卵石土等效弹性模量理论预测模型初探  

Theoretical model developed for equivalent elastic modulus estimation of cobblestone-soil matrix

作　　者：马辉[1] 高明忠[2] 张建康 余其福 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]四川大学水利水电学院,成都610065 [3]成都市第七建筑工程公司,成都610051 [4]四川兴达建设工程监理有限责任公司,成都610031

出　　处：《岩土力学》2011年第12期3642-3646,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金重大国际合作研究项目(No.50620130440)

摘　　要：卵石土是由卵石和土组成的、处于土和岩体之间的天然地质体,但其宏观力学特性完全不同于土和岩体。通过对成都地铁1号线隧道掘进机(TBM)施工现场调查可知,卵石地层可导致TBM刀具过量磨损、刀盘堵塞等非正常损坏,极大地影响了TBM施工效率,是TBM掘进极其不利的一种典型混合工作面。主要研究卵石土变形性能,建立在均匀应变基础上,假设卵石为理想圆形或椭圆形,从理论上得到卵石土等效弹性模量的解析预测公式。并通过数值试验验证了理论预测模型的有效性。结果表明,此模型预测结果与试验数据比较接近,可用来初步判断卵石地层等效弹性模量,有助于理解并提高该地层中的TBM掘进效率。Cobblestone-soil is a natural geological situation consisting of cobblestones surrounded by soils.The mechanical performance of cobblestone-soil is between soil and rock mass and significant different from any component.Through the investigation in Chengdu Metro Line 1,the geological situation can result in a few non-normal damages（such as cutter wear,jam of roller cutterhead） and affects heavily the TBM performance.It is a typical mixed-face ground,which has an adverse influence on TBM tunnelling.This paper is intended to address the deformation problem of cobblestone-soil.Based on strain uniform assumption,analytic solutions were derived from the theoretical approach for equivalent elastic modulus while the cobblestone is assumed perfect circle and ellipse.The analytic solutions were validated by numerical modelling method.The results indicate that the equivalent elastic modulus derived from theoretical model and numerical is rather closely.The analytic solutions are helpful for improving the understanding of deformation for such ground condition and further to enhance TBM＇s performance.

关 键 词：隧道掘进机 混合面 卵石土 等效弹性模量 

分 类 号：U25[交通运输工程—道路与铁道工程]