| Citation: | ZHOU Shaowei, BIAN Xiaowei, LI Weibo, MA Yuanyuan, LI Fei. Nonlinear degradation of stability of Q2 loess slopes in northern Shaanxi considering rainfall conditions[J]. Bulletin of Geological Science and Technology, 2024, 43(3): 218-226. doi: 10.19509/j.cnki.dzkq.tb20230432
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Rainfall disasters are one of the most common disasters on loess slopes in northern Shaanxi, and revealing the effects of rainfall on loess slope stability is beneficial for preventing and controlling such disasters.
This research studied the mechanical properties of Q2 loess in northern Shaanxi under rainfall conditions through a series of tests. Combined with numerical simulation technology, the influence of these changes on the stability of loess slopes in northern Shaanxi was analyzed.Firstly, the drying-wetting cycles test (cyclic path and the number of cycles) was designed to simulate rainfall conditions (such as intensity, frequency, etc.).Secondly, a triaxial shear test was performed to obtain the variation law of the mechanical properties of the Q2 loess in northern Shaanxi.Finally, taking a loess slope in northern Shaanxi region as an example, finite element calculations were carried out, by which the change characteristics of the slope safety coefficients and plasticity zones under different rainfall conditions were analyzed.
The results show that (1) the shear strength of Q2 loess after the action of drying-wetting cycles has nonlinear deterioration characteristics. When the number of drying-wetting cycles exceeds a specific range, the marginal effect of the deterioration of the physical and mechanical property parameters of loess is weakened and tends to stabilize. (2) The stability of loess slopes decreases under the effect of rainfall, and it decreases with the increase of rainfall frequency or intensity. (3) The plastic zone of Q2 loess slopes in northern Shaanxi increases with the continuous deterioration of the mechanical properties of the Q2 loess, which reveals a nonlinear characteristic of the influence of rainfall on the stability of the loess slopes.
The research results can provide a reference for preventing rainfall-induced landslide.
| [1] |
彭建兵, 林鸿州, 王启耀, 等. 黄土地质灾害研究中的关键问题与创新思路[J]. 工程地质学报, 2014, 22(4): 684-691. https://www.cnki.com.cn/Article/CJFDTOTAL-GCDZ201404018.htm
PENG J B, LIN H Z, WANG Q Y, et al. The critical issues and creative concepts in mitigation research of loess geological hazards[J]. Journal of Engineering Geology, 2014, 22(4): 684-691. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-GCDZ201404018.htm
|
| [2] |
LI Y R, SHI W H, AYDIN A, et al. Loess genesis and worldwide distribution[J]. Earth-Science Reviews, 2020, 201: 102947. doi: 10.1016/j.earscirev.2019.102947
|
| [3] |
李泽坤, 马鹏辉, 彭建兵, 等. 黑方台地区马兰黄土渗透特性及结构损伤试验研究[J]. 地质科技通报, 2022, 41(6): 200-210. doi: 10.19509/j.cnki.dzkq.2022.0251
LI Z K, MA P H, PENG J B, et al. Experimental study on the permeability characteristics and structure damage of Malan loess in Heifangtai area[J]. Bulletin of Geological Science and Technology, 2022, 41(6): 200-210. (in Chinese with English abstract) doi: 10.19509/j.cnki.dzkq.2022.0251
|
| [4] |
ZHUANG J Q, PENG J B. A coupled slope cutting: A prolonged rainfall-induced loess landslide: A 17 October 2011 case study[J]. Bulletin of Engineering Geology and the Environment, 2014, 73(4): 997-1011. doi: 10.1007/s10064-014-0645-1
|
| [5] |
卢永兴, 陈剑, 霍志涛, 等. 降雨与开挖作用下黄土滑坡失稳过程分析: 以关中地区长武县杨厂村老庙滑坡为例[J]. 地质科技通报, 2022, 41(6): 95-104. doi: 10.19509/j.cnki.dzkq.2022.0249
