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| 2D Forward Simulation of Grouting Karst for Pile Foundation with High － density Resistivity Method |
| ZHANG Ji1，SHI Xue － ming2，XIN Min － gao1 |
| 1． The Third Railway Survey and Design Institute Group Corporation，Tianjin 300142，China; 2． China University of Geosciences，Wuhan，Hubei 430074，China |
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Abstract Research purposes: The high － density resistivity method ( HDR) is a commonly used method for detecting the quality of grouting karst of pile foundation． In order to guide the production practice，RES2DMOD 3． 0 was used for 2D forward simulation with high － density resistivity for grouting karst of pile foundation to the geology － earth physical model ．
Research conclusions: The result of numerical simulation shows the full grouting body and defects of grouting karst can be reflected on the resistivity profile drawing respectively by abnormal high resistance and low resistance． The geophysical anomaly is obvious with large abnormal range and small amplitude when using the Wenner array HDR method，and the geophysical anomaly is weaker with small reflection amplitude and vertical distribution when using the Wenner － Schlumberger array and it is difficult to distinguish．
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Received: 28 March 2011
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2011, Vol. 28 
