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川西海子山超固结土工程地质特性及成因机理研究 总被引:1,自引:1,他引:0
川西海子山晚更新世冰川遗迹发育且保存完整,在某场地工程地质勘查中揭示,海子山冰川堆积物普遍具有固结较好、承载力较高的特点,含砾中、粗砂层承载力可达500~800 kPa,远高于其他成因的同类土,为超固结土。结合物探、钻探、详细的地面测绘、显微分析及孢粉分析,通过标贯及载荷试验、室内土工试验等,揭示区内低凹地段均有超固结土存在,区内超固结土具有低渗透性、低变形、高承载力等工程特性。超固结土是晚更新世古冰帽巨大荷载使冰川底碛排水固结到全新世时冰川消融卸载而成的特殊土体。 相似文献
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Control on Electron Beam Scanning Track. 总被引:5,自引:0,他引:5
In order to use electron beam as a movable welding heat source and whose energy distribution along its moving trace can be controlled, a method of electron beam scanning track and scanning mode control was put forward. Based on it, the electron beam scanning track and scanning mode can be edited at will according to actual requirements, and the energy input of each point of the scanning track can be controlled. In addition, the scanning frequency and points control, real time adjusting of the scanning track etc. were explained. This method can be used in electron beam brazing, surface modification, surface heat treatment etc. 相似文献
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