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Reinforcement method and case study of vibro stone columns improvement
of complex dam foundation
1，2 1 1，3，4 2 5 6
LIN Peng ，CHEN Daoxiang ，ZHANG Zhiwei ，LI Zichang ，LI Guo ，PENG Wenming
（1. Department of Hydraulic Engineering，Tsinghua University，Beijing 100084，China；2. Sichuan Energy Internet Research
Institute，Tsinghua University，Chengdu 610213，China；3. Yajiang Clean Energy Science and Technology Research （Beijing）Co.，Ltd.，
Beijing 100089，China；4. Technological Innovation Center of Hydropower，Wind，Solar and Energy Storage of Tibet Autonomous Region，
Chengdu 610072，China；5. China Huaneng Group Co.，Ltd.，Beijing 100031，China；
6. Power China Chengdu Engineering Co.，Ltd.，Chengdu 610072，China）
Abstract：Dam construction in the southwest high-altitude region of China often faces the problem of dam foundation
improvement for deep and weak soil layers，and vibro stone columns are usually the primary choice. Based on the
complex dam foundation cases improved by vibro stone columns，this study proposes the reinforcement design，analy‐
sis，and quality control method of vibro stone columns，which includes clarification of stratum characteristics，optimi‐
zation of design parameters，selection of construction equipment and technology，quality control during the process，
and post-work inspection. A unified calculation method for the replacement rate based on the intrinsic characteristics
of the spacing between columns and rows is proposed. The optimality of the equilateral triangular layout is demon‐
strated in terms of soil compaction and vibration during construction，as well as drainage consolidation and pore pres‐
sure dissipation in the soil between piles during operation. Two typical cases of improvement effects and adaptability
analysis have been carried out：（1）the seismic and liquefaction resistance effect of vibro stone column improvement
at Tongzhong Dam under extreme earthquake conditions；（2）Yingliangbao Dam foundation set a precedent for intelli‐
gent vibrofloation，stone columns were installed through the upper pebble gravel layer to improve the lower weak
layer，the shear wave velocity of the foundation soil is increased by approximately 15%-20%，and the coefficient of
safety against liquefaction in the treated area increased by 1.8-2.0 times. The results can provide a reference for the
improvement design and intelligent construction of ultra-deep overburden foundations of complex hydraulic structures
in high altitude areas.
Keywords：hydropower engineering；vibro stone column；intelligent vibroflotation；vibroflotation reinforcement
method；ultra-deep overburden foundation
（责任编辑：韩 昆）
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