多直径岩芯液压致裂岩石抗拉强度快速试验机研发

发布时间：2018-05-28 16:57

本文选题：岩石力学 + 液压致裂　；参考：《岩石力学与工程学报》2017年S1期

【摘要】：为了更为准确地测定岩石的抗拉强度以降低钻杆式水压致裂原地应力系统柔性对最大水平主应力计算的影响,研发了多直径岩芯液压致裂岩石抗拉强度快速试验机。试验机参照水压致裂测试力学过程,基于岩石厚壁筒原理研发,主要核心部件包括加载系统、压力监测和数据采集系统、样品夹持系统3个部分。为了方便推广该套试验设备和此类试验方法,针对试验影响因素加压速率、中心盲孔深度和直径、空心岩柱内外径之比等因素开展了57个岩石样品的试验工作。试验结果显示,空心岩柱盲孔深度对测试结果影响不明显,但是会影响测试成功率,岩样盲孔深度可为岩柱高度的0.7~0.8倍。空心岩柱中心孔直径会显著影响测试结果,当中心孔直径大于20 mm时,中心孔的尺寸效应不再显著。如果考虑空心岩柱内外径之比,根据理论分析和试验数据可知,取0.3~0.5可获得更为稳定的测试数据。试验采用的加压速率为0.02 MPa/s,获得试验数据稳定可靠。此次测试样品福建长汀下古生界奥陶~志留系板岩的岩石抗拉强度平均值为8.4 MPa。这些认识为后续规范地开展此类测试奠定了初步基础。
[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.
【作者单位】：中国地震局地壳应力研究所地壳动力学重点实验室;安徽省特种设备检测院;中国地质大学工程技术学院;
【基金】：国家自然科学基金面上基金项目(41274100) 中央级科研院所基本科研业务专项资助项目(ZDJ2012 20) 中国大陆综合地球物理场观测仪器研发专项(Y201616)~~
【分类号】：TU45

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