Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis
The action on water slope includes surface water flow and surface water infiltration, and surface water flow, such as slope damage of reservoir and river banks, is caused by hydrodynamic erosion. At present, there are some vague concepts in slope stability analysis under the influence of surface wat...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of The Chinese Journal of Geological Hazard and Control
2022-04-01
|
| Series: | Zhongguo dizhi zaihai yu fangzhi xuebao |
| Subjects: | |
| Online Access: | https://www.zgdzzhyfzxb.com/en/article/doi/10.16031/j.cnki.issn.1003-8035.2022.02-04 |
| _version_ | 1797865954154119168 |
|---|---|
| author | Tonglu LI LI Yingzhe Danqi ZHAO Xiangyang HU Ping LI |
| author_facet | Tonglu LI LI Yingzhe Danqi ZHAO Xiangyang HU Ping LI |
| author_sort | Tonglu LI |
| collection | DOAJ |
| description | The action on water slope includes surface water flow and surface water infiltration, and surface water flow, such as slope damage of reservoir and river banks, is caused by hydrodynamic erosion. At present, there are some vague concepts in slope stability analysis under the influence of surface water infiltration in loess. For example, ignoring the stress path in the infiltration process and only considering the stress state at the time of its failure will lead to misjudgment of its failure mechanism and the value of stability calculation parameters. This paper aims to analyses and clarify the issues. There are two sources of groundwater in loess, those are rainfall and irrigation. Rainfall infiltration produces shallow slope failure during raining time, while irrigation causes groundwater level rising to trigger deep seated slide. Surface water infiltration can make a remarkable rising of pore water pressure, but minor change of the total stress, and a consequent decreasing of effective stress in the slope, which is the cause of slope failure triggered by water. The initial pore water pressure in unsaturated loess is negative, and the shallow loess after rainfall infiltration is still in unsaturated state, and the pore water pressure rises to 0 at the maximum. Irrigation will cause the groundwater level to rise, and the pore water pressure under the water table will be positive. When the change process of pore water pressure is made clear, the slope stability can be evaluated by effective strength. At the same time, at present, some opinions think that the landslide of flowing loess is caused by static state, which reverses the causality, and it is the slip that causes liquefaction, not the slip caused by liquefaction. |
| first_indexed | 2024-04-09T23:16:26Z |
| format | Article |
| id | doaj.art-75e0c09a87e24bbcbf784a776134876a |
| institution | Directory Open Access Journal |
| issn | 1003-8035 |
| language | zho |
| last_indexed | 2024-04-09T23:16:26Z |
| publishDate | 2022-04-01 |
| publisher | Editorial Office of The Chinese Journal of Geological Hazard and Control |
| record_format | Article |
| series | Zhongguo dizhi zaihai yu fangzhi xuebao |
| spelling | doaj.art-75e0c09a87e24bbcbf784a776134876a2023-03-22T07:50:21ZzhoEditorial Office of The Chinese Journal of Geological Hazard and ControlZhongguo dizhi zaihai yu fangzhi xuebao1003-80352022-04-01332253210.16031/j.cnki.issn.1003-8035.2022.02-04202201031Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysisTonglu LI0LI Yingzhe1Danqi ZHAO2Xiangyang HU3Ping LI4College of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaPower China Northwest Engineering Corporation Limited, Xi’an, Shaanxi 710065, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaThe action on water slope includes surface water flow and surface water infiltration, and surface water flow, such as slope damage of reservoir and river banks, is caused by hydrodynamic erosion. At present, there are some vague concepts in slope stability analysis under the influence of surface water infiltration in loess. For example, ignoring the stress path in the infiltration process and only considering the stress state at the time of its failure will lead to misjudgment of its failure mechanism and the value of stability calculation parameters. This paper aims to analyses and clarify the issues. There are two sources of groundwater in loess, those are rainfall and irrigation. Rainfall infiltration produces shallow slope failure during raining time, while irrigation causes groundwater level rising to trigger deep seated slide. Surface water infiltration can make a remarkable rising of pore water pressure, but minor change of the total stress, and a consequent decreasing of effective stress in the slope, which is the cause of slope failure triggered by water. The initial pore water pressure in unsaturated loess is negative, and the shallow loess after rainfall infiltration is still in unsaturated state, and the pore water pressure rises to 0 at the maximum. Irrigation will cause the groundwater level to rise, and the pore water pressure under the water table will be positive. When the change process of pore water pressure is made clear, the slope stability can be evaluated by effective strength. At the same time, at present, some opinions think that the landslide of flowing loess is caused by static state, which reverses the causality, and it is the slip that causes liquefaction, not the slip caused by liquefaction.https://www.zgdzzhyfzxb.com/en/article/doi/10.16031/j.cnki.issn.1003-8035.2022.02-04loess slopeshallow failuredeep seated sliderainfallirrigation |
| spellingShingle | Tonglu LI LI Yingzhe Danqi ZHAO Xiangyang HU Ping LI Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis Zhongguo dizhi zaihai yu fangzhi xuebao loess slope shallow failure deep seated slide rainfall irrigation |
| title | Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis |
| title_full | Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis |
| title_fullStr | Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis |
| title_full_unstemmed | Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis |
| title_short | Thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis |
| title_sort | thoughts on modes of loess slope failure triggered by water infiltration and the principals for stability analysis |
| topic | loess slope shallow failure deep seated slide rainfall irrigation |
| url | https://www.zgdzzhyfzxb.com/en/article/doi/10.16031/j.cnki.issn.1003-8035.2022.02-04 |
| work_keys_str_mv | AT tongluli thoughtsonmodesofloessslopefailuretriggeredbywaterinfiltrationandtheprincipalsforstabilityanalysis AT liyingzhe thoughtsonmodesofloessslopefailuretriggeredbywaterinfiltrationandtheprincipalsforstabilityanalysis AT danqizhao thoughtsonmodesofloessslopefailuretriggeredbywaterinfiltrationandtheprincipalsforstabilityanalysis AT xiangyanghu thoughtsonmodesofloessslopefailuretriggeredbywaterinfiltrationandtheprincipalsforstabilityanalysis AT pingli thoughtsonmodesofloessslopefailuretriggeredbywaterinfiltrationandtheprincipalsforstabilityanalysis |