In recent years,highway,especially expressway is under rapid construction throughout the world.The Infl uence of moisture content on coupling mechanical properties of plant fi ber-rope slope soil interface was studied...In recent years,highway,especially expressway is under rapid construction throughout the world.The Infl uence of moisture content on coupling mechanical properties of plant fi ber-rope slope soil interface was studied by using self-made tensile equipment through mechanical experiments on plant fi berreinforced&slope soil.The study mainly involved 2 groups of experiments,the mechanical properties of slope soil with structural damages were experimented in the experiments of Group I;the mechanical properties of slope soil with structural retention were experimented in the experiments of Group II.The results showed that coupling mechanical properties between the plant fi ber and slope soil in the experiments of Group I were signifi cantly infl uenced by the moisture content,and the tensile strength of the plant fi ber decreased linearly with the increase in the moisture content,the infl uence of the moisture content on the friction angle was insignifi cant,and the cohesive force decreased exponentially with the increase in the moisture content.The coupling mechanical properties of plant fi ber and slope soil in the experiments of Group II were also signifi cantly infl uenced by the moisture content,and the peak strength and residual strength of the plant fi ber and slope soil decreased exponentially with the increase in the moisture content.展开更多
Based on the current lack of ecological functional evaluation framework for highway ecological restoration engineering,this study comprehensively considered the negative impact of the highway engineering on the area a...Based on the current lack of ecological functional evaluation framework for highway ecological restoration engineering,this study comprehensively considered the negative impact of the highway engineering on the area along the highway under the guidance of restoration ecology,and the improvement and promotion of artificially constructed plant community to the highway ecology environment after restoration.With the ecological restoration function of artificially constructed plant community as the research emphasis,the landscape effect of the highway ecosystem and the key position of the ecosystem service function level in the assessment of ecological restoration effect were highlighted,and a relatively complete and targeted highway ecological restoration effect evaluation system was established.On this basis,this study selected the artificially constructed plant system in a highway ecological restoration project for research,and started with the ecological restoration effect evaluation of four types of ecological restoration objects,and comprehensively evaluated its ecological restoration effect according to the constructed evaluation system.The study found that although the highway ecological restoration engineering had certain effects in improving the plant community level and the ecosystem landscape level,there were still some problems in improving the ecosystem service function level in the short term.Therefore,in the future construction of highway engineering,it is suggested to take the protection and avoidance countmeasures as far as possible in line with the principle of "ecological benefits",in order to avoid strong disturbances to the highway ecosystem and realize the aim of "ecological highways" in the true sense.展开更多
目的探讨加长柄半髋关节置换术治疗高龄伴严重骨质疏松不稳定型股骨粗隆间骨折的临床效果。方法回顾性分析2017年4月至2019年4月聊城市人民医院48例高龄伴严重骨质疏松不稳定型股骨粗隆间骨折患者,23例采用加长柄半髋关节置换术(long-st...目的探讨加长柄半髋关节置换术治疗高龄伴严重骨质疏松不稳定型股骨粗隆间骨折的临床效果。方法回顾性分析2017年4月至2019年4月聊城市人民医院48例高龄伴严重骨质疏松不稳定型股骨粗隆间骨折患者,23例采用加长柄半髋关节置换术(long-stem hemiarthroplasty,LHA)治疗(LHA组),25例采用股骨近端防旋髓内钉(proximal femoral nail anti-rotation,PFNA)治疗(PFNA组)。将PFNA组作为对照组,通过比较两组患者手术时间,术中出血量,围手术期输血量,术中透视次数,术后下地负重时间,术后并发症发生率,住院时间及术后1、3、6、12个月复查时的Harris髋关节功能评分,探讨应用加长柄半髋关节置换术治疗高龄伴严重骨质疏松不稳定型股骨粗隆间骨折的效果评价。结果LHA组23例患者随访时间范围12.0~26.0个月,随访时间(18.6±3.9)个月;PFNA组25例患者随访时间范围12.0~24.0,随访时间(17.8±3.3)个月,两组随访时间比较差异无统计学意义(t=0.552,P=0.581)。LHA组患者手术时间[60(55,73)h]长于PFNA组[55(50,60)h],LHA组患者术中出血量[(179.35±63.47)mL]多于PFNA组[(122.80±49.03)mL],LHA组患者术中透视次数[2(2,2)次]少于PFNA组[16(15,20)次],LHA组患者开始下地负重时间[4(3,5)d]早于PFNA组[33(30,36)d],差异均有统计学意义(Z=2.459、t=3.470、Z=6.216、Z=5.959;P均<0.05)。两组患者围手术期输血量、住院时间、术后并发症发生率比较差异均无统计学意义(P均>0.05)。Harris髋关节功能评分术后1、3、6、12个月在LHA组[(76.70±5.96)、(82.13±6.38)、(85.96±7.16)、(88.78±7.67)分]和PFNA组[(63.80±3.46)、(71.56±2.55)、(81.60±3.38)、(88.08±4.83)分]均随着随访时间增长逐渐升高(F组内=432.557,P组内<0.001),术后12个月时评分达到最高。LHA组患者Harris髋关节功能评分高于PFNA组,差异有统计学意义(F组间=25.437,P组间<0.001)。随访时间点与手术方式之间存在交互效应(F交互=53.464,P交互<0.001)。结论对于高龄伴有重度骨质疏松的不稳定型股骨粗隆间骨折患者,选择应用加长柄半髋关节置换的手术方式,可早期下床负重,减少卧床并发症,减少术中透视次数,能更早且更好的恢复髋关节功能,效果满意。展开更多
文摘In recent years,highway,especially expressway is under rapid construction throughout the world.The Infl uence of moisture content on coupling mechanical properties of plant fi ber-rope slope soil interface was studied by using self-made tensile equipment through mechanical experiments on plant fi berreinforced&slope soil.The study mainly involved 2 groups of experiments,the mechanical properties of slope soil with structural damages were experimented in the experiments of Group I;the mechanical properties of slope soil with structural retention were experimented in the experiments of Group II.The results showed that coupling mechanical properties between the plant fi ber and slope soil in the experiments of Group I were signifi cantly infl uenced by the moisture content,and the tensile strength of the plant fi ber decreased linearly with the increase in the moisture content,the infl uence of the moisture content on the friction angle was insignifi cant,and the cohesive force decreased exponentially with the increase in the moisture content.The coupling mechanical properties of plant fi ber and slope soil in the experiments of Group II were also signifi cantly infl uenced by the moisture content,and the peak strength and residual strength of the plant fi ber and slope soil decreased exponentially with the increase in the moisture content.
