郑万铁路巴东组泥岩力学试验研究  

Study on Mechanical Tests of Mudstone of Badong Formation for Zhengzhou-Wanzhou Railway

作　　者：王国军 朱小兵 刘保林 赵东平[2,3] 季启航 WANG Guojun;ZHU Xiaobing;LIU Baolin;ZHAO Dongping;JI Qihang(CREEC(Chongqing)Survey,Design and Research Co.,Ltd.,Chongqing 400023,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁二院重庆勘察设计研究院有限责任公司,重庆400023 [2]西南交通大学交通隧道工程教育部重点实验室,成都610031 [3]西南交通大学,成都610031

出　　处：《高速铁路技术》2022年第6期92-96,共5页High Speed Railway Technology

摘　　要：为得到隧道围岩体的物理力学参数,本文开展了烘干状态与饱水状态下巴东组泥岩的单轴、三轴压缩试验,结果表明:(1)在单轴试验条件下,烘干状态巴东组泥岩单轴抗压强度为39·74 MPa,弹性模量为8·84 GPa,饱水状态单轴抗压强度为29·41 MPa,弹性模量为7·23 GPa;(2)在三轴试验条件下,烘干状态巴东组泥岩的内摩擦角为53·91°,粘聚力为7·35 MPa,饱水状态内摩擦角为48·85°,粘聚力为6·61 MPa;(3)随着围压的增大,巴东组泥岩的弹性模量逐渐增大,水对巴东组泥岩弹性模量的削弱作用更为显著。根据现场掌子面揭示情况,利用RocLab程序将试验所得的岩样参数转化为了现场岩体的参数。In order to obtain the physical and mechanical parameters of the surrounding rock mass in the tunnel,we carried out the uniaxial and triaxial compression tests of mudstone of Badong Formation in the oven-dried state and water saturated state. The results show that:(1)Under the uniaxial test conditions,the uniaxial compressive strength and elastic modulus of mudstone of Badong Formation are 39. 74 MPa and 8. 84 GPa respectively in the oven-dried state,and 29. 41 MPa and 7. 23 GPa respectively in the water saturated state.(2)Under the triaxial test conditions,the internal friction angle and cohesion of mudstone of Badong Formation are 53. 91°and 7. 35 MPa respectively in the oven-dried state,and 48. 85°and 6. 61 MPa respectively in the water saturated state.(3)With the increase of confining pressure,the elastic modulus of mudstone of Badong Formation gradually increases,and the weakening effect of water on the elastic modulus of mudstone of Badong Formation is more obvious. According to the conditions revealed by the tunnel face on site,we use RocLab program to convert the parameters of the rock samples obtained from these tests into the parameters of the on-site rock mass.

关 键 词：岩石力学 力学试验 巴东组泥岩 水作用 岩体参数 

分 类 号：TU451.2[建筑科学—岩土工程]