由于粗粒土的直剪试验存在显著的尺寸效应,且室内常规直剪仪无法调整试样尺寸,所以难以准确获得粗粒土的抗剪强度参数。基于此问题,介绍了一种可以改变试样尺寸的组装式直剪仪。该直剪仪由出力装置、位移量测装置、反力框架、剪切盒等...由于粗粒土的直剪试验存在显著的尺寸效应,且室内常规直剪仪无法调整试样尺寸,所以难以准确获得粗粒土的抗剪强度参数。基于此问题,介绍了一种可以改变试样尺寸的组装式直剪仪。该直剪仪由出力装置、位移量测装置、反力框架、剪切盒等部分组成。通过改变每一层剪切盒的钢环嵌套个数来改变试样的直径,直径有6.18、10、15、20 cm 4个取值;改变剪切盒的叠置层数来改变试样的高度,高度有5、10、15、20 cm 4个取值,试样直径和高度共有16种组合。在此基础上,选取薛城水电站引水隧洞开挖弃渣为试样,进行5组平行直剪试验,验证了该直剪仪的可重复性以及试验结果的可靠性。改变试样直径D与高度H的组合,进行一系列直剪试验研究了该试样直剪试验的尺寸效应,得出该试样的合理试样尺寸。展开更多
Tibetan Plateau is known as the roof of the world.Due to the continuous uplift of the Tibetan Plateau,many active fault zones are present.These active fault zones such as the Anninghe fault zone have a significant inf...Tibetan Plateau is known as the roof of the world.Due to the continuous uplift of the Tibetan Plateau,many active fault zones are present.These active fault zones such as the Anninghe fault zone have a significant influence on the formation of special geomorphology and the distribution of geological hazards at the eastern edge of the Tibetan Plateau.The Anninghe fault zone is a key part of the Y-shaped fault pattern in the Sichuan-Yunnan block of China.In this paper,high-resolution topographic data,multitemporal remote sensing images,numerical calculations,seismic records,and comprehensive field investigations were employed to study the landslide distribution along the active part of the Anninghe.The influence of active faults on the lithology,rock mass structures and slope stress fields were also studied.The results show that the faults within the Anninghe fault zone have damaged the structure and integrity of the slope rock mass,reduced the mechanical strength of the rock mass and controlled the slope failure modes.The faults have also controlled the stress field,the distribution of the plastic strain zone and the maximum shear strain zone of the slope,thus have promoted the formation and evolution of landslides.We find that the studied landslides are linearly distributed along the Anninghe fault zone,and more than 80%of these landslides are within 2–3 km of the fault rupture zone.Moreover,the Anninghe fault zone provides abundant substance for landslides or debris flows.This paper presents four types of sliding mode control of the Anninghe fault zone,e.g.,constituting the whole landslide body,controlling the lateral boundary of the landslide,controlling the crown of the landslide,and constituting the toe of the landslide.The results presented merit close attention as a valuable reference source for local infrastructure planning and engineering projects.展开更多
文摘由于粗粒土的直剪试验存在显著的尺寸效应,且室内常规直剪仪无法调整试样尺寸,所以难以准确获得粗粒土的抗剪强度参数。基于此问题,介绍了一种可以改变试样尺寸的组装式直剪仪。该直剪仪由出力装置、位移量测装置、反力框架、剪切盒等部分组成。通过改变每一层剪切盒的钢环嵌套个数来改变试样的直径,直径有6.18、10、15、20 cm 4个取值;改变剪切盒的叠置层数来改变试样的高度,高度有5、10、15、20 cm 4个取值,试样直径和高度共有16种组合。在此基础上,选取薛城水电站引水隧洞开挖弃渣为试样,进行5组平行直剪试验,验证了该直剪仪的可重复性以及试验结果的可靠性。改变试样直径D与高度H的组合,进行一系列直剪试验研究了该试样直剪试验的尺寸效应,得出该试样的合理试样尺寸。
基金supported by China Geological Survey Projects(Grant No.20160272,20211379)the Second Tibetan Plateau Scientific Expedition and Research Program(Grant No.2019QZKK0904)Sichuan Science and Technology Program of China(Grant No.2020YFS0296).
文摘Tibetan Plateau is known as the roof of the world.Due to the continuous uplift of the Tibetan Plateau,many active fault zones are present.These active fault zones such as the Anninghe fault zone have a significant influence on the formation of special geomorphology and the distribution of geological hazards at the eastern edge of the Tibetan Plateau.The Anninghe fault zone is a key part of the Y-shaped fault pattern in the Sichuan-Yunnan block of China.In this paper,high-resolution topographic data,multitemporal remote sensing images,numerical calculations,seismic records,and comprehensive field investigations were employed to study the landslide distribution along the active part of the Anninghe.The influence of active faults on the lithology,rock mass structures and slope stress fields were also studied.The results show that the faults within the Anninghe fault zone have damaged the structure and integrity of the slope rock mass,reduced the mechanical strength of the rock mass and controlled the slope failure modes.The faults have also controlled the stress field,the distribution of the plastic strain zone and the maximum shear strain zone of the slope,thus have promoted the formation and evolution of landslides.We find that the studied landslides are linearly distributed along the Anninghe fault zone,and more than 80%of these landslides are within 2–3 km of the fault rupture zone.Moreover,the Anninghe fault zone provides abundant substance for landslides or debris flows.This paper presents four types of sliding mode control of the Anninghe fault zone,e.g.,constituting the whole landslide body,controlling the lateral boundary of the landslide,controlling the crown of the landslide,and constituting the toe of the landslide.The results presented merit close attention as a valuable reference source for local infrastructure planning and engineering projects.
