Review and prospect of abnormal condition of shaft frozen wall monitoring technique in complex formation condition

In order to early predicting,procedural monitoring and effect evaluate on abnormal condition of shaft frozen wall in complex formation condition,the research progress on technical principle,detection method,and application status of abnormal condition of shaft frozen wall monitoring technique is stated,such as temperature hole observation,hydrological pore observation,lengthwise temperature measurement,ground penetration radar and ultrasonic monitoring technology.Based on the typical cases in auxiliary shaft of Tashidian Coal Mine,the problems of monitoring technique during application process is analyzed,which including:the temperature hole observation can not reflect abnormal temperature values of distant frozen wall accurately.The hydrological pore can not arrange at freezing engineering of accident shaft.Lengthwise temperature measurement have some disadvantages,such as long preparation time,many test member and large calculated deviation of freezing wall opening distance.The future research directions,lengthwise temperature measurement,ultrasonic monitoring technology and monitoring system,are prospected for above problems.Finally,the monitoring system of shaft frozen wall in complex formation condition is put forward.