LI Lihui, LIU Jianli, FU Yan, YANG Zhifa, ZHANG Zhongjian. 2012: EIGHT YEARS TEST RESULTS OF WEATHERING RATES AND TIME LIMIT PREDICTION OF CHISEL IMPRINTS ON PELITIC SILTSTONE INSIDE FIVE LONGYOU CAVERNS. JOURNAL OF ENGINEERING GEOLOGY, 20(5): 706-714.
    Citation: LI Lihui, LIU Jianli, FU Yan, YANG Zhifa, ZHANG Zhongjian. 2012: EIGHT YEARS TEST RESULTS OF WEATHERING RATES AND TIME LIMIT PREDICTION OF CHISEL IMPRINTS ON PELITIC SILTSTONE INSIDE FIVE LONGYOU CAVERNS. JOURNAL OF ENGINEERING GEOLOGY, 20(5): 706-714.

    EIGHT YEARS TEST RESULTS OF WEATHERING RATES AND TIME LIMIT PREDICTION OF CHISEL IMPRINTS ON PELITIC SILTSTONE INSIDE FIVE LONGYOU CAVERNS

    • This paper presents a case study on the weathering rate of pelitic siltstone as the surrounding rock of Longyou underground caverns. The chisel imprints on the inner surface of the surrounding rock were measured using the mixture of plasticene and additives in 2004, 2008 and 2012,respectively. The maximum height difference and fluctuation ratio are adopted as the quantitative indexes to describe the shapes of the chisel imprints. According to the measured results, the weathering rate of the surrounding rock is calculated. The average weathering rate is about 0.28 to 0.5mma-1.The maximum weathering rate is about 0.46~0.89mma-1.The weathering rate value in the last 4 years is smaller than that in the former 4 years. Under the micro-environment, the weathering time limit of the 5 caverns is about 30 years, which means the chisel imprints would be vanished within 100 years. Protective measures should be carried out as fast as possible. The research results can provide scientific supports for the protection of Longyou Caverns, scientific and reasonable development of national cultural relics and reduce of management risks.
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