本文選題：直接拉伸　切入點：試驗系統(tǒng)　出處：《巖土力學》2017年S1期 　論文類型：期刊論文

【摘要】：根據(jù)巖石廣義應力松弛特性試驗研究的需要,自主研制了基于應力歸還法的單軸拉伸伺服控制試驗系統(tǒng)。該系統(tǒng)的(1)實現(xiàn)了應力歸還法控制,既能單獨控制加載傳統(tǒng)的位移、應力,也可伺服控制應力-應變線性組合;(2)測量、控制系統(tǒng)采用硬件實現(xiàn)而非計算機軟件,結構簡單緊湊,系統(tǒng)動作反應時間短,性能穩(wěn)定可靠,升級改造空間大;(3)控制及監(jiān)測數(shù)據(jù)均采用模擬信號傳輸,試驗過程控制及數(shù)據(jù)采集精度均較高;(4)采用高強度粘接劑直接拉伸,使試件完全處于被拉伸狀態(tài),能更真實地模擬工程實際中巖體的受力狀態(tài)。采用該試驗系統(tǒng),對田下凝灰?guī)r進行了拉應力條件下的廣義應力松弛試驗,試驗結果表明,其具有較好的實用性和可靠性,為研究工程實際中巖石受拉應力作用下的廣義應力松弛力學性質提供了新的試驗方法及手段。
[Abstract]:According to the generalized need of experimental research on stress relaxation characteristics of the developed stress return method of uniaxial tensile test. The servo control system based on the system (1) the stress return control, displacement, which can independently control the traditional loading stress, but also the linear combination of stress servo control strain; (2) measurement and control system using hardware rather than software, simple and compact structure, system action short reaction time, stable and reliable performance, upgrade large space; (3) monitoring and control data were simulated using the signal transmission, test process control and data acquisition accuracy; (4) the high strength direct tensile adhesive, the specimen is completely stretched, can more accurately simulate the stress state of rock mass in practical engineering. By using the test system, the generalized force under the condition of tensile stress relaxation test of tage tuff of The test results show that it has good practicability and reliability. It provides a new test method and method for studying the generalized stress relaxation mechanical properties of rock under tensile stress in engineering practice.

【作者單位】： 重慶大學煤礦災害動力學與控制國家重點實驗室;中國葛洲壩集團易普力股份有限公司;中煤科工集團重慶研究院有限公司;東京大學工學系;
【基金】：國家自然科學基金(No.51304255,No.51474040) 中國博士后科學基金(No.2014M552323) 重慶市博士后資助項目(No.Xm2014037)~~
【分類號】：TU45
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本文編號：1590722