摘要
摘要基于等效塑性应变的岩土破坏准则和岩土弹塑性本构关系，考虑扩孔器在施工过程中与岩土的接触碰撞问题，采用有限单元法建立扩孔器与岩土相互作用系统非线性动力学模型，对水平定向钻穿越扩孔施工过程进行数值模拟，研究了扩孔器的动态变化规律及其对扩孔形状的影响。结果表明，在扩孔过程中，扩孔器会产生沉降，沉降量与钻进速度和扩孔时间有关，钻进速度越大扩孔器沉降量越大，扩孔时间越长扩孔器沉降量越大；同时，扩孔器在竖直方向会产生振动，振动速度的变化范围为-380～320mm／s。受扩孔器沉降等因素的影响，模拟得到的扩孔截面形状为上窄下宽的长圆形，与工程实例的扩孔形状吻合。
Based on the geotechnical failure criteria of the equivalent plastic strain and the geotechnical elastic-plastic constitutive relation, the random collision under gravity and the geotechnical interaction are considered to establish a nonlinear dynamics model of the interaetion between the reamer and the geotechnical body, which is used in the finite element method. The horizontal directional drilling construction process is simulated when the reamer operates. The reamer produces a settlement in its operation, the settlement of the reamer increases with the construction time, the speed in the vertical direction changes in a range of-380-320 mm/s. The sedimentation rate increases with the reamer＇ s drilling speed. The actual cross-section of the pertorations is pear-shaped, as is the case in engineering examples.
出处
《科技导报》
CAS
CSCD
北大核心
2014年第16期54-57,共4页
Science & Technology Review
基金
中国石油天然气集团公司"十二五"科技项目(2011B-3303)
