TBM盘形滚刀破岩最优贯入度的数值模拟
发布时间：2018-11-04 11:11
【摘要】：为了研究TBM盘形滚刀的破岩效率及其最优贯入度,运用有限元单元理论,采用扩展的Drucker-Prager非线性弹塑性本构模型作为岩石的本构模型,考虑包括单元删除功能的损伤失效准则,对双滚刀切削岩石的过程进行三维动态模拟,研究岩石与刀具相互作用特性。利用回转式切削实验台进行双滚刀破岩实验,验证结果的合理性。研究结果表明:当贯入度为2.0 mm时,2把滚刀的切削力基本相同;当贯入度为10.0 mm时,前把滚刀的切削力大于后把滚刀的切削力;在特定地层下,存在1个最优贯入度,使得滚刀切削比能耗最低;当贯入度为4.3mm时,岩石裂纹能相互交汇,形成完整的碎片,切削比能耗最小;当贯入度小于4.3 mm时,岩石不能产生贯穿裂纹,形成岩脊;当贯入度大于4.3 mm时,岩石过度破碎。
[Abstract]:In order to study the rock breaking efficiency and its optimal penetration of TBM disc hob, the extended Drucker-Prager nonlinear elastoplastic constitutive model is used as the constitutive model of rock by using finite element theory. Considering the damage failure criterion including element deletion function, the dynamic simulation of rock cutting with double hobs is carried out, and the interaction between rock and tool is studied. The rock breaking experiment with double hobs is carried out with rotary cutting test bench to verify the reasonableness of the results. The results show that the cutting force of the two hobs is basically the same when the penetration is 2.0 mm, and the cutting force of the front hob is greater than that of the rear hob when the penetration is 10.0 mm. Under certain strata, there is an optimal penetration degree, which makes the specific energy consumption of hob cutting lowest. When penetration degree is 4.3mm, rock cracks can intersect each other, forming complete fragments, and cutting specific energy consumption is the least. When the penetration is less than 4.3 mm, the rock can not produce a penetrating crack and form a ridge, and when the penetration is greater than 4.3 mm, the rock is over-broken.
【作者单位】： 中南大学机电工程学院;中国铁建重工集团有限公司;
【基金】：国家自然科学基金资助项目(51475478) 国家高新技术发展计划(863计划)项目(2012AA041801) 湖南省战略新兴产业重大科技攻关项目(2012GK4068)~~
【分类号】：U455.31
本文编号：2309649
[Abstract]:In order to study the rock breaking efficiency and its optimal penetration of TBM disc hob, the extended Drucker-Prager nonlinear elastoplastic constitutive model is used as the constitutive model of rock by using finite element theory. Considering the damage failure criterion including element deletion function, the dynamic simulation of rock cutting with double hobs is carried out, and the interaction between rock and tool is studied. The rock breaking experiment with double hobs is carried out with rotary cutting test bench to verify the reasonableness of the results. The results show that the cutting force of the two hobs is basically the same when the penetration is 2.0 mm, and the cutting force of the front hob is greater than that of the rear hob when the penetration is 10.0 mm. Under certain strata, there is an optimal penetration degree, which makes the specific energy consumption of hob cutting lowest. When penetration degree is 4.3mm, rock cracks can intersect each other, forming complete fragments, and cutting specific energy consumption is the least. When the penetration is less than 4.3 mm, the rock can not produce a penetrating crack and form a ridge, and when the penetration is greater than 4.3 mm, the rock is over-broken.
【作者单位】： 中南大学机电工程学院;中国铁建重工集团有限公司;
【基金】：国家自然科学基金资助项目(51475478) 国家高新技术发展计划(863计划)项目(2012AA041801) 湖南省战略新兴产业重大科技攻关项目(2012GK4068)~~
【分类号】：U455.31
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