贺兰口岩画附近典型危岩体稳定性分析

通过前期现场调查,分析了贺兰口岩画的主要病害,提出岩画附近的危岩体是其中威胁较大的一类地质病害。根据现场勘察将贺兰口岩画附近不同状态的危岩体分为坠落式、滑塌式和倾倒式三类失稳模式。经过室内试验得到了岩石矿物组成、密度、气孔率、吸水率、单轴抗压强度等物理性质,并且利用Hoek-Brown准则、贯通率法以及岩石表面回弹值估算了危岩体与主控结构面的强度参数,例如单轴抗拉和抗压强度、变形模量、内摩擦角和黏聚力,然后利用不同失稳模式的计算方法进行稳定性分析。结果表明部分危岩体处于不稳定状态中,需要进行加固。

Analysis of typical unstable rocks surrounding the rock art in Helan Valley

Geological investigation revealed that one of the most serious geological threats to rock art in Helan Valley was unstable rocks. The unstable rocks surrounding the rock art in Helan Valley are classified as three types:falling, sliding and toppling, depending on their potential modes of movement. The physical properties of the rocks, such as mineral composition, density, porosity, water absorption ability and uniaxial compressive strength were obtained through laboratory experiments. In addition, the parameters of the rock mass strength and the controlling stractural planes(e.g., uniaxial tensile and compressive strength, deformation modulus, internal friction angle and cohesion) in the Helan Valley were estimated, respectively, by the Hoek-Brown criterion, the linking ratio method and the rock surface rebound values. The stability analysis was performed using different unstable models. The results indicated that some of the rocks are unstable and need to be reinforced.