本文選題：巖石力學 + 液壓致裂��； 參考：《巖石力學與工程學報》2017年S1期

【摘要】：為了更為準確地測定巖石的抗拉強度以降低鉆桿式水壓致裂原地應力系統柔性對最大水平主應力計算的影響,研發(fā)了多直徑巖芯液壓致裂巖石抗拉強度快速試驗機。試驗機參照水壓致裂測試力學過程,基于巖石厚壁筒原理研發(fā),主要核心部件包括加載系統、壓力監(jiān)測和數據采集系統、樣品夾持系統3個部分。為了方便推廣該套試驗設備和此類試驗方法,針對試驗影響因素加壓速率、中心盲孔深度和直徑、空心巖柱內外徑之比等因素開展了57個巖石樣品的試驗工作。試驗結果顯示,空心巖柱盲孔深度對測試結果影響不明顯,但是會影響測試成功率,巖樣盲孔深度可為巖柱高度的0.7~0.8倍�？招膸r柱中心孔直徑會顯著影響測試結果,當中心孔直徑大于20 mm時,中心孔的尺寸效應不再顯著。如果考慮空心巖柱內外徑之比,根據理論分析和試驗數據可知,取0.3~0.5可獲得更為穩(wěn)定的測試數據。試驗采用的加壓速率為0.02 MPa/s,獲得試驗數據穩(wěn)定可靠。此次測試樣品福建長汀下古生界奧陶~志留系板巖的巖石抗拉強度平均值為8.4 MPa。這些認識為后續(xù)規(guī)范地開展此類測試奠定了初步基礎。
[Abstract]:In order to measure the tensile strength of rock more accurately and reduce the effect of the flexibility of in-situ stress system of hydraulic fracturing on the calculation of maximum horizontal principal stress, a rapid testing machine for the tensile strength of hydraulic fracturing rock with multi-diameter core was developed. Based on the principle of rock thick wall tube, the main components of the testing machine include three parts: loading system, pressure monitoring and data acquisition system, sample clamping system. In order to popularize the test equipment and this kind of test method, 57 rock samples were tested according to the factors such as the pressure rate of the test factors, the depth and diameter of the center blind hole, the ratio of the inner and outer diameter of the hollow rock column, etc. The test results show that the blind hole depth of the hollow rock column has no obvious effect on the test results, but it will affect the success rate of the test, and the blind hole depth of the rock sample can be 0.7 to 0.8 times the height of the rock column. The diameter of the central hole of the hollow rock column will significantly affect the test results. When the diameter of the central hole is larger than 20 mm, the size effect of the central hole is no longer significant. If the ratio of inner and outer diameter of hollow rock column is considered, according to theoretical analysis and experimental data, a more stable test data can be obtained by taking 0.3% 0.5. The compression rate of the test is 0.02 MPA / s, and the experimental data are stable and reliable. The average tensile strength of the lower Paleozoic Ordovician ~ Silurian slate in Changting Fujian Province is 8.4 MPA. These understandings lay a foundation for the following standardized testing.
【作者單位】： 中國地震局地殼應力研究所地殼動力學重點實驗室;安徽省特種設備檢測院;中國地質大學工程技術學院;
【基金】：國家自然科學基金面上基金項目(41274100) 中央級科研院所基本科研業(yè)務專項資助項目(ZDJ2012 20) 中國大陸綜合地球物理場觀測儀器研發(fā)專項(Y201616)~~
【分類號】：TU45

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本文編號：1947484