LU Y X, CHEN J, HUO Z T, et al. Analysis of instability process of the loess landslides under rainfall and excavation actions: A case study of Laomiao landslide at Yangchang Village in Changwu County, Guanzhong area[J]. Bulletin of Geological Science and Technology, 2022, 41(6): 95-104. (in Chinese with English abstract) doi: 10.19509/j.cnki.dzkq.2022.0249
|
| [6] |
QI T J, ZHAO Y, MENG X M, et al. AI-based susceptibility analysis of shallow landslides induced by heavy rainfall in Tianshui, China[J]. Remote Sensing, 2021, 13(9): 1819. doi: 10.3390/rs13091819
|
| [7] |
李同录, 李颖喆, 赵丹旗, 等. 对水致黄土斜坡破坏模式及稳定性分析原则的思考[J]. 中国地质灾害与防治学报, 2022, 33(2): 25-32. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGDH202202004.htm
LI T L, LI Y Z, ZHAO D Q, et al. Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis[J]. The Chinese Journal of Geological Hazard and Control, 2022, 33(2): 25-32. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGDH202202004.htm
|
| [8] |
LENG Y Q, PENG J B, WANG Q Y, et al. A fluidized landslide occurred in the Loess Plateau: A study on loess landslide in South Jingyang Tableland[J]. Engineering Geology, 2018, 236: 129-136. doi: 10.1016/j.enggeo.2017.05.006
|
| [9] |
GUO Z Y, HUANG Q B, LIU Y, et al. Model experimental study on the failure mechanisms of a loess-bedrock fill slope induced by rainfall[J]. Engineering Geology, 2023, 313: 106979. doi: 10.1016/j.enggeo.2022.106979
|
| [10] |
CUI S H, PEI X J, WU H Y, et al. Centrifuge model test of an irrigation-induced loess landslide in the Heifangtai loess platform, Northwest China[J]. Journal of Mountain Science, 2018, 15(1): 130-143. doi: 10.1007/s11629-017-4490-0
|
| [11] |
同霄, 彭建兵, 朱兴华, 等. 黄土地区降雨的优势入渗深度[J]. 水土保持通报, 2017, 37(3): 231-236. https://www.cnki.com.cn/Article/CJFDTOTAL-STTB201703039.htm
TONG X, PENG J B, ZHU X H, et al. Advantage infiltration depth of rainfall in loess area[J]. Bulletin of Soil and Water Conservation, 2017, 37(3): 231-236. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-STTB201703039.htm
|
| [12] |
马鹏辉, 彭建兵, 朱兴华, 等. 黄土浅层降雨入渗规律研究[J]. 水土保持通报, 2017, 37(4): 248-253. https://www.cnki.com.cn/Article/CJFDTOTAL-STTB201704042.htm
MA P H, PENG J B, ZHU X H, et al. Regularities of rainfall infiltration in shallow loess[J]. Bulletin of Soil and Water Conservation, 2017, 37(4): 248-253. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-STTB201704042.htm
|
| [13] |
SUN P, WANG H J, WANG G, et al. Field model experiments and numerical analysis of rainfall-induced shallow loess landslides[J]. Engineering Geology, 2021, 295: 106411. doi: 10.1016/j.enggeo.2021.106411
|
| [14] |
韩幽铭, 桂蕾, 朱兴华, 等. 滑坡张拉变形区砌体房屋变形破坏特征数值模拟[J]. 地质科技通报, 2023, 42(3): 55-62. doi: 10.19509/j.cnki.dzkq.tb20220718
HAN Y M, GUI L, ZHU X H, et al. Numerical simulation of masonry building deformation and failure characteristics in landslide tension areas[J]. Bulletin of Geological Science and Technology, 2023, 42(3): 55-62. (in Chinese with English abstract) doi: 10.19509/j.cnki.dzkq.tb20220718
|
| [15] |
邵生俊, 罗爱忠, 于清高, 等. 加荷增湿作用下Q3黏黄土的结构损伤特性[J]. 岩土工程学报, 2006, 28(12): 2077-2081. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200612005.htm
SHAO S J, LUO A Z, YU Q G, et al. Structural damage characteristics of Q3 clay loess under loading and humidification[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(12): 2077-2081. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC200612005.htm
|
| [16] |
陈存礼, 高鹏, 胡再强. 黄土的增湿变形特性及其与结构性的关系[J]. 岩石力学与工程学报, 2006, 25(7): 1352-1360. doi: 10.3321/j.issn:1000-6915.2006.07.009
