Displacement measurement techniques and numerical verification in 3D geomechanical model tests of an underground cavern group
Displacement measurement techniques and numerical verification in 3D geomechanical model tests of an underground cavern group
复制标题
地下洞室群三维地质力学模型试验位移测量技术及数值验证
DOI：
10.1016/j.tust.2016.01.029
复制
发表时间：
2016-06
影响因子：
6.9
通讯作者：
W. S. Zhu
中科院分区：
文献类型：
--
作者：
Q. B. Zhang;L. He;W. S. Zhu
本文以大型三维地质力学模型试验和数值模拟为基础，对地下洞室群的稳定性进行了研究。开发了多种测量技术来测量洞室变形的收敛性、侧壁关键点的位移和开挖模拟过程中的损伤模式。采用数字摄影测量技术和基于光纤光栅的位移传感杆对围岩进行位移测量。研制了高精度光栅刻度的微型多点位移计，作为位移监测的传感器。随后，采用基于节点的非连续变形分析（NDDA）方法对物理模型试验全过程进行了模拟，并与实验结果进行了对比。得到了各开挖阶段围岩和侧壁关键部位位移的变化过程和规律曲线。研究表明，将围岩位移测量方法应用于真三维应力状态下的洞室群大型模型试验取得了满意的效果。
In this paper, the stability of an underground cavern group is investigated on the basis of large-scale 3D geomechanical model tests and numerical simulations. Multiple measurement techniques are developed to measure the convergence of deformation in the cavern, displacements at key points in the side walls and the damage pattern during the excavation simulation process. The digital photogrammetric technique and fiber Bragg grating (FBG) based displacement sensing bars are applied to measure displacements in the surrounding rock masses. Mini multi-point extensometers with high-precision grating scales are developed as transducers for displacement monitoring. Afterward, a nodal-based Discontinuous Deformation Analysis (NDDA) method is applied to simulate the whole process of the physical model tests and to compare with experimental results. The variation process and law curves of the displacements in the surrounding rock and at key points in the side walls are obtained at excavation stages. The study shows that the application of the displacement measurement methods used in the surrounding rock masses for large-scale model tests of cavern group under true 3-D stress state have achieved satisfactory results.
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DOI：
10.1016/j.ijrmms.2008.01.012
发表时间：
2008-12-01
影响因子：
7.2
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2015-04-10
影响因子：
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影响因子：
6.9
作者：
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通讯作者：
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