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花岗岩在我国东南沿海地区分布广泛。中等风化花岗岩具有承载力高,稳定性好,抗震性强等特点,可作为大型LNG储罐的地基持力层,但由于原始地貌、构造、差异风化等多种因素,花岗岩基岩面往往参差不齐。本文以某LNG储罐为例,利用三维地质建模手段,建立了罐区中等风化花岗岩岩面地质模型,直观反映了中等风化花岗岩岩面的起伏,在三维地质模型的基础上,结合罐区地层接触关系以及区域地质调查,对罐区花岗岩风化模式进行了研究。研究表明,罐区花岗岩风化作用以化学风化为主,在花岗岩节理发育密集部位,风化作用强,节理稀疏部位风化作用弱,风化作用强度的差异形成了厚度不均的风化壳,从而导致了风化壳下岩面的起伏。
Granite in China’s southeast coastal areas are widely distributed. Medium weathered granite has the characteristics of high bearing capacity, good stability and strong earthquake resistance, which can be used as the foundation bearing layer of large LNG storage tanks. However, the bedrock surface of granite often varies due to many factors such as the original landform, the structure and the difference weathering. Misaligned. Taking a certain LNG storage tank as an example, the geologic model of middle weathered granite rock face in tank farm area is established by means of three-dimensional geologic modeling, which directly reflects the undulation of medium weathered granite rock face. Based on the three-dimensional geological model, Stratigraphic contact and regional geological survey, we studied the weathering pattern of granite in tank area. The results show that weathering of granite in tank area is dominated by chemical weathering. Weathered areas with uneven thickness are formed by the weathering of weakly knotted joints and intensive weathered parts of granite joints, resulting in weathering Rock under the rock surface.