压力分散型锚索设计中应考虑的几个问题.docxVIP

压力分散型锚索设计中应考虑的几个问题周德培 1，刘世雄 2，刘鸿 1(1. 西南交通大学 土木工程学院，四川 成都 610031 压力分散型锚索设计中应考虑的几个问题 周德培 1，刘世雄 2，刘 鸿 1 (1. 西南交通大学 土木工程学院，四川 成都 610031；2. 重庆建工集团 四川遂资高速公路有限公司，四川 遂宁 629000) 摘要：在分析压力分散型锚索锚固机制的基础上，提出该类锚索设计中应考虑的 3 个问题，即单元锚固段长度的 计算问题、承压板处浆体的变形问题和工后坡体变形引起钢绞线的不均匀荷载问题，认为该类锚索较拉力型锚索 的锚固力有所提高，是因为浆体受压时径向的膨胀变形受到岩土体约束，岩土体越坚硬约束作用越强，锚固力提 高值越多，反之则小。由此提出物理概念清楚、计算简单的单元锚固段长度计算公式。按照承压板处浆体的变形 特征，提出变形量的计算公式，由此可进行浆体的变形验算。为消除工后坡体变形引起钢绞线的荷载不均匀问题， 建议采用基于工后允许位移的张拉法，给出详细张拉顺序和计算公式。 关键词：岩土工程；压力分散型锚索；浆体变形；锚固段长度；工后变形 中图分类号：TU 4 文献标识码：A 文章编号：1000–6915(2013)08–1513–07 SOME PROBLEMS TO BE CONSIDERED IN DESIGN FOR COMPRESSION DISPERSION-TYPE ANCHOR CABLES ZHOU Depei1，LIU Shixiong2，LIU Hong1 (1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. Sichuan Suining-Ziyang Expressway Co.，Ltd.，Chongqing Construction Engineering Group，Suining，Sichuan 629000，China) Abstract：On the analysis of anchoring mechanism for compression dispersion-type anchor cable，three problems that should be considered in the anchor cable design have been put forward，namely the calculation of unit anchor length，the deformation of grouting body near pressure plate and the nonuniform loads of steel strand wires caused by the rock mass deformation after slope completed. The anchorage force has been improved to compare with tension type anchor cable ，because the radial expansion deformation of grouting body is restrained by the rock mass. The hard the rock mass is ，the stronger the restriction is ；and the more the improved anchorage force ， otherwise ，the smaller. A formula for calculating anchoring length ，of which the physical concept is clear and calculation simple，is presented，together with the formula to determine the deformation of the grouting body near pressure plate. In order to eliminate the nonuniform loads，the anchor cable tension method is recommended，in which rock mass permitted displacement after slope completed is considered；and the detailed tension order and the calculation formula