ABSTRACT
The AiGong Cave of Longyou located in the central part of Jinqu Basin, QuJiang River north shore, into the Cretaceous series Quxian group (K2q). Formation lithology mainly contains conglomerate, sandstone (including coarse sandstone and sandstone, fine sandstone and siltstone), mudstone, argillaceous siltstone and silty mudstone[6-7]. The red layer of lithology exposed in the Jinqu Basin is relatively complex, but it is more red as the basic color, which mainly include brick red, palm red, light red, purple, brown, reddish brown, etc., and form a medium thick layer, the thick layer, also have a thin layer in each layer[8]. Red layer distribution is controlled by the regional fault zone, the area of broken rock mass structure, hydrologic network development. The problem
1 INTRODUCTION
The AiGong Cave of Longyou Grottoes, which is adjacent to the ancient QuJiang River near the town of ZhongBu and Gubo Rock, with emerald green light friction moment, collectively known as the small stone chamber group, is listed as the national key cultural relics protection unit. According to the research by Mr Zhu Tusheng, who worked in the radio and television news broadcasting industry and culture publication of Longyou, the AiGong Cave was mainly built by Ai Chaodong, a magistrate of Longyou County during the KangXi period (1662∼1722), as literati enjoying the beauty of QuJiang and painting and poetry at that time[1]. The mouth of the AiGong Cave was adjacent to the ancient QuJiang River in the Ming Wanli period. Currently, the front of the cave is filled with nearly 50 meters of argillaceous floodplain topography, combined with the top of the cavity that is nearly nine meters higher above the surface of the flat beach. Nowadays, there are multiple parallel oblique fractures between the mouth of the cave and the central cavity. In addition, there is a factory building nearby at the top of the cavity (horizontal distance about 7 m), whose buckling load may increase the instability of the slope. Thus, factors such as slope landslide, collapse and other geological disasters may occur along the fracture surface.
