根据试睑研究和工程实践，探讨预应力锚索加固松散体滑坡的应力响应问理、锚固能力问题、预应力 衰减问题和群锚效应问题,并论述预应力锚索加固破碎带、堆积体和砂砾层滑坡和边坡的应用实例。(根据研 究与实残,采用预应力锚索加固松散层滑坡和边坡的以下机理得以阐述。在松散层和岩层中.应力的传递和 响应规律是相似的。松散层中锚固段的锚固力通过扩孔和二次灌浆也可以是足够的。预应力因松散层压缩蠕变导致的衰减是有限的、可以补偿的。当锚索间距适当时.群锚的效果是正常的。在一些情况下，采用预应力 锚索加固岩层破碎带、崩滑堆积体和砂卵石层的滑坡和边坡.要比采用抗滑桩便宜、髙速和安全.宝成铁路老 鸦岩隧道滑坡是单独采用预应力锚索进行松散体加固的一个实例。对中国银行大楼砂砾层基坑边坡所采用 的预应力锚索加固在成都市是首例,将预应力锚索作为主要加固工程措施之一的南昆铁路八渡堆积层滑坡 是铁路系统治理的最大的滑坡。
Based on the test research and engineering practices on reinforcing the loose bed landslide with prestressed anchoring rope (anchor cable) ,the problems concerned with the stress response ,anchoring force ,exhaustion of prestress force and the group of anchoring ropes are explored.The practi?cal engineering applications of reinforcing the landslide and the slope in rock fracture zone , slump-mass and sandy gravel are also expounded in detail in this paper.
(According to research and practice,the following mechanism on reinforcing loose bed landslide and slope are expounded. The regularity of transmission and response of stress is similar in loose bed and in rock bed. The anchoring force in anchoring section loose bed may be strong enough through ex?panding the aperture and grouting in twice times. Exhaustion of pres tress force with compression creep of loose bed is limited and can be compensated. Effect of a group of anchoring rope is regular,as the in?terval of the rope is suitable.
Under some conditions,the engineering of reinforcing landslide and slope in rock fracture zone,slump- mass and sandy gravel is more cheap,high speed and safe with prestressed anchoring rope than anti?slide pile. The Laoyayan landslide of the Baoji-Chengdu railway is a example in which the reinforced loose bed was applied atone with prestressed anchoring rope. Using prestressed anchoring rope for re?inforcing the excavation wall o{ sandy gravel in building of Bank of China is the first time in Chengdu city. The Badu landslide of Nanning-Kunming railway in slump-mass, a main reinforcing engineering in which the prestressed anchoring rope was applied,is a most big controlled landslide in railways.
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