›› 2014, Vol. 35 ›› Issue (9): 2667-2672.

• Geotechnical Engineering • Previous Articles     Next Articles

Experimental study of foundation treatment with vacuum well-point dewatering

ZHANG Yong1, ZHAO Yun-yun1, GAO Wen-long2   

  1. 1. School of Water Conservancy and Electric Power, Hebei University of Engineering, Handan, Hebei 056021, China; 2. North China Power Engineering Co., Ltd., Beijing 100011, China
  • Received:2013-05-19 Online:2014-09-10 Published:2014-09-16

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Abstract: To analyze the feasibility of coastal soft soil foundation treatment using vacuum well-point dewatering, along the Bohai Sea region in the south of Tianjin Hangu district, a certain power plant construction site, a consolidation experiment is made by use of vacuum well-point pumping on site. In order to analyze the effect of consolidation test, groundwater level observation and pore water pressure test are all arranged and different depths of soil are tested before and after the test. After the comparative analysis of the data of static cone penetration test, vane shear test and soil test before and after dewatering, the results show that the consolidation effect is remarkable; a short period of time after the start of the pumping test (within 75 d), the foundation can be reinforced to achieve the consolidation of stability; specific penetration resistance increased from 200 to 300 kPa; and average of vane shear strength increased from 30 to 50 kPa; foundation bearing capacity can be increased to 120 kPa. The consolidation tests show that, it is feasible in soft soil foundation treatment with vacuum well-point.

Key words: vacuum well-point, foundation treatment, cone penetration , vane shear test, pore water pressure

CLC Number: 

  • TU 470
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