Moisture stress effect and its control on differential weathering of red-bed sandstone and conglomerate
TAN Yufang1，2，3，LI Lihui1，2，3，YANG Zhifa1，2，3，LIAO Xiaohui4
(1. Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；
2. Institute of Earth Science，Chinese Academy of Sciences，Beijing 100029，China；
3. College of Earth and Planetary Sciences，University of Chinese Academy of Sciences，Beijing 100049，China；
4. College of Civil Engineering and Architecture，Quzhou University，Quzhou，Zhejiang 324000，China)
Abstract：Many researchers attribute the differential weathering of sandstone and conglomerate to differences in their physical and mechanical properties but pay less attention to external dynamic factors involved in differential weathering. We had a field study on twelve arched rock shelters and one natural arch developed in red-bed basins of Zhejiang province，conducted laboratorial wet-dry test and numerical modelling of moisture movement and moisture stress on sandstone and conglomerate. The failure characteristics of sandstone and conglomerate in wet-dry tests are consistent with the results of field investigation. Sandstone tends to collapse with spherical fractures，while conglomerate generally remains intact except that some gravels at surface drop off from the matrix. The disintegration rate of sandstone is much higher than that of conglomerate. Meanwhile，expansion and shrinkage deformation is 0.15–0.18 mm in sandstone，while 0.001–0.002 mm in conglomerate. The numerical modelling also reveals the mechanism of differential weathering of sandstone and conglomerate. Spherical moisture stress distributes in sandstone during water absorption and causes sandstone flaked like an onion. In contrast，moisture and moisture stress concentrate on the interface between gravel and matrix，and cause gravels dropped off from the matrix. The results reveal that moisture stress is the external dynamic factor controlling the differential weathering between red-bed sandstone and conglomerate
谭玉芳1，2，3，李丽慧1，2，3，杨志法1，2，3，廖小辉4. 红层砂岩与砾岩差异风化的湿度应力效应研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3481-3492.
TAN Yufang1，2，3，LI Lihui1，2，3，YANG Zhifa1，2，3，LIAO Xiaohui4. Moisture stress effect and its control on differential weathering of red-bed sandstone and conglomerate. , 2019, 38(S2): 3481-3492.
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2019, Vol. 38 
