# Research on signal processing of segment-grout defect in tunnel based on impact-echo method

> Research article (Construction and Building Materials, 2018) · cited 38× · AI/ML

**Wikidata**: [openalex:W2887120820](https://www.wikidata.org/wiki/openalex:W2887120820)  
**Source**: https://4ort.xyz/entity/research-on-signal-processing-of-segment-grout-defect-in-tunnel-based-on-impact-echo-method