ABSTRACT
The investigation on the No. 1 cavity of the Longyou Ushiba ancient underground cavern group revealed that the degree of weathering near the bottom surface of the cavity due to the rise of capillary water was severer than that above the bottom surface not affected by the rise of capillary water. At the same time, the humidity increased because of the rise of capillary water, resulting in rapid microbial proliferation, and the effects of a large number of moss, lichens and organisms on the weathering of rocks. Therefore, the measurement positions selected in the present investigation were greater than or equal to 2.0 m above the ground (Fig. 2). According to the survey, it was found that the wall rock at this height produced lots of organisms because of no rise of capillary water, so this paper did not consider the effects of the rise of the capillary water on the wall rock.
