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Article summary:
1. This study investigated the failure process and evolution mechanisms in circular tunnels under a complex stress path of deep in-situ stress + excavation unloading + stress adjustment.
2. The strength-weakening effect caused by drilling unloading is more apparent under higher initial stress states.
3. Increasing the lateral pressure or initial hydrostatic pressure has a strength-strengthening effect on the surrounding rock.
Article analysis:
The article “Experimental investigation of failure process and characteristics in circular tunnels under different stress states and internal unloading conditions” is an informative and reliable source of information about the failure process and evolution mechanisms in circular tunnels. The authors provide a comprehensive overview of their research, including details about their experimental setup, results, and conclusions. They also cite relevant literature to support their claims, which adds to the trustworthiness of the article.
However, there are some potential biases that should be noted when reading this article. For example, the authors focus mainly on the effects of drilling unloading on the surrounding rock, but do not explore other possible factors that could affect its strength such as temperature or water content. Additionally, they do not discuss any potential risks associated with their experiments or any counterarguments to their findings. Furthermore, while they cite relevant literature to support their claims, they do not present both sides equally; instead they focus mainly on studies that support their own conclusions without exploring alternative perspectives or evidence for opposing views.
In conclusion, this article provides a comprehensive overview of its research topic and cites relevant literature to support its claims; however it does have some potential biases that should be taken into consideration when reading it.