巴图拉佩组火山岩的风化作用及其对Pamukkulu大坝地基规划的启示

H. Pachri, R. Husain, A. Tonggiroh, M. Yusril
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摘要

Pamukkulu地区风化火山岩的存在对确定Pamukkulu主坝和地基结构的位置和施工具有重要意义。总的来说,由于不同程度的风化、地下水的影响以及熔岩冷却产生的系统节理,火山岩的岩土力学特征较差。本研究旨在研究主坝及坝基周围风化岩的类型和质量。首先,进行地表地质填图。为了评价风化程度,采用了主坝周围的岩石电阻率数据。而对于地基区域,则采用板承试验(PBT)和标准贯入试验(SPT)对土/岩的承载力进行评估。在岩石表面进行PBT测试得到的承载能力可以用来解释岩石的风化。除了SPT,岩石钻井取心也使用岩石质量标识(RQD)进行评估。发现20米深以下的岩石质量较差。建议将质量差的岩石移除,直到找到中等致密的岩层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Weathering of Volcanic Rocks in Baturappe Formation and Its Implications for Foundation Planning of Pamukkulu Dam, South Sulawesi, Indonesia
The presence of weathered volcanic rocks in Pamukkulu area is important in determining the location and construction of the Pamukkulu main dam and plinth structure. In general, volcanic rocks have poor geotechnical characteristics due to varying degree of weathering, influence of groundwater, and systematic joints produced by cooling lava. This study aims to study the type and quality of weathered rock around the main dam and plinth area. First, mapping of surface geology was carried out. To evaluate the degree of weathering, rock resistivity data is used around the main dam area. Whereas for the plinth area, the bearing capacity of soil/rock is evaluated using Plate Bearing Test (PBT) and Standard Penetration Test (SPT). Bearing capacity obtained from PBT that were carried out on rock surface can be used to interpret rock weathering. In addition to SPT, the coring from rock drilling was also evaluated using Rock Quality Designation (RQD). It was found that the rock up to 20 m depth are of poor quality. It is recommended that the poor-quality rock is removed until moderately dense rock layer is found.
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