预应力锚索抗滑桩结构设计优化研究

【作者】 梁永松；

【导师】 刘宏； 孙勇；

【作者基本信息】 贵州大学 ， 地质工程， 2009， 硕士

【副题名】老江底水电站库首左岸滑坡支挡结构设计优化研究

【摘要】 滑坡是一种发生在山区的数量多、规模大、危害严重、性质非常复杂而其发生又具有一定规律性的地质灾害。滑坡产生于特定的工程地质与水文地质环境中,是在以重力为主的自然力作用下或在人类工程活动影响下发生发展的斜坡变形运动。近年来,预应力锚索抗滑桩作为一种新型的支挡结构越来越多地被应用在滑坡治理工程中。由于是一种新型结构,其设计理论和规范都还存在不太成熟的地方,本文结合贵州省黔西南州兴义市境内的老江底水电站库首左岸滑坡支挡工程,分析了预应力锚索抗滑桩受力机理。以工程支挡结构设计和监测数据为基础,对原滑坡治理方案;边坡清理结合抗滑桩,进行了分析,认为方案在坡体腰部削坡减载后,除局部剖面上有剩余下滑推力外,其他地方均没有剩余下滑力,则只需对滑坡体下部设置抗滑桩即可。但在坡体腰部的土石方清除方量太大,需要316.73万元投资,经济上不合理。在对预应力锚索抗滑桩受力机理、滑坡的成因进行分析,并对滑坡推力和锚索拉力进行计算的基础上,引入预应力锚索抗滑桩设计计算的相关理论,采用地基系数法的“K”法和有限杆单元法进行预应力锚索抗滑桩设计计算,并对原方案进行优化。通过计算可知,采用预应力锚索抗滑桩能够承受的弯矩、剪力和岩土侧向应力比下滑力作用下产生的弯矩、剪力和岩土侧向应力要大得多,满足设计要求,可以一次性永久对滑坡进行治理。而进行的投资分析可知,优化后在投资上可以节约大量的资金,做到安全、经济、合理。更多还原

【Abstract】 Land-slide,often taking place in a mountainous area,is a geological disaster with a large quantity and scale.It is very complicated and always has some regularity and often cause severe damages.Usually,land-slides happen in certain engineering circumstance and certain hydro-engineering geology circumstance.It is a kind of slope deformation caused by natural forces,mainly the gravity,or by human protect action.In recent years, prestressed anchor the resistance to slide piles as a new type of support and structures are increasingly being applied to the decline after the project. As a new structure, its design theory and norms are not too mature, the article in the context of Guizhou Xinjiang state in the Old City Yi river hydropower base first floor decline left bank support to projects in the pre anchor slide against the piles of power machine. The project to support structural design and monitoring data on the basis of the original landslides governance programmes; slope slide against the removal of piles, the analysis that the body back slope in the Philippines after reduction, in addition, local profile surplus decline and to other places not remaining decline, the only body with the decline of the Department to resist slide piles. The Singapore Sports waist and clear party is too big, needs 3.1673 million dollar investment, was not reasonable.The anchor of the resistance to slide prestressed piles of opportunities to the decline, the causes for analysis and the decline in the rally and anchor on the basis of calculation, the introduction of a pre anchor slide against the piling design calculations related theory, the Law of the Foundation factor "K" act promptly and limited law prestressed anchor units to resist the slide pile design calculations, and to optimize the original proposal. Through the calculation shows that the pre anchor the resistance to slide piles to bear the moment, shear and geotechnical side stress than downward force of the moment, shear and geotechnical side to stress is much more to meet design requirements, can be a permanent to decline in governance. The investment analysis shows that optimize the investment can save a lot of funds, and ensure security, economic, and reasonable.更多还原