Resource
Surrounding Rock Loosening Zone Detection – Mengdigou Hydropower Station, Yalong River Basin
Release time:
2025-09-29 09:11
Project Overview
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Project Name: Mengdigou Hydropower Station
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Project Type: Hydropower Engineering
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Location: Yalong River main stream at the border of Ganzi Prefecture and Liangshan Prefecture, Sichuan Province, China. The reservoir area involves Jiulong County, Kangding City, and Yajiang County in Ganzi Prefecture, as well as Muli County in Liangshan Prefecture
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Testing Equipment: RSM-SY6(C) Ultrasonic Tester
Testing Purpose & Method
The purpose of the monitoring program was to assess the loosening zone of surrounding rock during construction. The ultrasonic testing method was applied to evaluate stability conditions in critical underground structures, including the traffic tunnel, water diversion tunnel, and spillway tunnel.
Testing Scope
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Monitoring of loosening range of surrounding rock in key tunnel sections
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Verification of rock mass stability against design expectations
Testing Results
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Loosening Range: 0–1.1 m
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Abnormalities: None; rock mass remained within design limits
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Impact on Project: No adverse effects observed
Evaluation
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Overall Engineering Evaluation: The detected loosening depth matched design expectations, confirming the stability of the surrounding rock mass.
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Equipment Performance: The RSM-SY6(C) operated effectively, though some probe signal instability was observed (signal fluctuation when fixed at depth). The gasbag sealing method was tested but proved relatively slow. Despite this, test accuracy remained sufficient for reliable engineering evaluation.
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