【摘要】：節(jié)理巖體是巖體工程中最常見、最重要的介質(zhì)。一般情況下，節(jié)理會(huì)被軟泥、沙礫等物質(zhì)填充；在實(shí)際工程中，節(jié)理則會(huì)被混凝土等工程材料填充。由于節(jié)理的結(jié)構(gòu)及性狀對(duì)巖體的物理力學(xué)性質(zhì)有著不可忽視的影響，那么考慮含填充節(jié)理巖體的本構(gòu)模型則具有非常重要的實(shí)際意義。 為此，本研究基于巖體結(jié)構(gòu)力學(xué)觀點(diǎn)，把巖體看作由含一定厚度填充物的節(jié)理和巖石塊體組成的復(fù)合體，建立了一種考慮節(jié)理幾何特征及強(qiáng)度參數(shù)的巖體力學(xué)模型。并采用水泥砂漿作為巖石的相似材料，對(duì)預(yù)制節(jié)理巖體進(jìn)行模型試驗(yàn)，研究節(jié)理巖體在單軸壓縮下的破壞機(jī)理，最后利用該模型分析節(jié)理對(duì)巖體強(qiáng)度及破壞模式的影響規(guī)律，，直觀地揭示填充節(jié)理帶來的影響，為相關(guān)巖體工程的設(shè)計(jì)、施工提供參考。 本研究的主要工作如下： （1）對(duì)完整巖體和含填充節(jié)理巖體進(jìn)行室內(nèi)物理模型對(duì)比試驗(yàn)，研究在單軸壓縮情況下，含有不同傾角、貫通度、數(shù)目、不同節(jié)理填充厚度和不同節(jié)理填充物的預(yù)制節(jié)理巖體強(qiáng)度及破壞模式。試驗(yàn)結(jié)果顯示：節(jié)理巖體的破壞模式、峰值強(qiáng)度以及彈性模量都與節(jié)理的構(gòu)造形態(tài)緊密相關(guān)。 （2）對(duì)比完整巖體，對(duì)單條預(yù)制含填充物的貫通節(jié)理巖體單向加載，在一定范圍內(nèi)改變載荷應(yīng)變率和長(zhǎng)徑比，得到巖體抗壓強(qiáng)度和楊氏模量與應(yīng)變率的量級(jí)是相關(guān)的，都隨著應(yīng)變率的增加有所增強(qiáng)；巖體破壞模式不隨應(yīng)變率的變化而發(fā)生改變。 （3）建立反應(yīng)巖體脆塑性特征的完整巖體分段本構(gòu)模型，并用試驗(yàn)數(shù)據(jù)加以驗(yàn)證。然后把巖體看作由含一定厚度填充物的節(jié)理和巖石塊體組成的復(fù)合體，建立一種考慮節(jié)理幾何特征及強(qiáng)度參數(shù)的巖體力學(xué)模型，并且給出該公式關(guān)于各參數(shù)的分析和討論。分析表明：該模型能與試驗(yàn)曲線符合較好，并能反映含填充節(jié)理巖體強(qiáng)度隨節(jié)理參數(shù)變化的特性，具有一定合理性。
[Abstract]:Jointed rock mass is the most common and important medium in rock mass engineering. In general, joints are filled with soft mud, sand and gravel; in practical projects, joints are filled with engineering materials such as concrete. Since the structure and properties of joints have an important influence on the physical and mechanical properties of rock mass, it is of great practical significance to consider the constitutive model of rock mass with jointed rock mass. Therefore, based on the viewpoint of structural mechanics of rock mass, the rock mass is regarded as a complex composed of joints and rock blocks with a certain thickness of fillers, and a mechanical model of rock mass considering the geometric characteristics and strength parameters of joints is established. Using cement mortar as the similar material of rock, the model test of prefabricated jointed rock mass is carried out, and the failure mechanism of jointed rock mass under uniaxial compression is studied. Finally, the influence of joint on rock mass strength and failure mode is analyzed by using this model. The effect of filling joints is revealed intuitively, which provides reference for the design and construction of relevant rock mass engineering. The main work of this study is as follows: (1) the physical models of intact rock mass and filled jointed rock mass are compared with each other in the case of uniaxial compression. Strength and failure mode of prefabricated jointed rock mass with different joint filling thickness and different joint fillers. The results show that the failure mode, peak strength and elastic modulus of jointed rock mass are closely related to the structural morphology of joints. (2) compared with the intact rock mass, the compressive strength and Young's modulus of the rock mass are related to the strain rate and the ratio of length to diameter in a certain range by unidirectional loading of a single prefabricated jointed rock mass containing fillers, and the compressive strength and Young's modulus of the rock mass are related to the strain rate. With the increase of strain rate; The failure mode of rock mass does not change with the change of strain rate. (3) the complete piecewise constitutive model of rock mass is established and verified by experimental data. Then, the rock mass is regarded as a complex composed of joints and rock blocks with a certain thickness of fillers, and a rock mass mechanics model considering the geometric characteristics and strength parameters of joints is established, and the analysis and discussion on the parameters of the formula are given. The analysis shows that the model is in good agreement with the experimental curve and can reflect the characteristics of the strength of jointed rock mass with the parameters of joints, and it is reasonable to some extent.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)（北京）
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU45

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