Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel Strata
The dewatering of deep foundation pits excavated in highly permeable geology usually requires waterproofing technologies to relieve groundwater flow. However, no effective prediction formula is yet available for determining water inflow in the presence of partial penetrating curtains. In this study,...
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MDPI AG
2019-10-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/11/10/2182 |
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doaj-8399fedd805c470dbd7331f71df47c0a2020-11-25T02:30:04ZengMDPI AGWater2073-44412019-10-011110218210.3390/w11102182w11102182Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel StrataLinghui Liu0Mingfeng Lei1Chengyong Cao2Chenghua Shi3School of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaThe dewatering of deep foundation pits excavated in highly permeable geology usually requires waterproofing technologies to relieve groundwater flow. However, no effective prediction formula is yet available for determining water inflow in the presence of partial penetrating curtains. In this study, a dewatering project with partial penetrating curtains is analyzed via a finite difference method to show evident three-dimensional (3D) seepage characteristics. The standard curve and distortion functions are established under the assumption of an equivalent well by quantifying the blocking effects; thus, the empirical inflow prediction formulas for steady flow are further developed. Moreover, a dewatering design method based on the prediction formulas is proposed and applied to the field dewatering project in sand and gravel strata. Measured results show that dewatering efficiency is considerably enhanced by 3D flow, forming appropriate pressure distributions for dewatering construction. The uplift pressure below the pit bottom is controlled within a 25% safety margin to verify the reliability of the design method.https://www.mdpi.com/2073-4441/11/10/2182sand and gravel stratagroundwater flowpartial penetrating curtaininflow predictiondewatering scheme design |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Linghui Liu Mingfeng Lei Chengyong Cao Chenghua Shi |
| spellingShingle |
Linghui Liu Mingfeng Lei Chengyong Cao Chenghua Shi Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel Strata Water sand and gravel strata groundwater flow partial penetrating curtain inflow prediction dewatering scheme design |
| author_facet |
Linghui Liu Mingfeng Lei Chengyong Cao Chenghua Shi |
| author_sort |
Linghui Liu |
| title |
Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel Strata |
| title_short |
Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel Strata |
| title_full |
Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel Strata |
| title_fullStr |
Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel Strata |
| title_full_unstemmed |
Dewatering Characteristics and Inflow Prediction of Deep Foundation Pits with Partial Penetrating Curtains in Sand and Gravel Strata |
| title_sort |
dewatering characteristics and inflow prediction of deep foundation pits with partial penetrating curtains in sand and gravel strata |
| publisher |
MDPI AG |
| series |
Water |
| issn |
2073-4441 |
| publishDate |
2019-10-01 |
| description |
The dewatering of deep foundation pits excavated in highly permeable geology usually requires waterproofing technologies to relieve groundwater flow. However, no effective prediction formula is yet available for determining water inflow in the presence of partial penetrating curtains. In this study, a dewatering project with partial penetrating curtains is analyzed via a finite difference method to show evident three-dimensional (3D) seepage characteristics. The standard curve and distortion functions are established under the assumption of an equivalent well by quantifying the blocking effects; thus, the empirical inflow prediction formulas for steady flow are further developed. Moreover, a dewatering design method based on the prediction formulas is proposed and applied to the field dewatering project in sand and gravel strata. Measured results show that dewatering efficiency is considerably enhanced by 3D flow, forming appropriate pressure distributions for dewatering construction. The uplift pressure below the pit bottom is controlled within a 25% safety margin to verify the reliability of the design method. |
| topic |
sand and gravel strata groundwater flow partial penetrating curtain inflow prediction dewatering scheme design |
| url |
https://www.mdpi.com/2073-4441/11/10/2182 |
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