基于ELM的河谷区域初始地应力场反演分析
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摘要
分析河谷区域地应力场的特殊性,提出基于ELM的河谷区域地应力场反演方法。以某水电站地下厂房项目为工程实例,分析实测地质资料和实测地应力资料,建立大范围区域三维地质体模型。利用ELM和FLAC3D相结合,考虑自重、构造运动和侵蚀下切作用的影响,通过反演计算获取该区域的初始地应力场。对计算结果合理性进行分析,证明了反演方法的工程应用价值。
The particularity of the geostress field in the valley is analyzed,and the inland stress field inversion method based on the ELM is proposed.Taking an underground powerhouse project of a hydropower station as an example,the measured geologic data and measured geostress data are analyzed to establish a large-area three-dimensional geological model.By using the combination of ELM and FLAC3D,the influence of self-weight,tectonic movement and erosion undercutting is considered,and the initial geostress field of the area is obtained by inversion calculation.The rationality of the calculation results is analyzed,which proves the engineering application value of the inversion method.
The particularity of the geostress field in the valley is analyzed,and the inland stress field inversion method based on the ELM is proposed.Taking an underground powerhouse project of a hydropower station as an example,the measured geologic data and measured geostress data are analyzed to establish a large-area three-dimensional geological model.By using the combination of ELM and FLAC3D,the influence of self-weight,tectonic movement and erosion undercutting is considered,and the initial geostress field of the area is obtained by inversion calculation.The rationality of the calculation results is analyzed,which proves the engineering application value of the inversion method.
引文
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[2]易达,陈胜宏,葛修润.岩体初始应力场的遗传算法与有限元联合反演法[J].岩土力学,2004,25(7):1077-1080.
[3]姜谙男,侯林波,伍平.基于粒子群支持向量机的三维初始地应力反分析[C]//第六届全国信息获取与处理学术会议论文集,2008.
[4]李欣,谢学斌,杨承祥,等.基于改进粒子群优化算法的地应力场反演[J].矿冶工程,2015(1):23-26.
[5]ZHU W,LI G,WANG K.Analyses of disking phenomenon and stress field in the region of an underground powerhouse[J].Rock Mechanics&Rock Engineering,1985,18(18):1-15.
[6]叶智峰,曹青.极限学习机在初始地应力场反演中的应用[J].水电能源科学,2016(6):158-160.
[7]刘允芳.岩体地应力与工程建设[M].武汉:湖北科学技术出版社,2000.
[8]朱焕春,陶振宇.地形地貌与地应力分布的初步分析[J].水利水电技术,1994(1):29-34.
[9]朱焕春,陶振宇,黄德凡.河谷走向与河谷地应力分布[J].岩石力学与工程学报,1995(1):17-24.