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Investigating the durability of weak rocks to forecast their long-term behaviors
https://orcid.org/0000-0003-2473-524X
Abstract Predicting the long-term durability of weak rocks in civil projects such as cut slopes is a challenging issue in engineering geological studies. In the present research, three types of weak rocks were investigated from the durability point of view in the long-term. For this purpose, Jar Slake and slake durability tests were carried out on the selected samples, and the results were validated based on their mineral compositions. The results showed that samples A and B, which contain clay minerals (montmorillonite and illite, respectively), are less durable than sample C, which is limestone with negligible clay content (slake durability index values for 10th cycle were measured as 21.67%, 37.93%, and 82.12%, respectively). Moreover, the samples with silicate minerals (samples A and B) were sensitive to basic and acidic pHs such that their durability is high, moderate, and low in pHs of 7, 8.5, and 4.5, respectively. In comparison, sample C as a carbonate rock loses its durability as acidity declines. Also, it was found that the duration of durability test is more effective when testing the low-durability rocks such as samples A and B compared to durable rocks such as sample C. Finally, long-term evaluation of the durability of the studied samples was successfully done by plotting the observed durability in natural conditions on the diagram of values of disintegration ratio ($ D_{R} $) versus the number of wetting–drying cycles in laboratory scale. In this regard, the $ D_{R} $ values of samples A, B, and C after 2 years were estimated to be 0.18, 0.24, and 0.23, respectively. The estimated values are strongly consistent with the observed slaking behaviors of the samples in the jar slake tests and the observed behaviors under natural conditions.
Investigating the durability of weak rocks to forecast their long-term behaviors
https://orcid.org/0000-0003-2473-524X
Abstract Predicting the long-term durability of weak rocks in civil projects such as cut slopes is a challenging issue in engineering geological studies. In the present research, three types of weak rocks were investigated from the durability point of view in the long-term. For this purpose, Jar Slake and slake durability tests were carried out on the selected samples, and the results were validated based on their mineral compositions. The results showed that samples A and B, which contain clay minerals (montmorillonite and illite, respectively), are less durable than sample C, which is limestone with negligible clay content (slake durability index values for 10th cycle were measured as 21.67%, 37.93%, and 82.12%, respectively). Moreover, the samples with silicate minerals (samples A and B) were sensitive to basic and acidic pHs such that their durability is high, moderate, and low in pHs of 7, 8.5, and 4.5, respectively. In comparison, sample C as a carbonate rock loses its durability as acidity declines. Also, it was found that the duration of durability test is more effective when testing the low-durability rocks such as samples A and B compared to durable rocks such as sample C. Finally, long-term evaluation of the durability of the studied samples was successfully done by plotting the observed durability in natural conditions on the diagram of values of disintegration ratio ($ D_{R} $) versus the number of wetting–drying cycles in laboratory scale. In this regard, the $ D_{R} $ values of samples A, B, and C after 2 years were estimated to be 0.18, 0.24, and 0.23, respectively. The estimated values are strongly consistent with the observed slaking behaviors of the samples in the jar slake tests and the observed behaviors under natural conditions.
Investigating the durability of weak rocks to forecast their long-term behaviors
https://orcid.org/0000-0003-2473-524X
Abstract Predicting the long-term durability of weak rocks in civil projects such as cut slopes is a challenging issue in engineering geological studies. In the present research, three types of weak rocks were investigated from the durability point of view in the long-term. For this purpose, Jar Slake and slake durability tests were carried out on the selected samples, and the results were validated based on their mineral compositions. The results showed that samples A and B, which contain clay minerals (montmorillonite and illite, respectively), are less durable than sample C, which is limestone with negligible clay content (slake durability index values for 10th cycle were measured as 21.67%, 37.93%, and 82.12%, respectively). Moreover, the samples with silicate minerals (samples A and B) were sensitive to basic and acidic pHs such that their durability is high, moderate, and low in pHs of 7, 8.5, and 4.5, respectively. In comparison, sample C as a carbonate rock loses its durability as acidity declines. Also, it was found that the duration of durability test is more effective when testing the low-durability rocks such as samples A and B compared to durable rocks such as sample C. Finally, long-term evaluation of the durability of the studied samples was successfully done by plotting the observed durability in natural conditions on the diagram of values of disintegration ratio ($ D_{R} $) versus the number of wetting–drying cycles in laboratory scale. In this regard, the $ D_{R} $ values of samples A, B, and C after 2 years were estimated to be 0.18, 0.24, and 0.23, respectively. The estimated values are strongly consistent with the observed slaking behaviors of the samples in the jar slake tests and the observed behaviors under natural conditions.
Investigating the durability of weak rocks to forecast their long-term behaviors
Torabi-Kaveh, Mehdi (author) / Mehrnahad, Hamid (author) / Morshedi, Saeed (author) / Jamshidi, Amin (author)
2021
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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