Abstract
This work presents the results of an experimental investigation aimed to study the disintegration of carbonaceous mudstone and properties of modified materials. The mineralogical composition of carbonaceous mudstone was determined with X-ray diffraction. The microscopic characteristics of carbonaceous mudstone disintegration were determined with scanning electron microscopy. The surface modification effect of carbonaceous mudstone was researched by comparative tests on coatings’ hydrophobic property, fastness, and waterproof before and after modification, and the modification mechanism of polymer-cement composite modified carbonaceous mudstone was analyzed. The results show that the mineral composition of carbonaceous mudstone mainly contains illite, quartz, and kaolinite. It is found that the disintegration of carbonaceous mudstone can be divided into external factors and internal factors. External factors are water and temperature difference, and internal factors are the swelling of the kaolinite and illite mineral particles. There are differences in the modification effects under different cement dosage. When the cement dosage is 30%, the modification effect is the best. The results may provide a reference for the prevention and control of soft rock slopes.
Highlights
In recent years, with the implementation of China’s “ e Belt and Road” strategy, roads, railways, and other infrastructure in the southwest of China, where carbonaceous mudstone is widely distributed, have developed rapidly
Wong and Wang [7] constructed a threedimensional mathematical model to simulate the expansion of argillaceous rock by considering the three elements of mineral particle expansion, fabric, and stress-induced anisotropy
Scanning electron microscopy and X-ray diffraction have been used to analyze the characteristics of soft rock disintegration
Summary
With the implementation of China’s “ e Belt and Road” strategy, roads, railways, and other infrastructure in the southwest of China, where carbonaceous mudstone is widely distributed, have developed rapidly. Erefore, domestic and foreign scholars have carried out a series of experiments and theoretical studies on soft rock and obtained fruitful research results. Ganesh et al [3] studied the influence of the mineral composition on the disintegration resistance of soft rock. Zhang et al [4] analyzed the influence of swelling rock with drying-wetting cycles on stability of canal slope through laboratory and centrifuge model tests. Some researchers discussed the influence of strain change and number of dry and wet cycles on expansive force based on the expansion test of argillaceous rock [8,9,10]. A mathematical model was established based on the disintegration test, which is used to describe the variation rule of the disintegration index with the increase of the number of dry and wet cycles [15]. Verified by a case study, the results may provide a reference for the prevention and control of soft rock slopes
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