In-situ stress field inversion via IA-BP intelligent algorithm

SUN Gang; WANG Junxiang; GUO Lianjun; KOU Haijun; XU Jinglong

doi:10.11835/j.issn.2096-6717.2021.116

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In-situ stress field inversion via IA-BP intelligent algorithm

Civil Engineering | 更新时间：2023-03-07

- In-situ stress field inversion via IA-BP intelligent algorithm
- Journal of Civil and Environmental Engineering Vol. 45, Issue 2, Pages: 89-99(2023)
- 作者机构：
  
  1.沈阳工业大学建筑与土木工程学院，沈阳 110870
  2.中铁十九局集团第五工程有限公司，辽宁大连 116100
- 作者简介：
  
  SUN Gang (1997- ), main research interests: rock impact and blasting, E-mail: 1761152028@qq.com.
  WANG Junxiang （corresponding author）， associate professor， doctorial supervisor， E-mial： w.j.xgood@163.com.
- 基金信息：
  
  National Natural Science Foundation of China(51774066);Liaoning Natural Science Foundation(2019-MS-242);Liaoning Provincial Education Department Focuses on Tackling Key Problems(LZGD2020004);China Postdoctoral Science Foundation(2018M630293)
- DOI：10.11835/j.issn.2096-6717.2021.116
  CLC： TU431
- Received：15 January 2021，
  
  Published：25 April 2023
- 稿件说明：
移动端阅览
SUN Gang, WANG Junxiang, GUO Lianjun, et al. In-situ stress field inversion via IA-BP intelligent algorithm[J]. Journal of Civil and Environmental Engineering, 2023, 45(2): 89-99.
DOI：

SUN Gang, WANG Junxiang, GUO Lianjun, et al. In-situ stress field inversion via IA-BP intelligent algorithm[J]. Journal of Civil and Environmental Engineering, 2023, 45(2): 89-99. DOI： 10.11835/j.issn.2096-6717.2021.116.

摘要

初始地应力场是地下工程设计与施工的重要依据，在实际工程中难以精准测得，为了能较准确地获得初始地应力场的分布规律，提出将免疫算法与BP神经网络相结合（IA-BP）的算法对初始地应力场进行反演研究。免疫算法优化BP神经网络就是将BP神经网络的连接权值和阈值作为免疫算法中的抗体进行编码。该混合算法既可以利用免疫算法全局寻优的特点快速搜索到全局最优解或次优解附近，又可以采用BP算法避免在最优解和次优解附近发生震荡，对其进行局部优化，从而达到快速收敛全局最优解的目的。通过COMSOL分别构建平面边坡模型及三维立体模型，对其进行正分析计算，将计算的结果作为“实测值”，对地应力进行反演分析，并将IA-BP算法反演的结果与PSO-BP算法及多元线性回归算法的反演结果进行对比。结果表明：二维边坡模型下，IA-BP算法反演结果误差更小。三维模型下，IA-BP算法所得实测值与反演值之间的相对误差的绝对值为0%~10.64%（平均为3.39%），PSO-BP算法所得实测值与反演值之间相对误差的绝对值为0%~48.39%（平均为6.93%），多元线性回归算法所得实测值与反演值之间相对误差的绝对值为0.55%~121.95%（平均为21.87%），通过对比可知，IA-BP算法整体反演结果精度最高。无论是平面模型还是三维模型，利用IA-BP算法反演出的结果与其他两种算法反演的结果相比，误差更小。将IA-BP智能算法运用到地应力场的反演研究中，可以为地下工程的建设提供依据。

Abstract

Initial in-situ stress field is an important basis for design and construction of underground engineering

while it is difficult to accurately measure the initial in-situ stress in engineering practice. In order to accurately obtain distribution law pattem of initial geostress field

the immune algorithm combined with BP neural network (IA-BP algorithm) for inversion of initial in-situ stress field is studied. The optimization of BP neural network by immune algorithm is to encode the connection weights and thresholds of BP neural network as antibodies in the immune algorithm. The hybrid algorithm can not only take advantage of the characteristics of immune algorithm as well as the global optimization quick search for the global optimal solution or near optimal solution

and can also adopt BP algorithm to avoid the near optimal and sub-optimal solutions

oscillation on the local optimization

realizing the aim of fast converge of the global optimal solution. The plane slope model and three-dimensional model were constructed by COMSOL respectively to carry out forward analysis and calculation

and the calculated results were taken as “measured values” to conduct inversion analysis of in-situ stress

but the inversion results of IA-BP algorithm were compared with those of PSO-BP and multiple linear regression algorithms. The results show that the inversion error of IA-BP algorithm is smaller under the two-dimensional (2D) slope model. Under the three-dimensional (3D) model

IA-BP algorithm from the measured values and the inversion of the absolute value of relative error between 0% and 10.64% (3.39% on average)

for PSO-BP

it is between 1% and 48.39% with average value of 6.93%

for MLR

it is between 0.55% and 121.95% with average of 21.87%. By comparison

it can be known that the overall inversion results of IA-BP algorithm have the highest accuracy. In both 2D and 3D models

the error of the inversion results is smaller than those using the other two. The application of IA-BP intelligent algorithm to the inversion of in-situ stress field can provide technical support for the construction of underground engineering.

关键词

Keywords

references

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