入屈服状态	ZSD∈[1, +∞)+∞该段最安全状态1进入屈服状态	ZSD∈[0, 1)1进入屈服状态0进入破坏状态	ZSD∈[0, 1)1进入屈服状态0进入破坏状态	ZSD∈[0, 1)1进入屈服状态0进入破坏状态	ZSD∈[0, -∞)值越小，破坏程度越高	ZSD∈[0, -∞)值越小，破坏程度越高
单调性	ZSD值随安全性的降低而单调递减

下载: 导出CSV

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