复杂地层井筒冻结壁异常状况监测技术研究现状与展望

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

为了实现对复杂地层条件下井筒整体冻结壁异常状况的早期预报、过程监测、效果评价,综述了测温孔观测、水文孔观测、冻结器内纵向测温、地质雷达技术、超声波监测技术等在技术原理、检测方法、应用现状等方面的进展。以新疆塔什店煤矿副井冻结工程为典型案例,分析出目前井筒冻结壁异常状况监测技术在应用过程中存在的主要问题包括:测温孔受限于布置位置,无法准确反映远距离冻结壁局部温度异常情况;水文孔在事故井筒冻结工程当中无法布置;纵向测温法具有停冻准备时间长,测试人员多,冻结壁开窗距离推算结果偏差较大等缺点。针对此,对纵向测温监测技术、超声波监测技术、冻结壁异常状况监测体系等方面的研究方向进行了展望,提出了复杂地层条件下井筒冻结壁异常状况监测体系构思。

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.