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Bulletin of Engineering Geology and the Environment

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22-10-2018 | Original Paper

In situ failure investigation and time-dependent damage test for columnar jointed basalt at the Baihetan left dam foundation

Authors: Quan Jiang, Bin Wang, Xia-Ting Feng, Qi-Xiang Fan, Zhilin Wang, Shufeng Pei, Shan Jiang

Published in: Bulletin of Engineering Geology and the Environment | Issue 6/2019

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Abstract

Columnar jointed basalt (CJB), characterized by a hexagonal joint network, poses a great challenge for geotechnical designs due to its time-dependent propensity to deformation and damage. In this paper, the geometrical structure and failure modes of CJB exposed on a dam foundation is presented. The study was conducted during the unloading excavation of the Baihetan dam, China, aiming to provide a more in-depth understanding of the CJB damage mechanism. A systematic field test for the columnar jointed rock mass was also carried out on the dam foundation using ultrasonic P wave measurements. It was found that the excavation damage zone of the CJB not only showed time-dependent damage both in depth and degree but also showed spatially inhomogeneous distribution of the damage degree. Sequential regression analysis further demonstrated the time-dependent behavior of the CJB. Successive observations using digital borehole cameras in the field showed that the unloading damage mechanism of the Baihetan CJB was mainly related to the time-dependent opening of the initially closed joints. Several reinforcing methods for improving the stability of the damaged CJB, including the injection of liquid cement and the installation of the prestressed rock bolts, are discussed.

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Title: In situ failure investigation and time-dependent damage test for columnar jointed basalt at the Baihetan left dam foundation
Authors: Quan Jiang
Bin Wang
Xia-Ting Feng
Qi-Xiang Fan
Zhilin Wang
Shufeng Pei
Shan Jiang
Publication date: 22-10-2018
Publisher: Springer Berlin Heidelberg
Published in: Bulletin of Engineering Geology and the Environment / Issue 6/2019
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-018-1399-y

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