A reasonable unsupported roof distance(URD) when advancing underground coal mine roadways can contribute greatly to safe and rapid roadway development.A mechanical model of the roof,using the relationship between the ...A reasonable unsupported roof distance(URD) when advancing underground coal mine roadways can contribute greatly to safe and rapid roadway development.A mechanical model of the roof,using the relationship between the roof stress distribution and URD,obtained by the difference method,and roof stability according to the in-situ roof stress and rock mass strength was developed.We subsequently designed a proper range of URD,developed a testing method of URD with the function of mining protection,evaluated roof stability through analyzing the test data and then determined a reasonable URD.Considering the factors of the geological conditions,the immediate roof stability and the efficiency of the labor arrangement system,the URD of the advancing roadway of 9802 working face in Zhangshuanglou coal mine was determined to be 6 m using the proposed method.The results show that,when a 2 m length of roadway was reinforced by temporary support and high pre-stressed bolt support after the roadway advancement of 6 m per cycle,the speed and the security of the roadway development can be achieved and the advance rate can reach more than 400 m per month.展开更多
目的:应用筑巢式RT—PCR(RT—nest—PCR)法检测慢性髓细胞性白血病(CML)患者非亲缘异基因骨髓移植(URD)后微小残留病变(MRD),并探讨它与复发的相关性。方法:分别采用RT-nest-PCR法和常规细胞遗传学方法检测bcr／abl融合基因和Ph染色体...目的:应用筑巢式RT—PCR(RT—nest—PCR)法检测慢性髓细胞性白血病(CML)患者非亲缘异基因骨髓移植(URD)后微小残留病变(MRD),并探讨它与复发的相关性。方法:分别采用RT-nest-PCR法和常规细胞遗传学方法检测bcr／abl融合基因和Ph染色体。结果:20例CML行URD患者术前Ph染色体和bcr／abl融合基因检测均为阳性,移植术后30 d Ph染色体皆转为阴性,bcr／abl融合基因完全转阴时间为1～3个月,中位时间2个月;在随防的18例CML患者中,有16例患者bcr／abl融合基因完全转阴后没再转为阳性。在1例复发的CML患者中可见到血型、Ph染色体和bcr／abl融合基因动态变化,另1例CML患者在移植成功后的21个月和36个月检测到bcr／abl融合基因,经随访未见临床和血液学复发征象。结论:检测ber／abl融合基因是目前观察CML患者非亲缘异基因骨髓移植后微小残留病变最敏感的方法之一,非亲缘异基因骨髓移植能最大限度地消除CML患者体内残留病变,患者能长期无病生存。展开更多
基金supported by the State Key Laboratory of Coal Resources and Sate Mining,China University of Mining and Technology (No.SKLCRSM13X07)the National Natural Science Foundation of China (No.51174195)+1 种基金Chinese National Programs for Fundamental Research and Development (No.2013CB227900)the Fundamental Research Funds for the Central Universities (No.2014XT01)
文摘A reasonable unsupported roof distance(URD) when advancing underground coal mine roadways can contribute greatly to safe and rapid roadway development.A mechanical model of the roof,using the relationship between the roof stress distribution and URD,obtained by the difference method,and roof stability according to the in-situ roof stress and rock mass strength was developed.We subsequently designed a proper range of URD,developed a testing method of URD with the function of mining protection,evaluated roof stability through analyzing the test data and then determined a reasonable URD.Considering the factors of the geological conditions,the immediate roof stability and the efficiency of the labor arrangement system,the URD of the advancing roadway of 9802 working face in Zhangshuanglou coal mine was determined to be 6 m using the proposed method.The results show that,when a 2 m length of roadway was reinforced by temporary support and high pre-stressed bolt support after the roadway advancement of 6 m per cycle,the speed and the security of the roadway development can be achieved and the advance rate can reach more than 400 m per month.
文摘目的:应用筑巢式RT—PCR(RT—nest—PCR)法检测慢性髓细胞性白血病(CML)患者非亲缘异基因骨髓移植(URD)后微小残留病变(MRD),并探讨它与复发的相关性。方法:分别采用RT-nest-PCR法和常规细胞遗传学方法检测bcr／abl融合基因和Ph染色体。结果:20例CML行URD患者术前Ph染色体和bcr／abl融合基因检测均为阳性,移植术后30 d Ph染色体皆转为阴性,bcr／abl融合基因完全转阴时间为1～3个月,中位时间2个月;在随防的18例CML患者中,有16例患者bcr／abl融合基因完全转阴后没再转为阳性。在1例复发的CML患者中可见到血型、Ph染色体和bcr／abl融合基因动态变化,另1例CML患者在移植成功后的21个月和36个月检测到bcr／abl融合基因,经随访未见临床和血液学复发征象。结论:检测ber／abl融合基因是目前观察CML患者非亲缘异基因骨髓移植后微小残留病变最敏感的方法之一,非亲缘异基因骨髓移植能最大限度地消除CML患者体内残留病变,患者能长期无病生存。
