高速铁路隧道间距对岩体变形及应力分布的影响  

Influence of High-speed Railway Tunnels Spacing on Deformation and Stress Distribution of Rock Mass

作　　者：邱冠豪 王飞[2] Qiu Guanhao;Wang Fei(Zhengzhou Design Branch of China Railway Engineering Design and Consulting Group Co.,Ltd.,Zhengzhou 450001,China;Water Science and Engineering School of Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]中铁工程设计咨询集团有限公司郑州设计院,郑州450001 [2]郑州大学水利科学与工程学院,郑州450001

出　　处：《铁道勘察》2022年第3期100-106,共7页Railway Investigation and Surveying

基　　金：中国博士后科学基金会面上项目(2020M682882)。

摘　　要：为研究不同隧道间距下岩体变形及应力分布规律,采用类岩材料制备不同孔洞间距的试样,并对试样进行单轴压缩试验等力学测试,获得试样的峰值应力和弹性模量;利用声发射(AE)装置,获得孔洞间距对声发射参数的影响;采用DIC设备对试样的加载破坏过程进行监测,研究试样受力破坏过程中的动态变化。研究表明,随着两孔洞之间间距增大,试样峰值应力和弹性模量都不断增大,但增大率逐渐减小;声发射计数在压密、弹性阶段相对平静,在塑性阶段较为活跃且增幅明显,在破坏阶段声发射计数最活跃并出现最大计数,破坏后阶段不断趋于安静;随着孔洞间距增大,试样的峰值计数和单轴强度不断增大。研究结果表明,试样在孔顶、底部易形成拉应力集中,产生拉伸裂纹;在孔的两侧形成切向应力集中,产生翼裂纹或剪切裂纹;两孔洞间距越小,孔洞之间应力越集中,越易形成孔洞之间贯通破坏。In order to study the deformation and stress distribution of rock mass with different tunnel spacings, rock-like materials were used to prepare specimens with different hole spacing, and mechanical tests such as uniaxial compression tests were carried out to obtain the peak stress and elastic modulus of specimens. Effects of hole spacing on acoustic emission parameters were obtained by Acoustic Emission(AE) device. DIC equipment was used to monitor the loading failure process of the specimens, and the dynamic changes of the specimen during the loading failure process were studied. The results show that the peak stress and elastic modulus of the specimen increase with the increase of the spacing between the two cavities, while the increase rate decreases. The AE count is relatively inactive in the compression and elastic stage, more active in the plastic stage and increases obviously, the AE count is most active and maximum in the failure stage and tends to be inactive in the post-failure stage. With the increase of the hole spacing, the peak count and uniaxial strength of the specimen increase. It is found that tensile stress concentration and tensile crack are active to form in the top and bottom of the hole, tangential stress concentration and wing crack or shear crack are active to form in the two sides of the hole. The smaller the distance between the two holes, the more concentrated the stress between the holes, the easier it is for the holes to form through failure.

关 键 词：高速铁路 隧道间距 岩体变形 应力分布 弹性理论 

分 类 号：TU431[建筑科学—岩土工程] TU433[建筑科学—土工工程]