黄(骅南站)大(家洼站)铁路黄河特大桥主桥顶推施工具有顶推重量大、距离长、顶推点多等特点,要求滑动面具有较高的抗压、耐磨性能。通过对顶推滑动面组成材料进行试验对比,合理选择润滑剂,最终选用MGB板、20 mm Q345B钢板+5 mm不锈钢板...黄(骅南站)大(家洼站)铁路黄河特大桥主桥顶推施工具有顶推重量大、距离长、顶推点多等特点,要求滑动面具有较高的抗压、耐磨性能。通过对顶推滑动面组成材料进行试验对比,合理选择润滑剂,最终选用MGB板、20 mm Q345B钢板+5 mm不锈钢板热轧熔合滑道板加二硫化钼锂基润滑脂为核心的滑动面,成功克服了以往顶推中易出现的滑道板起鼓褶皱、脱离更换等问题,保证了顶推施工顺利进行。展开更多
Large-scale detailed mapping plays a key role in revealing the rupture characteristics and mechanisms of strong earthquakes.Relatively few studies have been performed on the surface ruptures of large earthquakes in ce...Large-scale detailed mapping plays a key role in revealing the rupture characteristics and mechanisms of strong earthquakes.Relatively few studies have been performed on the surface ruptures of large earthquakes in central and western Tibet due to its remote nature and high elevation.Based on high-resolution unmanned aerial vehicle(UAV)photography,we mapped the coseismic surface rupture of the 2014 Yutian M_s7.3 earthquake.Along the western Altyn Tagh fault system,the earthquake produced~37 km of surface rupture along the South Xor Kol fault(southern section S1),Xor Kol fault(central section S2)and Ashikule fault(northern section S3).Section S1 has a 16-km-long surface rupture with an average sinistral offset of 52±25 cm and a maximum offset of~90 cm,while section S3 has a 14.2-km-long surface rupture with an average sinistral offset of 36±21 cm and a maximum offset of~84 cm.A compilation of 5308 cracks yields an average crack width along the southern section of 85±71 cm and a maximum width of~700 cm;the average width along the central section is 39±21 cm,and the maximum width is 243 cm;and the average width along the northern section is 61±44 cm with a maximum of~340 cm.In addition,the average cumulative opening across rupture zone is 3.4±2.9 m along the southern section,with a maximum of~17 m;4.3±3.6 m along the central section,with a maximum of~13 m;and 1.7±1.6 m along the northern section,with a maximum of~6 m.Evidently,the average crack width and cumulative opening decrease towards bends and steps along the fault.A global synthesis of surface rupture distributions corresponding to strike-slip earthquakes indicates that the rupture zone is wider near the complex parts of fault geometries(such as bends,steps and fault bifurcations)than along straight sections,suggesting that the fault geometry has an obvious control on the surface rupture width.The widespread cracks at the intersection between the Xor Kol and South Xor Kol faults may indicate that an extensional regime is more likely to produce distrib展开更多
文摘黄(骅南站)大(家洼站)铁路黄河特大桥主桥顶推施工具有顶推重量大、距离长、顶推点多等特点,要求滑动面具有较高的抗压、耐磨性能。通过对顶推滑动面组成材料进行试验对比,合理选择润滑剂,最终选用MGB板、20 mm Q345B钢板+5 mm不锈钢板热轧熔合滑道板加二硫化钼锂基润滑脂为核心的滑动面,成功克服了以往顶推中易出现的滑道板起鼓褶皱、脱离更换等问题,保证了顶推施工顺利进行。
基金supported by the National Natural Science Foundation of China(Grant Nos.41902216,U1839203)Central Public-Interest Scientific Institution Basal Research Fund(Grant Nos.IGCEA1814,IGCEA1812)。
文摘Large-scale detailed mapping plays a key role in revealing the rupture characteristics and mechanisms of strong earthquakes.Relatively few studies have been performed on the surface ruptures of large earthquakes in central and western Tibet due to its remote nature and high elevation.Based on high-resolution unmanned aerial vehicle(UAV)photography,we mapped the coseismic surface rupture of the 2014 Yutian M_s7.3 earthquake.Along the western Altyn Tagh fault system,the earthquake produced~37 km of surface rupture along the South Xor Kol fault(southern section S1),Xor Kol fault(central section S2)and Ashikule fault(northern section S3).Section S1 has a 16-km-long surface rupture with an average sinistral offset of 52±25 cm and a maximum offset of~90 cm,while section S3 has a 14.2-km-long surface rupture with an average sinistral offset of 36±21 cm and a maximum offset of~84 cm.A compilation of 5308 cracks yields an average crack width along the southern section of 85±71 cm and a maximum width of~700 cm;the average width along the central section is 39±21 cm,and the maximum width is 243 cm;and the average width along the northern section is 61±44 cm with a maximum of~340 cm.In addition,the average cumulative opening across rupture zone is 3.4±2.9 m along the southern section,with a maximum of~17 m;4.3±3.6 m along the central section,with a maximum of~13 m;and 1.7±1.6 m along the northern section,with a maximum of~6 m.Evidently,the average crack width and cumulative opening decrease towards bends and steps along the fault.A global synthesis of surface rupture distributions corresponding to strike-slip earthquakes indicates that the rupture zone is wider near the complex parts of fault geometries(such as bends,steps and fault bifurcations)than along straight sections,suggesting that the fault geometry has an obvious control on the surface rupture width.The widespread cracks at the intersection between the Xor Kol and South Xor Kol faults may indicate that an extensional regime is more likely to produce distrib
