含裂隙充填节理岩体的压剪断裂机制研究

doi:10.13722/j.cnki.jrme.2016.1189

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摘要

节理弱面是造成岩体力学性能弱化的主要因素，而充填物质的非均质性将显著影响节理岩体的剪切力学特性。考虑压剪应力作用下贯通性节理充填物中沿节理方向裂隙对节理岩体断裂特性的影响，制取含不同长度初始裂隙的充填砂浆节理岩体试样，在单轴压缩作用下研究含裂隙充填节理岩体的压剪断裂机制及初始裂隙尺寸对节理岩体破裂模式和断裂能的影响规律。试验结果表明：(1) 单轴压缩作用下，充填节理岩体的失稳过程分为断裂和摩擦两阶段，前者为节理内裂隙的起裂、扩展到贯通过程，峰值强度后承载力迅速降低，之后因宏观破裂面的压剪摩擦作用而出现强化现象，直至剪应力达到其抗剪强度而失稳破坏；(2) 随着充填体内初始裂隙长度增大，试样峰值荷载线性减小，峰值脆性断裂特征更加明显；(3) 无初始裂隙节理试样破裂过程中裂隙在节理内分布均匀，而含初始裂隙试样断裂从裂隙尖端开始，向充填体和花岗岩块体黏接面扩展贯通，充填体内裂隙集中而密度较低；(4) 采用节理韧带体积V_jc改进断裂能计算公式，计算充填节理岩体压剪断裂能G_f_-V；基于充填节理的断裂机制，提出局部断裂能g_f_-V沿韧带双线性分布的前边界效应模型，解释了平均断裂能G_f_-V随初始裂隙长度增大而减小的原因，试验结果验证了模型的正确性。

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	钟志彬1
	2
	HU Xiaozhi2
	邓荣贵1
	付小敏3
	吕蕾2
	4

关键词 ：岩石力学, 充填节理, 初始裂隙, 压剪断裂机制, 断裂能, 前边界效应, 双线性模型

Abstract：

Joints and weak layers are the key factors for possible rock mass failure or sliding，within which the heterogeneous infilled materials in joints strongly influence the shear mechanical behavior of rock mass and then its shear failure. Considering the effect of crack in infilled materials on the fracture characteristic of pre-existing jointed rock mass under compression-shear stress state，mortar infilled jointed rock mass specimens including various artificial lengths were prepared，and uniaxial compressive tests were carried out to investigate their compression-shear fracture mechanisms and the effect of pre-cracks sizes on fracture modes and fracture energy of jointed rock mass. The experimental results show that：(1) under uniaxial compression，the failure process of infilled jointed rock mass can be divided into two stages：fracture stage and friction stage. The former was the process of initiation，propagation and coalescence of cracks. The load bearing capacity was rapidly reduced after the peak load，and then gradually increased due to the increasing friction force. Finally，it failed when the shear stress reached its shear strength. (2) With the increasing pre-existing crack length in infilled jointed rock mass，the peak load of specimens was decreased linearly，while the fracture process was more brittle. (3) For the infilled jointed specimens without pre-crack，multiple micro-cracks were generated throughout the infilled joint during the fracture. However，for the pre-cracked specimens，they cracked from the tips and propagated to the adhesive surface of infilled mortar and joint. The stress-induced cracks concentrated with relatively low density in the infilled joint. (4) The volume of ligament in joint V_jc was used to modify the formula of fracture energy G_f-V. Based on the fracture mechanism of the infilled joint，the front boundary effect model，whose local fracture energy g_f-V was bilinear distribution along the ligament，was proposed. It explained the reason why the average fracture energy G_f-V decreased with the increasing of pre-crack length，and then it was well verified by the experimental data.

Key words： rock mechanics infilled joint pre-crack specimens compression-shear fracture mechanism fracture energy front boundary effect bilinear model

引用本文:

钟志彬1，2，HU Xiaozhi2，邓荣贵1，付小敏3，吕蕾2，4. 含裂隙充填节理岩体的压剪断裂机制研究[J]. 岩石力学与工程学报, 2018, 37(S1): 3320-3331.
ZHONG Zhibin1，2，HU Xiaozhi2，DENG Ronggui1，FU Xiaomin3，LV Lei2，4. Study on the compression-shear fracture mechanism of infilled jointed rock mass with pre-crack. , 2018, 37(S1): 3320-3331.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.1189 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS1/3320

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