| 1. | Based on the research progress about shaft wall fracture , some aspects are proposed for further research , including the water level of aquifer , thermal stress , quality of shaft wall , and prediction of dangerous depth of shaft wall fracture in advance , etc
摘要结合目前井壁破裂研究的状况，提出几个值得进一步研究的问题，包括含水层水位、温度应力、井壁质量及井壁破裂位置的超前预测等。 |
