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| EXPERIMENTAL STUDY OF MECHANICAL PROPERTY OF LIMESTONE UNDER COUPLED CHEMICAL SOLUTION AND FREEZING-THAWING PROCESS |
| DING Wuxiu1，XU Tao2，WANG Hongyi1，CHEN Jianping3 |
(1. Department of Civil Engineering，Luoyang Institute of Science and Technology，Luoyang，Henan 471023，China；
2. China Construction Seventh Engineering Division Co.，Ltd.，Zhengzhou，Henan 450002，China；
3. Institute of Longmen Grottoes，Luoyang，Henan 471023，China) |
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Abstract Mechanical experiments of the limestone samples from Longmen grottoes under the action of coupled chemical solutions and freezing-thawing processes were carried out to investigate the infiltrated water erosion and freezing-thawing damage on the surrounding rocks in Longmen grottoes. The results of the experiments demonstrated that the mechanical damage of limestone was increased gradually as with increasing freezing- thawing cycles under the coupled chemical solution and freezing-thawing processes and the damage was greater than that under the erosion of chemical solutions only. For example，for the cases of the freezing-thawing cycles of 90 under the coupled chemical solution and freezing-thawing processes，the strengths of the specimens soaked in the distilled water，Longmen water and NaCl solution dropped 50.73%，54.92% and 57.67% respectively compared with the specimen strength in the natural state. While under the erosion of chemical solutions without freezing-thawing，the strengths was dropped only 21.58%，22.88% and 28.72% respectively. The freezing-thawing deterioration model of limestone under investigation was found to be all due to the particle loss model. The abundance of the condensation nuclei and the pH value of water solution were found to be the important factors affecting the degree of damage to the limestone under the coupled chemical solution and freezing-thawing processes. An equation describing the erosion damage to limestone under coupled action was established.
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2015, Vol. 34 
