不同结构锚索预应力损失差异分析
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摘要
以某坡体采用2 000 kN级的扩孔型和压力分散型锚索对软弱坡体进行加固为例,基于运行初期锚索的预应力损失实测结果,分析了各自的预应力变化规律;通过对两者的对比发现,受内锚固段荷载分布条件改善的影响,压力分散型锚索后期预应力损失更小,在不考虑施工成本和难易的条件下,压力分散型锚索更适合软弱破碎岩体的加固,更易保证岩体的长期稳定性。
Taking the soft rock mass reinforcement of some slope reinforced by pre-stressed anchor cables of 2 000 kN-class expanding borehole and pressure dispersive as an example,we analyze the variation laws of pre-stress loss respectively based on the measured results of prestress loss in earlier operation period.Through comparative analysis of safety monitoring data of two types of cables,it is found that under the influence of improved conditions of loading distribution in anchorage section,pre-stress loss of pressure dispersive pre-stressed cable in later period is smaller,therefore,it is more appropriate for soft rock reinforcement in the condition that construction cost and difficulties are not considered,and it is better for long-term stability of rock mass.
Taking the soft rock mass reinforcement of some slope reinforced by pre-stressed anchor cables of 2 000 kN-class expanding borehole and pressure dispersive as an example,we analyze the variation laws of pre-stress loss respectively based on the measured results of prestress loss in earlier operation period.Through comparative analysis of safety monitoring data of two types of cables,it is found that under the influence of improved conditions of loading distribution in anchorage section,pre-stress loss of pressure dispersive pre-stressed cable in later period is smaller,therefore,it is more appropriate for soft rock reinforcement in the condition that construction cost and difficulties are not considered,and it is better for long-term stability of rock mass.
引文
[1]程良奎,张作眉,杨志银.岩土加固实用技术[M].北京:地震出版社,1994.
[2]程良奎.单孔复合锚固法的机理与实践[C]∥岩土锚固技术的新进展:中国岩土锚固工程协会第九次全国岩土锚固学术研讨会论文集.北京:人民交通出版社,2000.
[3]尤春安,战玉宝.预应力锚索锚固段的应力分布规律及分析[J].岩石力学与工程学报,2005,24(6):925-928.
[4]邬爱清,韩军,罗超文,等.单孔复合型锚杆锚固体应力分布特征研究[J].岩石力学与工程学报,2004,23(2):247-251.
[5]朱晗迓,尚岳全,陆锡铭.锚索预应力长期损失与坡体蠕变耦合分析[J].岩土工程学报,2005,27(4):464-467.
[6]陈安敏,顾金才,沈俊,等.软岩加固中锚索张拉吨位随时间变化规律的模型试验研究[J].岩石力学与工程学报,2002,21(2):251-256.
[7]高大水,曾勇.三峡永久船闸高边坡锚索预应力状态监测分析[J].岩石力学与工程学报,2001,20(5):653-656.
[8]田裕甲.国际荷载分散型锚索构造新进展(二)[J].OVM通讯,2003,5:26-32.
[2]程良奎.单孔复合锚固法的机理与实践[C]∥岩土锚固技术的新进展:中国岩土锚固工程协会第九次全国岩土锚固学术研讨会论文集.北京:人民交通出版社,2000.
[3]尤春安,战玉宝.预应力锚索锚固段的应力分布规律及分析[J].岩石力学与工程学报,2005,24(6):925-928.
[4]邬爱清,韩军,罗超文,等.单孔复合型锚杆锚固体应力分布特征研究[J].岩石力学与工程学报,2004,23(2):247-251.
[5]朱晗迓,尚岳全,陆锡铭.锚索预应力长期损失与坡体蠕变耦合分析[J].岩土工程学报,2005,27(4):464-467.
[6]陈安敏,顾金才,沈俊,等.软岩加固中锚索张拉吨位随时间变化规律的模型试验研究[J].岩石力学与工程学报,2002,21(2):251-256.
[7]高大水,曾勇.三峡永久船闸高边坡锚索预应力状态监测分析[J].岩石力学与工程学报,2001,20(5):653-656.
[8]田裕甲.国际荷载分散型锚索构造新进展(二)[J].OVM通讯,2003,5:26-32.
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