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基于中国矿业大学的新型单层井壁结构,采用物理模拟方法研究了不同厚度、不同井帮温度条件下井壁内温度场发展规律,结果表明,新型单层井壁浇注后,温度迅速上升,井壁越厚,达到的最高温度就越高;专利井壁采用补偿收缩混凝土补偿了部分温差,井壁内外温差虽略微超过规范规定的最大控制温差(25℃),但井壁不会开裂;井壁内部高水化热使得井壁获得至少8d的全断面正温养护时间,井壁无冻害危险;井帮温度不同,相同厚度的井壁达到的最高温度不同;井壁越厚,井帮温度对井壁能达到的最高温度影响越小.利用龙固煤矿实测岩土参数进行的新型单层井壁物理模拟试验结果较好地验证了基于龙固外壁现场实测数据反演得到的水泥水化参数进行数值模拟的结果.
Based on the new single-wall structure of China University of Mining and Technology, the physical simulation method was used to study the development of temperature field in the borehole wall under different thickness and temperature conditions. The results show that the temperature of the new single- The thicker the wall, the higher the maximum temperature reached. The compensated shrinkage concrete compensates some of the temperature difference in the patent well wall. The temperature difference between the inside and outside of the well wall slightly exceeds the maximum control temperature difference (25 ℃) specified in the code, but the well wall will not crack. The high heat of hydration within the wall makes the shaft wall obtain the full cross-section normal temperature curing time of at least 8d, and the borehole wall has no risk of frost damage. The temperature of the wellbore is different and the maximum temperature reached by the same thickness of shaft lining is different. The lower the maximum temperature that can be achieved on the shaft wall.The results of a new single-wall simulation test using the measured geotechnical parameters of Longgu coal mine well validated the cement hydration Parameters of the numerical simulation results.