滑坡锚索框架梁的极限位移分析  

Analysis of maximum displacement of anchor-cable and frame beam against landslide

作　　者：张延磊 倪万魁[2] 李焕焕[2] ZHANG Yanlei;NI Wankui;LI Huanhuan(CCCC First Highway Consultants Co. , LTD. , Xi＇an, Shaanxi 710068, China;Chang＇ an University, School of Geology Engineering and Geomatics, Xi＇an, Shaanxi 710054, China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710068 [2]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《中国地质灾害与防治学报》2017年第4期84-88,94,共6页The Chinese Journal of Geological Hazard and Control

基　　金：省级国有资本经营预算科技创新专项资金项目(2013gykc-018);陕西省交通运输厅2013年度科研项目(13-28K)

摘　　要：为了对滑坡锚索框架梁锚固工程设计提供依据,以前人所做模型试验为基础开展研究工作。首先,基于锚索框架梁的设计理论—Pasternak(巴氏)双参数地基模型,对梁上弯矩与位移的理论表达式进行简化,然后,采用公式拟合的方法,建立了框架位移阈值与最大弯矩、基床系数、剪切模量、混凝土弹性模量、截面宽度和高度、锚索间距、梁长的关系式,从而得到了极限位移表述式,并利用模型试验实例证明了所建极限位移公式的合理性。这样一来,只要确定滑坡相关参数与框架梁的设计参数,就可以计算出框架位移阈值,评价工程安全程度。To optimize design of anchor-cable and frame beam against landslides, the research was carried out based on previous model tests. First, based on the design theory of anchor-cable and frame beam which is Pasternak two-parameter foundation model, theoretical expressions of the moment and displacement were simplified for calculation. Then, by method of fitting the formula, the relation between the displacement threshold of frame beam and maximum moment, coefficient of subgrade, shear modulus, elastic modulus of concrete, width and height of section, anchor spacing and length of beam was established, and the maximum displacement was attained according to the relation, which was proved reasonable by the model test case. In this way, as long as related parameters of the landslide and design parameters of the frame beam were both established, we can calculate the displacement threshold. Combining the displacement threshold with deformation monitoring data of the frame beam, we will achieve the purpose of early warning and forecasting.

关 键 词：锚索框架梁 Pasternak双参数地基模型 最大弯矩 位移阈值 

分 类 号：P694[天文地球—地质学]