In view of solving the problems of large top coal loss and low recovery rate in the traditional caving process of horizontal section fully mechanized caving mining, taking the fully mechanized caving face of steeply inclined and extra-thick coal seam in Yimen Coal Mine as the engineering background and the research method of numerical simulation and field measurement was used to study the coal gangue flow characteristics under different coal caving directions and different number of coal caving ports at the bottom plate side, revealing the mechanism of top coal loss and proposing the technology to improve the recovery rate. The results show that the action time of top gangue and the ‘ rotation ‘ of coal gangue flow in the triangle coal area jointly promote the release of triangle coal in the bottom plate, which makes the coal gangue interface steeper and the release rate higher when the coal is released in the lateral direction of the bottom plate; adjusting the number of opening coal mouths when the initial coal caving at the floor side can coordinate the top coal caving speed, gangue down-channeling speed and the closing time of the coal caving mouth. When the first coal caving opens two coal caving mouths, the recovery rate of bottom triangular coal is the highest. Yimen Coal Mine adopted the floor lateral roof side caving and double-mouth caving technology. Compared with the original scheme, the top coal recovery rate of the working face increased by 3%, and the top coal recovery rate of the floor triangle area increased by 7%.

Rationale: Gastric-type endocervical adenocarcinoma (GAS) is non-human papillomavirus-associated cervical cancer and the location of the lesions is in the cervical canal mostly.Patient concerns: Vaginal discharge is mistakenly thought to be caused by uterine fibroids. Misdiagnosis leads to disease progression.Diagnoses: Magnetic resonance imaging is an auxiliary tool and pathology is the gold standard for the diagnosis.Interventions: Surgery and supplementary radiotherapy and chemotherapy ± targeted therapy are the main treatment methods.Outcomes: GAS with high malignant degree poor prognosis and insidious development, tends to develop toward the cervical canal and is lack of specific tumor markers, so it is easy to misdiagnosis and missed diagnosis.Lessons: This case highlights the importance of improving the understanding of GAS. And when patients perform vaginal discharge, cervical canal hypertrophy, and cervical cancer screening negative, clinicians ought to be highly alert to GAS.