盾构切削含塑料排水板淤泥土层刀具选型及参数优化研究  

Study on Type Selection and Parameter Optimization of the Shield Cutters Used for Cutting Sludge Stratum Containing Prefabricated Vertical Drains

作　　者：王大海 胡艳峰 WANG Dahai;HU Yanfeng(Rail Transit Branch of China Communications Construction,Beijing 100010;CFHEC Xiamen Engineering Co.,Ltd,Xiamen 361021)

机构地区：[1]中国交建轨道交通分公司,北京100010 [2]中交一公局厦门工程有限公司,厦门361021

出　　处：《现代隧道技术》2023年第3期74-80,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金(41972276);福建省杰出青年科学基金项目(2020J06013).

摘　　要：塑料排水板广泛应用于加固软土地基的同时,其韧性好、耐腐蚀、不易降解的特性也为后续该地层中的盾构施工带来极大困扰。针对这一难题,采用ABAQUS有限元分析软件,构建了不同刀具切削塑料排水板加固淤泥地层的仿真模型,从切削力大小及其变化特征等方面对比不同刀具的切削效果,分析得出刀具宽度、刃口高度、切削速度和刀具贯入度等因素对利刃撕裂刀切削力的影响。研究表明:刮刀适用于淤泥地层,利刃撕裂刀更适用于切削塑料排水板,且利刃撕裂刀宽度不能小于50 mm,常规宽度70 mm可满足施工要求;刃口高度应选用40 mm或50 mm;刀盘转速越大,切削效果越好,且速度不应低于400 mm/s;应严格控制刀具贯入度,避免造成刀具因受力过大或不稳而损坏。针对含塑料排水板的淤泥土层,采用利刃撕裂刀及刮刀的组合刀具,利于盾构掘进。The prefabricated vertical drains are widely used for reinforcing soft soil foundation,but its high toughness,corrosion resistance and non-degradability can be very bothering to later shield tunnelling in the stratum.To solve this problem,the simulation model for different cutters that are used to cut the sludge stratum reinforced by prefabricated vertical drains has been created by using the ABAQUS finite element analysis software,and the cutting results of different cutters have been compared from the aspects such as cutting force and variation characteristics.The analysis reveals how the cutting force of sharp-edged tearing cutter will be affected by the factors including cutter width,cutting edge height,cutting speed and cutter penetration.The study shows that the scraper is suitable for sludge stratum,while the sharp-edged tearing cutter is suitable for cutting prefabricated vertical drain and the width of the sharp-edged tearing cutter should not be less than 50 mm,but the regular 70 mm width will meet the construction requirements;the cutting edge height should preferably be 40 mm or 50 mm;the faster the cutterhead rotates,the better the cutting performance,and the rotating speed should not be less than 400 mm/s;the cutter penetration must be strictly controlled,to protect the cutter from damage caused by excessive or unstable force.For the sludge stratum containing prefabricated vertical drains,the combined cutters composed of sharp-edged tearing cutter and scraper is helpful for shield tunnelling.

关 键 词：塑料排水板 淤泥地层 刀具选型 ABAQUS 切削力 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]