Boreability of Strata by Shield Construction and Case Analysis of Its Application in Machine-geotechnical State Recognition

DOI：

 作者 单位 张沛然1，杨果林1?覮，吕涛2，陈亚军2，邱明明3 （1. 中南大学 土木工程学院，湖南 长沙 410075；2. 中建五局土木工程有限公司，湖南 长沙 410004； 3. 延安大学 建筑工程学院，陕西 延安 716000）

基于可钻性原理，对现有盾构施工地层的可掘性概念、意义及关键问题进行了梳理，总结提出了表示可掘性的位移法、强度法和能量法，并初步优选了其代表性指标-贯入度，场切入指数和掘进比能. 结合某盾构隧道工程，对掘进过程中盾构的施工参数及可掘性指标变化规律进行了时程分析，提出了盾构掘进工作的4个主要阶段. 分别从单环掘进的不同工作阶段、三类地层条件的施工统计数据和相关文献研究结果三个方面分析了可掘性指标间的相关性，发现贯入度、场切入指数和掘进比能间具有较好的统一性，可作为表示盾构施工地层可掘性的代表性指标. 辅以工程中出现的特殊地层，对可掘性指标响应反馈机-岩状态的可行性进行了案例剖析. 最后，对可掘性问题研究进行了思考，认为盾构施工地层的分类研究应侧重岩土主要物理力学参数与可掘性指标间的统计工作，加快推进传统地勘向基于可掘性的钻探方法技术发展.

Based on the principle of drillability，the concept，significance and key issues of boreability of strata by shield construction are combed. The displacement method，the strength method and the energy method are put forward to express the boreability，and the representative indexes of three methods are preliminarily selected as: penetration，field penetration index and specific energy. Combined with a shield tunnel project，the time history analysis on the change rule of construction parameters and boreability index of shield tunneling is carried out，and four main working stages of tunneling are put forward. Based on the different working stages of single ring driving，statistical data of three kinds of stratum and the results of relevant literature，the correlation between the boreability indexes is analyzed. There is a good unity among penetration，field penetration index and specific energy，which can be used to express the boreability of the stratum. Supplemented by the special stratum in the project，the feasibility of the response feedback between boreability and shield machine-geotechnical state is analyzed. At last，the study on the problem of boreability is considered. It is suggested that the study on the classification of strata should focus on the statistical work between the main physical mechanical parameters and the boreability index of the geotechnical，and accelerate the development of traditional geological exploration to drilling methods based boreability.