| 1. | The sides of the pit fell in .
井壁塌了。 |
| 2. | The hole was lined with a steel tube to prevent the walls from falling in .
用一根钢管给钻孔加衬，以防井壁坍塌。 |
| 3. | Study and application of sidewall instability criteria
井壁失稳判断准则及应用分析 |
| 4. | Analysis of borehole collapse cycling time for shale
泥页岩井壁坍塌周期分析 |
| 5. | The sidewall fracture of the shaft and the creep of concrete
井壁破裂与砼的徐变破坏 |
| 6. | Technology procedure for sidewall coring of impact
撞击式井壁取心技术规程 |
| 7. | The mechanism analysis of circular relieving slot on shaft lining
井壁环形卸压槽的作用机理分析 |
| 8. | Analysis of freeze shaft wall damage in dongrong no . 3 coal mine
东荣三矿冻结段井壁破坏原因简析 |
| 9. | Dynamic simulation of the contact between drill stem and well wall
钻柱与井壁接触的动态仿真分析 |
| 10. | Thermal stress analysis of shaft in melting stage of frozen wall
冻结壁融化阶段井壁温度应力研究 |