文摘Based on the current lack of ecological functional evaluation framework for highway ecological restoration engineering,this study comprehensively considered the negative impact of the highway engineering on the area along the highway under the guidance of restoration ecology,and the improvement and promotion of artificially constructed plant community to the highway ecology environment after restoration.With the ecological restoration function of artificially constructed plant community as the research emphasis,the landscape effect of the highway ecosystem and the key position of the ecosystem service function level in the assessment of ecological restoration effect were highlighted,and a relatively complete and targeted highway ecological restoration effect evaluation system was established.On this basis,this study selected the artificially constructed plant system in a highway ecological restoration project for research,and started with the ecological restoration effect evaluation of four types of ecological restoration objects,and comprehensively evaluated its ecological restoration effect according to the constructed evaluation system.The study found that although the highway ecological restoration engineering had certain effects in improving the plant community level and the ecosystem landscape level,there were still some problems in improving the ecosystem service function level in the short term.Therefore,in the future construction of highway engineering,it is suggested to take the protection and avoidance countmeasures as far as possible in line with the principle of "ecological benefits",in order to avoid strong disturbances to the highway ecosystem and realize the aim of "ecological highways" in the true sense.
文摘目的探讨加长柄半髋关节置换术治疗高龄伴严重骨质疏松不稳定型股骨粗隆间骨折的临床效果。方法回顾性分析2017年4月至2019年4月聊城市人民医院48例高龄伴严重骨质疏松不稳定型股骨粗隆间骨折患者,23例采用加长柄半髋关节置换术(long-stem hemiarthroplasty,LHA)治疗(LHA组),25例采用股骨近端防旋髓内钉(proximal femoral nail anti-rotation,PFNA)治疗(PFNA组)。将PFNA组作为对照组,通过比较两组患者手术时间,术中出血量,围手术期输血量,术中透视次数,术后下地负重时间,术后并发症发生率,住院时间及术后1、3、6、12个月复查时的Harris髋关节功能评分,探讨应用加长柄半髋关节置换术治疗高龄伴严重骨质疏松不稳定型股骨粗隆间骨折的效果评价。结果LHA组23例患者随访时间范围12.0~26.0个月,随访时间(18.6±3.9)个月;PFNA组25例患者随访时间范围12.0~24.0,随访时间(17.8±3.3)个月,两组随访时间比较差异无统计学意义(t=0.552,P=0.581)。LHA组患者手术时间[60(55,73)h]长于PFNA组[55(50,60)h],LHA组患者术中出血量[(179.35±63.47)mL]多于PFNA组[(122.80±49.03)mL],LHA组患者术中透视次数[2(2,2)次]少于PFNA组[16(15,20)次],LHA组患者开始下地负重时间[4(3,5)d]早于PFNA组[33(30,36)d],差异均有统计学意义(Z=2.459、t=3.470、Z=6.216、Z=5.959;P均<0.05)。两组患者围手术期输血量、住院时间、术后并发症发生率比较差异均无统计学意义(P均>0.05)。Harris髋关节功能评分术后1、3、6、12个月在LHA组[(76.70±5.96)、(82.13±6.38)、(85.96±7.16)、(88.78±7.67)分]和PFNA组[(63.80±3.46)、(71.56±2.55)、(81.60±3.38)、(88.08±4.83)分]均随着随访时间增长逐渐升高(F组内=432.557,P组内<0.001),术后12个月时评分达到最高。LHA组患者Harris髋关节功能评分高于PFNA组,差异有统计学意义(F组间=25.437,P组间<0.001)。随访时间点与手术方式之间存在交互效应(F交互=53.464,P交互<0.001)。结论对于高龄伴有重度骨质疏松的不稳定型股骨粗隆间骨折患者,选择应用加长柄半髋关节置换的手术方式,可早期下床负重,减少卧床并发症,减少术中透视次数,能更早且更好的恢复髋关节功能,效果满意。
