粉质粘土层冻结温度场-声场耦合数值模拟及实测研究
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摘要
为了研究不同冻结阶段超声波声学信号的响应特征,采用COMSOL软件固体传热和压力声学模块,提出了热-声单向耦合数值模拟方法。获得了不同冻结阶段两冻结孔之间的温度场演化特征及超声波声学参数变化规律。结果表明:与冻结90d相比,冻结25d、40d、42d的声压分别衰减51. 83%、51. 48%、10. 29%;冻结壁交圈峰值声压比未交圈峰值声压增大了45. 91%;随着冻结时间增长(25d、40d、42d、90d),超声波平均声速分别为2088m/s、2379m/s、2670m/s、2885m/s。根据现场检测结果可知,该耦合方法模拟值与实测值误差在5%以内,可作为预测不同冻结阶段冻结壁超声波声学参数的有效手段。
In order to study the response characteristics of ultrasonic acoustic signals in different freezing stages,a thermoacoustic unidirectional coupling numerical simulation method was proposed using COMSOL software solid heat transfer and pressure acoustic module. The temperature field evolution characteristics and the variation of ultrasonic acoustic parameters between the two freezing holes in different freezing stages were obtained. The results are as follows: the reduction of 25 d,40 d and 42 d sound pressure are 51. 83%,51. 48% and 10. 29% respectively than 90 d; the peak sound pressure of the frozen wall intersection is 45. 91% higher than the peak sound pressure of the uncrossed circle; ultrasonic average velocity are 2088 m/s,2379 m/s,2670 m/s and 2885 m/s respectively increase with freezing time(25 d、40 d、42 d、90 d). According to the on-site test results,the measured value of the field and the simulated value are within 5%,which prove this numerical simulation method can be an effective method to forecast acoustic parameters of freezing wall at different stages.
In order to study the response characteristics of ultrasonic acoustic signals in different freezing stages,a thermoacoustic unidirectional coupling numerical simulation method was proposed using COMSOL software solid heat transfer and pressure acoustic module. The temperature field evolution characteristics and the variation of ultrasonic acoustic parameters between the two freezing holes in different freezing stages were obtained. The results are as follows: the reduction of 25 d,40 d and 42 d sound pressure are 51. 83%,51. 48% and 10. 29% respectively than 90 d; the peak sound pressure of the frozen wall intersection is 45. 91% higher than the peak sound pressure of the uncrossed circle; ultrasonic average velocity are 2088 m/s,2379 m/s,2670 m/s and 2885 m/s respectively increase with freezing time(25 d、40 d、42 d、90 d). According to the on-site test results,the measured value of the field and the simulated value are within 5%,which prove this numerical simulation method can be an effective method to forecast acoustic parameters of freezing wall at different stages.
引文
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[2]叶玉西.冻结器内纵向测温判定冻结壁出水位置技术[J].煤炭科学技术,2015(3):13-16.
[3]黄星,李东庆,明锋,等.冻结粉质黏土声学特性与物理力学性质试验研究[J].岩石力学与工程学报,2015,34(7):1489-1496.
[4]杨平,李强.冻土力学性能与声波参数相关性试验研究[J].岩土工程学报,1997,19(4):78-82.
[5]王大雁,朱元林,马巍,等.冻土超声波波速与冻土物理力学性质试验研究[J].岩石力学与工程学报,2003,22(11):1837-1840.
[6]辛林,程卫民,谢军,等.岩石单向加热热固耦合数值模拟研究[J].煤炭科学技术,2018,46(7):145-151.
[7]成联柄.基桩声波透射法完整性检测的声场分布规律及数值模拟研究[D].重庆:重庆大学,2016.
[8]甘甜,仵杰,邢德键.基于COMSOL带腐蚀凹陷套管井的声场数值模拟[J].电声技术, 2017, 41(4-5):111-114.
[9]李博融,杨更社,奚家米,等.白垩系井筒冻结壁温度场数值分析研究[J].煤炭工程,2015,47(4):11-14.
[10]侯运炳,贾进峰,赵易鑫,等.大断面斜井冻结施工多排管冻结温度场模拟研究[J].煤炭工程,2012,44(12):77-80.
[11]刘波,陈玉超,李东阳,等.冻结管差异温度强化冻结试验与数值分析[J].煤炭工程,2014,46(5):97-99.
[12]姜国静,李昆,王建平,等.西部软岩冻结井筒砌筑外壁对冻结壁温度场影响研究[J].煤炭工程,2015,47(8):41-43.
[13]杨更社,荣腾龙,奚家米,等.煤矿立井冻结壁温度场演化规律数值模拟分析[J].地下空间与工程学报,2016,12(2):420-425.