边坡加固锚索预应力变化规律分析
|
摘要
目前,边坡预应力锚索加固技术已经得到广泛应用,但对锚索锁定后的预应力变化规律还缺乏系统深入的研究,特别是对破碎岩质边坡锚固后,锚索预应力的瞬时损失和长期稳定性还缺乏系统全面的认识。通过对工程边坡锚索预应力变化的系统监测和资料分析,探讨了锚索预应力的锁定损失、短期变化规律、长期变化规律和降雨对锚索有效预应力的影响,揭示了加固破碎岩质边坡的锚索预应力衰减变化的基本规律。
Although cable is widely used in slope engineering,the prestress change rules in cable are not studied thoroughly and systematically yet,especial the prestress loss after lock and the lasting prestress of cable in cracked rock slopes. Based on the systematical monitoring and analysis in a slope reinforcement project,the prestress loss after lock,short-term and long-term prestess change rules are studied,and also the influence of rainfall on the cable prestress state is monitored and discussed. It is found that the prestress loss after lock is largely based upon the shrink of the cable after lock,which is affected by friction to some degree. The short-term and long-term prestress loss is nonlinear,and the prestress loss can be divided into three stages. The influence of rain on the prestress loss should be considered. If the slope is not stable,the rain can affect the stabilization of the slope and then affect the prestress state of cable,otherwise,it has no influence on the prestress state.
Although cable is widely used in slope engineering,the prestress change rules in cable are not studied thoroughly and systematically yet,especial the prestress loss after lock and the lasting prestress of cable in cracked rock slopes. Based on the systematical monitoring and analysis in a slope reinforcement project,the prestress loss after lock,short-term and long-term prestess change rules are studied,and also the influence of rainfall on the cable prestress state is monitored and discussed. It is found that the prestress loss after lock is largely based upon the shrink of the cable after lock,which is affected by friction to some degree. The short-term and long-term prestress loss is nonlinear,and the prestress loss can be divided into three stages. The influence of rain on the prestress loss should be considered. If the slope is not stable,the rain can affect the stabilization of the slope and then affect the prestress state of cable,otherwise,it has no influence on the prestress state.
引文
1顾金才,沈俊,陈安敏等.锚索预应力在岩体内引起的应变状态模型试验研究[J].岩石力学与工程学报,2000,19(增):917～921
2张发明,刘宁,赵维炳.岩质边坡预应力锚固的力学行为及群锚效应[J].岩石力学与工程学报,2000,19(增):1077～1080
3朱杰兵,韩军,程良奎等.三峡永久船闸预应力锚索加固对周边岩体力学性状影响的研究[J].岩石力学与工程学报,2002,21(6):853～857
4丁秀丽,盛谦,韩军等.预应力锚索锚固机理的数值模拟试验研究[J].岩石力学与工程学报,2002,21(7):980～988
5张发明,陈祖煜,刘宁.岩体与锚固体间粘结强度的确定[J].岩土力学,2001,22(4):470～473
6程良奎.岩土加固实用技术[M].北京:地震出版社,1994
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李端友,汤平,李亦明.三峡永久船闸一期工程岩锚预应力监测[J].长江科学院院报,2002,(1):39～42
9邓铁六,王清标,胡建明等.振弦传感技术的新进展及新型锚索测力计[J].岩石力学与工程学报,2001,20(增):1769～1771
10DaiF C,LeeC F.Frequency-volume relation and prediction of rainfall-induced landslides[J].EngineeringGeology,2001,59:253～266
11ChigiraM.Micro-sheeting of granite and its relationship with landsliding specifically after heavy rainstorm inJune1999,HiroshimaPrefecture,Japan[J].EngineeringGeology,2001,59:219～231
2张发明,刘宁,赵维炳.岩质边坡预应力锚固的力学行为及群锚效应[J].岩石力学与工程学报,2000,19(增):1077～1080
3朱杰兵,韩军,程良奎等.三峡永久船闸预应力锚索加固对周边岩体力学性状影响的研究[J].岩石力学与工程学报,2002,21(6):853～857
4丁秀丽,盛谦,韩军等.预应力锚索锚固机理的数值模拟试验研究[J].岩石力学与工程学报,2002,21(7):980～988
5张发明,陈祖煜,刘宁.岩体与锚固体间粘结强度的确定[J].岩土力学,2001,22(4):470～473
6程良奎.岩土加固实用技术[M].北京:地震出版社,1994
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李端友,汤平,李亦明.三峡永久船闸一期工程岩锚预应力监测[J].长江科学院院报,2002,(1):39～42
9邓铁六,王清标,胡建明等.振弦传感技术的新进展及新型锚索测力计[J].岩石力学与工程学报,2001,20(增):1769～1771
10DaiF C,LeeC F.Frequency-volume relation and prediction of rainfall-induced landslides[J].EngineeringGeology,2001,59:253～266
11ChigiraM.Micro-sheeting of granite and its relationship with landsliding specifically after heavy rainstorm inJune1999,HiroshimaPrefecture,Japan[J].EngineeringGeology,2001,59:219～231
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心