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| 1 | 深部复合地层TBM隧道围岩应力与变形规律模型试验研究显示文摘为研究深部复合地层TBM隧道有、无支护条件下围岩应力变形破裂与地层效应之间的关系,采用自行研制的双轴平面应变相似模型试验系统,运用应力、应变量测装置及自主开发的精细化岩土数字照相量测系统PhotoInfor,对深部复合地层TBM隧道进行了试验研究。结果表明:上软下硬地层中,应力分布不均,硬岩部分应力较大,变形破裂的模式差异大,不均匀性明显,地层效应显著;有、无支护条件下围岩内部应力随围压增大而增大,且沿洞径方向呈先增后减的变化趋势;再现了无支护条件下围岩变形破裂及松动圈发展全过程,上部软岩以坍塌为主,下部硬岩以破裂为主;获得了硐周岩体径向位移发展阶段;支护结构可有效改善围岩应力重分布情况、减缓围岩卸载速度,提高围岩的自承载能力和隧道的整体稳定性。 | 李元海 刘德柱 杨硕 孔骏 | 2021 | 岩土力学2021，42，7： | 20 |
| 2 | Model Test of Deformation Evolution and Multi Factor Prediction of Anchorage Slope Stability under Rainfall Condition显示文摘The stability of the anchorage slope on the Baiyang Yangtze River Highway Bridge in Yichang,China,was investigated under different rainfall conditions using model test,numerical simulation,and factor analysis.The results of the study are as follows:(1)with the increase of rainfall intensity,the change of earth pressure can be divided into three stages.However,when the rainfall intensity was larger than a certain value,the change of earth pressure of cut slope became two stages;with the increase of rainfall intensity,pore water pressure increased with the increase of rainfall time,while at a certain stage after the rainfall,the pore water pressure in the cut slope did not decrease immediately,but increased for a period of time.(2)When the rainfall stopped,the stability coefficient of the anchorage slope continued to decrease,then slowly increased,and finally tended to be gentle.Meanwhile,when the rainstorm reached a certain intensity,the main factor that restricted the rainfall infiltration rate became the geotechnical permeability coefficient of the cut slope,which was no longer the rainfall intensity.(3)Factor analysis shows that the rainfall intensity and rainfall duration were the most important factors for anchorage slope stability,while earth pressure,pore water pressure and slope displacement were much less significant. | Tingyao Wu Jianhong Jia Nan Jiang Chuanbo Zhou Xuedong Luo Yuqing Xia | 2020 | Journal of Earth Science2020，31，6： | 3 |
| 3 | Geomechanical model test for analysis of surrounding rock behaviours in composite strata显示文摘Due to the large differences in physico-mechanical pro perties of composite strata,jamming,head sinking and other serious consequences occur frequently during tunnel boring machine(TBM)excavation.To analyse the stability of surrounding rocks in composite strata under the disturbance of TBM excavation,a geomechanical model test was carried out based on the Lanzhou water supply project.The evolution patterns and distribution characteristics of the strain,stress,and tunnel deformation and fracturing were analysed.The results showed that during TBM excavation in the horizontal composite formations(with upper soft and lower hard layers and with upper hard and lower soft layers),a significant difference in response to the surrounding rocks can be observed.As the strength ratio of the surrounding rocks decreases,the ratio of the maximum strain of the hard rock mass to that of the relatively soft rock mass gradually decreases.The radial stress of the relatively soft rock mass is smaller than that of the hard rock mass in both types of composite strata,indicating that the weak rock mass in the composite formation results in the difference in the mechanical behaviours of the surrounding rocks.The displacement field of the surrounding rocks obtained by the digital speckle correlation method(DSCM)and the macro-fracture morphology after tunnel excavation visually reflected the deformation difference of the composite rock mass.Finally,some suggestions and measures were provided for TBM excavation in composite strata,such as advance geological forecasting and effective monitoring of weak rock masses. | Linken Shi Hui Zhou Ming Song Jingjing Lu Zhenjiang Liu | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，4： | 3 |
| 4 | 深埋大断面软岩巷道锚网索支护在某矿的试验及应用显示文摘以某矿3采区运输下山深埋软岩大断面巷道为工程背景,开展了锚网索支护设计,并利用FLAC数值模拟分析了巷道围岩应力、位移、塑性区等特征及支护效果。数值模拟结果表明:锚网索支护时顶底板应力为0~16 MPa,两帮应力为16~24 MPa、应力峰值为24 MPa;顶底板和两帮变形量分别为110、31 mm;塑性区基本位于锚固区域内,围岩整体控制效果较好。现场试验监测结果表明,巷道顶底板和两帮变形量为117、54 mm,围岩整体变形量较小,支护效果良好,验证了支护设计的可靠性与数值计算的合理性。 | 曾晋 | 2018 | 矿业安全与环保2018，45，2： | 2 |
| 5 | Experimental Simulation and Numerical Modeling of Deformation and Damage Evolution of Pre-Holed Sandstones After Heat Treatment显示文摘The deformation and damage evolution of sandstone after heat treatment greatly influence the efficient and safe development of deep geothermal energy extraction.To investigate this issue,laboratory confined compression tests and numerical simulations were conducted on pre-holed sandstone specimens after heat treatment.The laboratory test results show that the failure modes are closely related to the heat treatment temperature,with increasing treatment temperature,the failure modes change from mixed and shear modes to a splitting mode.The cracks always initiate from the sidewalls of the hole and then propagate.The failure process inside the hole proceeds as follows:calm period,particle ejection period,rock fragment exfoliation period and rock failure period.The specimens have different final failure features for the entire rock after heat treatment,but have the same failure features inside the hole.These phenomena can be explained by numerical simulations.The numerical simulations reveal that the failure modes in the numerical results agree very well with those observed in the experimental results.The damage zone always occurs at sidewalls of the hole and then propagates to the entire rock affected by shear or tensile damage.From 20℃to 200℃,thermal effect may promote shear damage and restrain tensile damage,while from 200℃to 800℃,thermal effect promotes tensile damage and restrains shear damage.Notably,the damage zone near the sidewalls of the hole has the same distribution range and pattern.Finally,the differences in the mechanisms due to increasing heat temperature are evaluated using scanning electron microscope(SEM)observations. | Shuo Yang Yuanhai Li Xiaojie Tang Jinshan Liu | 2020 | Computer Modeling in Engineering & Sciences2020，，2： | 1 |
| 6 | 极高地应力软岩隧道围岩变形时空效应分析显示文摘为探明隧道开挖时围岩变形时空效应特征,采用室内模型试验、理论分析和现场监测等方法,分析了宁缠极高地应力软岩隧道在不同开挖法下围岩的时空变形规律和时空特征曲线类型,研究了距隧道洞壁不同范围内的围岩径向变形规律。研究表明:极高地应力软岩隧道围岩变形的时空特征曲线可分为“抛物线”型和“台阶”型;“抛物线”型曲线包括急速增长和缓慢增长2个变形阶段,变形规律符合二次函数关系;“台阶”型曲线包括急速增长、缓慢增长、快速增长和基本稳定4个变形阶段,变形规律符合指数函数关系;隧道开挖引起围岩径向变形的范围大致是距洞壁0~2.5 D,距离洞壁不同范围内的围岩径向变形规律符合指数函数关系。研究结果对确定极高地应力软岩隧道的施工工序和最佳支护时机具有重要价值。 | 陈志敏 王洪 龚军 李增印 彭易 | 2023 | 公路2023，68，12： | 0 |
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