Reflect Elastic-wave technology to Detect weak Terrane

<b<Objective</b< It is a new method that adopt reflect Elastic-wave technology to ascertain weak terrain under pile. <b<Methods and materials</b< Take a practical project for a background, by exceed detect technology. <b<Results</b< Practical digging up and the situation after building proved the technology save time and cheaper. <b<Conclusion</b< The technology is economical, save time and nicety, and it's a reference for architects and builders.