沉管复合载体夯扩桩的挤土效应分析

采用弹塑性力学理论中的圆孔扩张理论和球形扩张理论分析载体桩施工过程中桩身和复合载体的挤土效应,确定塑性区的半径。计算结果表明,在复合载体夯扩桩的施工过程中,影响邻桩施工质量的因素是复合载体的施工,而非桩身的成孔影响。根据球形扩张理论,可以大致预估出施工过程中桩间土的隆起。分析为设计提供了一定的参考,并通过实际工程验证了结果的正确性。

Biliary drainage of the common bile duct with an enteral metal stent

In this case report we present an elderly patient who was referred to our hospital with recurrent episodes of cholangitis that persisted after placement of fi ve metal stents for a distal common bile duct(CBD) stenosis.All metal stents were endoscopically removed from the CBD by forceps after balloon dilatation of the papilla.A profoundly dilated CBD with sludge and concrements was seen.To ensure adequate bile drainage an enteral metal stent was inserted in the CBD.This case shows that proximally migrated uncovered metal stents in the CBD can be safely removed endoscopically under certain circumstances.We suggest that in the case of a CBD drainage problem due to an extremely dilated CBD,placement of an enteral metal stent in the CBD could be considered,especially in patients who are unfi t for surgery.

输尿管镜下逆行球囊扩张术对输尿管狭窄的临床治疗效果分析

目的探讨对输尿管狭窄采取输尿管镜下逆行球囊扩张术治疗的效果。方法在来我院就诊的输尿管狭窄患者中选取20例患者作为本次研究对象。对所有输尿管狭窄患者均采取输尿管镜下逆行球囊扩张术治疗,将双"J"管留置1～3个月,术后对患者进行随访,随访时间为3～12个月。结果行输尿管镜下逆行球囊扩张术治疗后,20例输尿管狭窄患者中,有13例患者被治愈,有6例患者病情得到明显改善,有1例患者治疗无效。在治疗过程中所有患者均未出现并发症。结论对输尿管狭窄患者予以输尿管镜下逆行球囊扩张术治疗,将治疗成功率予以提高,具有较高的安全性,在临床上被广泛应用,属于安全可行性技术中的一种。