Hydraulic fracturing simulation of soils based on XFEM
-
摘要: 水力劈裂会对心墙堆石坝的安全造成严重的负面影响。宏观上,土体水力劈裂可看作是土体在水力楔劈作用下使局部裂缝（薄弱面）进一步发展的破坏过程。XFEM是一种可以有效描述裂缝的数值模拟方法。采用XFEM结合Biot固结理论,并对裂缝单元进行处理,从而以弥散式的裂缝状态和嵌入式的裂缝形态共同描述了土体的水力劈裂过程,并以一个模型算例和挪威Hyttejuvet坝的实际工程算例对方法进行了验证。该工作的成果有助于理解土体水力劈裂的成因和过程,可用于对土工结构物的流固耦合破坏分析。Abstract: Hydraulic fracture will have a serious negative impact on the safety of core rockfill dams. Macroscopically, the hydraulic fracture of soils can be regarded as the failure process of further development of local cracks (weak surfaces) under the action of hydraulic wedge splitting. XFEM is a numerical simulation method which can effectively describe cracks. In this study, XFEM combined with the Biot’s consolidation theory is used to deal with the crack element, so that the hydraulic fracturing process of soils is described by both the dispersive crack state and the embedded crack shape. The method is verified by a model example and a practical engineering example of Hyttejuvet dam in Norway. The results of this work are helpful to understand the cause and process of hydraulic fracture of soils, and can be used for fluid-solid coupling failure analysis of soil structures.
-
Keywords:
- XFEM /
- hydraulic fracture /
- Biot’s consolidation theory
-
-
![]()
图 4 Y方向应力随裂缝发展的分布云图
Figure 4. Nephogram of vertical stress distribution with crack development
![]()
图 5 位移放大5倍的典型时刻孔压分布云图
Figure 5. Nephogram of pore pressure distribution at typical time with displacement magnification of 5 times
![]()
图 9 Hyttejuvet坝渗漏量变化（Kjaernsli和Torblaa,1968）
Figure 9. Change of seepage of Hyttejuvet dam reservoir (Kjaernsli and Torblaa, 1968)
![]()
图 11 两组模型参数常规三轴试验对比
Figure 11. Comparison of two sets of model parameters in conventional triaxial tests
![]()
图 12 两组模型计算的坝体竖向应力分布
Figure 12. Distribution of vertical stress of dam body calculated by two sets of models
![]()
图 13 Hyttejuvet坝典型时刻超静孔压的分布
Figure 13. Distribution of excess pore pressure at typical time of Hyttejuvet dam
![]()
图 14 各测点孔压的监测值和计算值
Figure 14. Measured and calculated values of pore pressure at each measuring point
![]()
图 16 薄弱面单元的竖向应力变化过程
Figure 16. Change process of vertical stress of weak surface element
![]()
图 17 水力劈裂发生后,746 m水头稳定渗流云图
Figure 17. Nephogram of stable seepage after hydraulic fracture under head of 746 m
![]()
图 18 水力劈裂击穿心墙过程中的压力水头云图（单位：m）
Figure 18. Nephograms of water pressure in hydraulic fracture breaking through core wall (Unit: m)
表 1 数值试验的材料参数
Table 1 Material parameters of numerical experiments
材料类型 弹性模量 E/MPa 泊松比 υ 渗透系数/(m·s-1) kx ky 堆石体 10.0 0.3 1 1 压实黏土 1.0 0.3 1×10-8 1×10-8 软弱单元 0.01 0.2 1 1×10-8 
下载: 导出CSV
表 2 坝体材料参数
Table 2 Dam material parameters
材料 φ0/(°) Δφ/(°) K Kb n m Rf k/(m·d-1) 心墙 40.0 10.0 300 100.0 0.20 0.3 1.0 6.05×10-5 堆石 55.0 10.0 1757 805.0 0.27 0.2 1.0 1944
下载: 导出CSV
-
[1] LO K Y, KANIARU K. Hydraulic fracture in earth and rock-fill dams[J]. Canadian Geotechnical Journal, 1990, 27(4): 496-506. doi: 10.1139/t90-064
[2] 沈珠江, 易进栋, 左元明. 土坝水力劈裂的离心模型试验及其分析[J]. 水利学报, 1994(9): 67-78. https://www.cnki.com.cn/Article/CJFDTOTAL-SLXB409.008.htm SHEN Zhu-jiang, YI Jin-dong, ZUO Yuan-ming. Centrifuge model test of hydraulic fracture of earth dam and its analysis[J]. Journal of Hydraulic Engineering, 1994(9): 67-78. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SLXB409.008.htm
