基于改进Green-Ampt模型的边坡渗水破坏分析

doi:10.16265/j.cnki.issn1003-3033.2022.10.2246

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (10): 57-62.doi: 10.16265/j.cnki.issn1003-3033.2022.10.2246

基于改进Green-Ampt模型的边坡渗水破坏分析

任青阳¹^,²(), 陈斌¹^,², 孟欣¹^,², 靳红华¹^,², 卞林林¹^,², 郑仕跃³

¹ 重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆 400074
² 重庆交通大学土木工程学院,重庆 400074
³ 中海建筑有限公司,广东深圳 518053

收稿日期:2022-04-12 修回日期:2022-08-18 出版日期:2022-10-28 发布日期:2023-04-28
作者简介:
任青阳 (1975—),男,河南南阳人,博士,教授,主要从事土木工程防灾减灾、滑坡演化与控制、岩土本构关系数值建模方面的研究。E-mai:qyren@cqjtu.edu.cn。
郑仕跃高级工程师
基金资助:
国家自然科学基金资助(41472262); 重庆市高校创新研究群体项目(CXQT19021); 重庆市自然科学基金重点项目资助(cstc2020jcyj-zdxmX0012); 重庆交通大学研究生科研创新项目(2020B0002)

Slope seepage failure analysis based on improved Green-Ampt model

REN Qingyang¹^,²(), CHEN Bin¹^,², MENG Xin¹^,², JIN Honghua¹^,², BIAN Linlin¹^,², ZHENG Shiyue³

¹ State Key Laboratory of Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China
² School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
³ China Overseas Construction Limited, Shenzhen Guangdong 518053, China

Received:2022-04-12 Revised:2022-08-18 Online:2022-10-28 Published:2023-04-28

摘要/Abstract

摘要：

为解决因降雨引起边坡渗水破坏的安全稳定性问题,以某桥基边坡为例,充分考虑坡面流水的汇集积水效应,改进Green-Ampt入渗模型;基于改进后的模型计算得到持续性强降雨下边坡雨水入渗时空特征,结合FLAC^3D软件模拟边坡随雨水入渗的渐近性破坏过程。结果表明:由改进模型得到的湿润锋特征与工程实际相符,离坡顶越远雨水的入渗深度越大,雨水入渗速度随降雨时间延长而变缓;由坡面流水引起的湿润锋深度占总深度的比例较大,在前5 h内坡脚处其比例超过50%;边坡的破坏由坡脚向坡顶、由浅向深渐进发展,具有明显的时间间断性和多层逐级后退式渐近性破坏特征。

关键词: Green-Ampt模型, 渗水破坏, 桥基边坡, 碎石土, 渐近性破坏, 数值模拟

Abstract:

In order to solve the safety and stability problem of slope water seepage failure caused by rainfall, taking a bridge foundation slope as an example, the Green-Ampt infiltration model was improved by fully considering the catchment effect of slope flow. Based on the improved model, the temporal and spatial characteristics of slope rainwater infiltration under continuous heavy rainfall were calculated, and the progressive failure process of slope with rainwater infiltration is simulated by FLAC^3D software. The results show that the characteristics of the wetting front obtained by the improved model are in agree with the engineering practice. The farther away from the slope top, the greater the rainwater infiltration depth, and the slower the rainwater infiltration rate with the extension of the rainfall time. The depth of the wetting front caused by overland flow accounts for a large proportion of the total depth, andwhich is more than 50% at the front of the slope in the first 5 hours. The failure of slope develops gradually from toe to top and from shallow to deep, and has obvious characteristics of time discontinuity and multi-layer progressive backward progressive damage.

Key words: Green-Ampt model, seepage failure, bridge foundation slope, gravel soil, progressive failure, numerical simulation

任青阳, 陈斌, 孟欣, 靳红华, 卞林林, 郑仕跃. 基于改进Green-Ampt模型的边坡渗水破坏分析[J]. 中国安全科学学报, 2022, 32(10): 57-62.

REN Qingyang, CHEN Bin, MENG Xin, JIN Honghua, BIAN Linlin, ZHENG Shiyue. Slope seepage failure analysis based on improved Green-Ampt model[J]. China Safety Science Journal, 2022, 32(10): 57-62.

图/表 8

图1

图2

图3

表1

图4

表2

坡脚位置雨水入渗情况分析

时段/ h	A/ mm	A∶ $Z f 30$ / %	B/ mm	B∶A/ %	C/ mm	C∶A/ %
0~5	3 416.33	34.52	1 752.34	51.29	1 663.99	48.71
5~10	1 663.99	16.82	721.55	43.36	942.44	56.64
0~10	5 080.32	51.34	2 473.89	48.70	2 606.43	51.30
10~20	2 606.43	26.34	957.17	36.72	1 649.26	63.28
20~30	2 208.83	22.32	721.55	32.67	1 487.28	67.33

表2

图5

图6

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名称	状态	密度/ (kg·m^-3)	弹性模量/ MPa	泊松比	黏聚力/ kPa	内摩擦角/ (°)
碎石土	天然	1 850	120	0.26	30	38
碎石土	饱和	2 000	80	0.32	25	29
强风化岩	天然	2 100	500	0.25	200	39
中风化岩	天然	2 350	800	0.21	600	43

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基于改进Green-Ampt模型的边坡渗水破坏分析

Slope seepage failure analysis based on improved Green-Ampt model

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