含内缺陷注浆固结体力学特性试验研究

doi:10.13722/j.cnki.jrme.2019.1224

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摘要注浆是岩土工程中常用的加固方法，然而实际工程中形成的注浆固结体多含内缺陷，大多数注浆固结体的破坏本质上是含内缺陷固结体的破坏。为此设计一种含内缺陷试样的制备方法，进行一系列含内缺陷固结体试样的力学特性试验，并通过PFC2D数值方法对含内缺陷固结体进行数值对比试验。试验结果显示内缺陷的数量和位置均对注浆固结体的强度有显著影响，而且含内缺陷注浆固结体的破坏首先发生在缺陷位置处，初始阶段在孔洞上下周围位置出现极少量微剪切裂纹和少量微张拉裂纹，随着加载的进程各缺陷的微张拉裂纹不断扩展至贯通，进而导致试样最终破坏。研究成果可为注浆工程设计和施工提供一定的理论支持，也可为其他同类型工程提供新的思路。

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	卢海峰1
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	曹爱德1
	刘泉声1
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	张晗1
	吴月秀1
	2
	魏志超1

关键词 ：岩石力学, 注浆加固, 内缺陷注浆固结体, 力学特性：数值模拟

Abstract：Grouting is a commonly used reinforcement method in geotechnical engineering. The grouting consolidation bodies formed in actual engineering projects are generally inner-defect-containing，and the failure of the grouting consolidation bodies is actually the destruction of those internal defects. In this paper，a preparation method of samples with internal defects is designed and a series of mechanical tests of samples with internal defects are conducted. The numerical method of PFC2D is used to carry out the numerical contrast test on the inner-defect-containing grouting consolidation bodies(IGCB). The test results demonstrate that the number and position of internal defects have a significant effect on the strength of grouting consolidation bodies and the failure of IGCB first occurs at the defect position. In the initial stage of failure，a small amount of micro-shear cracks and micro-tensile cracks respectively appear at the upper and lower positions around the hole. With the loading process going on，the micro-tensile cracks at each defective point continue to extend and finally run through，resulting in a final destruction of the sample. The preparation method of samples with internal defects and the research work can provide some theoretical supports for design and construction in grouting engineering as well as some new ideas for other similar projects.

Key words： rock mechanics')" href="#">

rock mechanics grouting reinforcement grouting consolidation body with internal defects mechanical properties ')" href="#">numerical simulation

引用本文:

卢海峰1，2，曹爱德1，刘泉声1，2，张晗1，吴月秀1，2，魏志超1. 含内缺陷注浆固结体力学特性试验研究[J]. 岩石力学与工程学报, 2020, 39(8): 1560-1571.
LU Haifeng1，2，CAO Aide1，LIU Quansheng1，2，ZHANG Han1，WU Yuexiu1，2，WEI Zhichao1. Experimental study on mechanical properties of grouting consolidating bodies with inner defects. , 2020, 39(8): 1560-1571.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.1224 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I8/1560

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