[3] 王俊杰, 朱俊高, 张辉. 关于土石坝心墙水力劈裂研究的一些思考[J]. 岩石力学与工程学报, 2005, 24(增刊2): 5664-5668. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2005S2068.htm WANG Jun-jie, ZHU Jun-gao, ZHANG Hui. Some ideas on study of hydraulic fracturing of core of earth-rockfill dam[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(S2): 5664-5668. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2005S2068.htm
[4] 曾开华, 殷宗泽. 土质心墙坝水力劈裂影响因素的研究[J]. 河海大学学报(自然科学版), 2000, 28(3): 1-6. https://www.cnki.com.cn/Article/CJFDTOTAL-HHDX200003000.htm ZENG Kai-hua, YIN Zong-ze. Factors affecting hydraulic fracturing of high earth core dams[J]. Journal of Hohai University(Natural Science), 2000, 28(3): 1-6. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-HHDX200003000.htm
[5] 张丙印, 李娜, 李全明, 等. 土石坝水力劈裂发生机理及模型试验研究[J]. 岩土工程学报, 2005, 27(11): 42-46. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200511009.htm ZHANG Bing-yin, LI Na, LI Quan-ming, et al. Mechanism analysis and model test of hydraulic fracturing in embankment dams[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(11): 1277-1281. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200511009.htm
[6] WANG X, YU P, YU J, et al. Simulated crack and slip plane propagation in soil slopes with embedded discontinuities using XFEM[J]. International Journal of Geomechanics, 2018, 18(12). doi: 10.1061/(ASCE)GM.1943-56220001-0001290.
[7] SONG J H, AREIAS P M A, BELYTSCHKO T. A method for dynamic crack and shear band propagation with phantom nodes[J]. International Journal for Numerical Methods in Engineering, 2006, 67(6): 868-893. doi: 10.1002/nme.1652
[8] 李全明, 张丙印, 于玉贞, 等. 土石坝水力劈裂发生过程的有限元数值模拟[J]. 岩土工程学报, 2007, 29(2): 212-217. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200702011.htm LI Quan-ming, ZHANG Bing-yin, YU Yu-zhen, et al. Numerical simulation of the process of hydraulic fracturing in earth and rockfill dams[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(2): 212-217. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200702011.htm
[9] 李全明. 高土石坝水力劈裂发生的物理机制研究及数值仿真[D]. 北京: 清华大学, 2006. LI Quan-ming. Mechanism Study and Numerical Simulation of Hydraulic Fracturing in High Earth and Rockfill Dam[D]. Beijing: Tsinghua University, 2006. (in Chinese)
[10] KJAERNSLI B, TORBLAA I. Leakage Through Horizontal Cracks in the Core of Hyttejuvet Dam[R]. Oslo, Norwag: Norwegian Geotechnical Insitute, 1968: 39-47.
[11] NG K L A, SMALL J C. Simulation of dams constructed with unsaturated fills during construction and water impounding[C]//Proceedings of the 1st International Conference on Unsaturated Soils. Paris, 1995: 281-286.
[12] NG K L A, SMALL J C. Behavior of joints and interfaces subjected to water pressure[J]. Computers and Geotechnics, 1997, 20(1): 71-93.
[13] NG K L A, SMALL J C. A case study of hydraulic fracturing using finite element methods[J]. Canadian Geotechnical Journal, 1999, 36: 861-875.
-
期刊类型引用(2)
1. 赵瑞，代登辉，武广繁，沈凡茗，薛凯. 考虑土塞效应管桩的竖向动力响应解析解. 河南科学. 2025(05): 625-634 . 
百度学术
2. 刘浩，吴文兵，蒋国盛，梅国雄，梁荣柱，官文杰. 土塞效应对管桩低应变测试视波速的影响研究. 岩土工程学报. 2019(02): 383-389 . 本站查看
其他类型引用(13)
计量
- 文章访问数:
- HTML全文浏览量: 0
- PDF下载量:
- 被引次数: 15