CHEN C L, GAO P, HU Z Q. Moistening deformation characteristic of loess and its relation to structure[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(7): 1352-1360. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2006.07.009
|
| [17] |
王飞, 李国玉, 穆彦虎, 等. 干湿循环条件下压实黄土变形特性试验研究[J]. 岩土力学, 2016, 37(8): 2306-2312. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201608024.htm
WANG F, LI G Y, MU Y H, et al. Experimental study of deformation characteristics of compacted loess subjected to drying-wetting cycle[J]. Rock and Soil Mechanics, 2016, 37(8): 2306-2312. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201608024.htm
|
| [18] |
袁志辉, 倪万魁, 唐春, 等. 干湿循环下黄土强度衰减与结构强度试验研究[J]. 岩土力学, 2017, 38(7): 1894-1902. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201707007.htm
YUAN Z H, NI W K, TANG C, et al. Experimental study of structure strength and strength attenuation of loess under wetting-drying cycle[J]. Rock and Soil Mechanics, 2017, 38(7): 1894-1902. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201707007.htm
|
| [19] |
LI P, VANAPALLI S, LI T L. Review of collapse triggering mechanism of collapsible soils due to wetting[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2016, 8(2): 256-274. doi: 10.1016/j.jrmge.2015.12.002
|
| [20] |
郝延周, 王铁行, 汪朝, 等. 干湿循环作用下压实黄土三轴剪切特性试验研究[J]. 水利学报, 2021, 52(3): 359-368. https://www.cnki.com.cn/Article/CJFDTOTAL-SLXB202103012.htm
HAO Y Z, WANG T X, WANG Z, et al. Experimental study on triaxial shear characteristics of compacted loess under drying and wetting cycles[J]. Journal of Hydraulic Engineering, 2021, 52(3): 359-368. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-SLXB202103012.htm
|
| [21] |
YE W J, ZHANG Y Y. Effect of dry-wet cycle on the formation of loess slope spalling hazards[J]. Civil Engineering Journal, 2018, 4(4): 785. doi: 10.28991/cej-0309133
|
| [22] |
ZHANG F Y, WANG G H, KAMAI T, et al. Undrained shear behavior of loess saturated with different concentrations of sodium chloride solution[J]. Engineering Geology, 2013, 155: 69-79. doi: 10.1016/j.enggeo.2012.12.018
|
| [23] |
LIAN B Q, WANG X G, ZHAN H B, et al. Creep mechanical and microstructural insights into the failure mechanism of loess landslides induced by dry-wet cycles in the Heifangtai platform, China[J]. Engineering Geology, 2022, 300: 106589. doi: 10.1016/j.enggeo.2022.106589
|
| [24] |
刘禹阳, 安驰, 来弘鹏, 等. 不同干湿循环路径下Q2原状黄土强度与微观结构演化试验[J]. 中国公路学报, 2022, 35(12): 168-180. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL202212014.htm
LIU Y Y, AN C, LAI H P, et al. Experimental research on strength and microstructure evolution of Q2 undisturbed loess under different wetting-drying cycle paths[J]. China Journal of Highway and Transport, 2022, 35(12): 168-180. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL202212014.htm
|
| [25] |
朱彦鹏, 杨晓宇, 马孝瑞, 等. 边坡稳定性分析双折减法的几个问题[J]. 岩土力学, 2018, 39(1): 331-338. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201801041.htm
ZHU Y P, YANG X Y, MA X R, et al. Several questions of double reduction method for slope stability analysis[J]. Rock and Soil Mechanics, 2018, 39(1): 331-338. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201801041.htm
|
| [26] |
黄俊, 党发宁, 覃源, 等. 高地应力黄土公路隧道稳定性储备[J]. 长安大学学报(自然科学版), 2016, 36(3): 33-40. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL201603006.htm
HUANG J,DANG F N,QIN Y,et al. Stability reserve of loess highway tunnel under high ground stress[J]. Journal of Chang′an University (Natural Science Edition),2016,36(3):33-40. (in Chinese with English abstract) https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL201603006.htm
|
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