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应力应变监控技术在某水毁治理工程中的应用 被引量:1
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作者 陈红霞 马廷霞 +2 位作者 朱亚明 谢娜娜 张瑜 《石油工业技术监督》 2014年第3期42-45,共4页
遭遇洪水冲刷而漂浮于河水中的管道对整条管道的安全运行存在很大的潜在威胁。对其进行沉管治理,对沉降管道进行力学分析,找出危险截面。在此基础上,针对沉管过程中管道受力复杂且难以控制从而导致管道破坏的问题,采用应力应变实时监控... 遭遇洪水冲刷而漂浮于河水中的管道对整条管道的安全运行存在很大的潜在威胁。对其进行沉管治理,对沉降管道进行力学分析,找出危险截面。在此基础上,针对沉管过程中管道受力复杂且难以控制从而导致管道破坏的问题,采用应力应变实时监控技术监测整个沉管过程中危险截面的实时应力应变情况,基于监测到的应力值提出相应的措施以控制沉管过程中管道危险截面的应力于许用范围之内。结果表明:在整个沉管过程中,应力应变监控技术为管道的安全沉降起到了指导作用。 展开更多
关键词 沉管 应力应变监控技术 应力应变远程监控 实时监测 水毁治理工程
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连续不等跨张弦梁同步张拉施工技术 被引量:2
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作者 张建设 《建筑技术》 北大核心 2011年第11期1015-1017,共3页
福州南站无站台柱雨篷横向为三跨连续张弦梁,须三跨同步张拉,另外三跨跨度各不相同,存在一定的变形和受力不均衡,通过对张弦梁张拉前的施工模拟计算,选择合理的张拉分区、顺序及张拉工艺,配合张拉前、张拉中、张拉后的结构应力、应变双... 福州南站无站台柱雨篷横向为三跨连续张弦梁,须三跨同步张拉,另外三跨跨度各不相同,存在一定的变形和受力不均衡,通过对张弦梁张拉前的施工模拟计算,选择合理的张拉分区、顺序及张拉工艺,配合张拉前、张拉中、张拉后的结构应力、应变双监控等措施,使拉索张拉过程始终处于可控状态,并使张拉安全顺利地完成,完全达到了设计预期要求。 展开更多
关键词 钢结构 大跨度钢结构 应力钢结构 福州南站 连续不等跨 张弦梁 同步张拉 应力应变监控
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Resistivity and thermal infrared precursors associated with cemented backfill mass 被引量:5
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作者 XU Wen-bin 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第9期2329-2335,共7页
The stability of cemented backfill mass is important to keep miners and equipment safe in underground backfill miming.The stress-strain behavior, resistivity and thermal infrared(TIR) characteristics of backfill mass ... The stability of cemented backfill mass is important to keep miners and equipment safe in underground backfill miming.The stress-strain behavior, resistivity and thermal infrared(TIR) characteristics of backfill mass under uniaxial compression were investigated. The monitoring system consisted of a TIR observation system, a stress-strain monitoring system and a resistivity measurement system. Precursory information for impending failure of cemented backfill mass was collected, including TIR, strain and resistivity precursors. The sensitivity and difference of different monitoring information to the same failure event were compared.The results show that the time-space evolution process of the resistivity and TIR is basically the same as the whole process from compression deformation to failure of backfill mass, and the time variation of resistivity and TIR is obviously characterized by stage.The resistivity precursor turns out earlier than the TIR and the strain. The resistivity relation with loading compression is anti-symmetry, decreasing as the compression stress increases before the peak strength of backfill mass. However, when the backfill mass enters into the phase of failure, the resistivity starts to increase as the stress increases. The change of the resistivity growth direction can be regarded as the resistivity-caution-point for the failure of backfill mass under uniaxial compression. It is also indicated that the TIR information mainly represents the surface temperature evolution in the process of compression before the backfill enters into the plastic-yield state. It can be a valuable tool to obtain the precursors for failure of cemented backfill mass for backfill mines. 展开更多
关键词 cemented backfill mass thermal infrared characteristic RESISTIVITY uniaxial compression
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