The rule of destruction and deformation is controlled by the structure of rock mass , and the deformation and destruction of rock mass cannot be decided by the criteria of general materials 其破壞規(guī)律很大程度上受巖體結(jié)構(gòu)制約。同樣,其變形也受巖體結(jié)構(gòu)控制,其變形和破壞不能簡(jiǎn)單地用一般材料的變形規(guī)律和失穩(wěn)判據(jù)來(lái)判斷。
Numerous examples of rock mass engineering indicate that the deformation and breaking law of rock mass depends on its structural characteristics and the stability of rock mass construction is controlled by the very structure of rock mass 大量的巖體工程實(shí)例表明:巖體的變形和破壞規(guī)律取決于巖體的結(jié)構(gòu)特性,巖體工程的穩(wěn)定狀態(tài)受巖體自身結(jié)構(gòu)控制。
Based on the simplified structure of rock mass , three - dimensional finite element numerical modeling technique is used to analyze systematically the distribution features of filed , strain field and plastic zone in the surrounding rock mass of the underground cavities after the excavation 在巖體結(jié)構(gòu)模型概化的基礎(chǔ)上,采有三維有限元數(shù)值分析方法,系統(tǒng)研究了大跨度、高邊墻地下洞室群開(kāi)挖完成后圍巖的二次應(yīng)力場(chǎng)、變形場(chǎng)和塑性破壞區(qū)的變化特征。
The mechanical genesis of the complicated rock mass is because several times of tectonism in pro - period made the structure of rock mass in the right dam foundation damaged seriously and rock mass alteration made its mechanical character more anisotropy . after that the fractures in the right dam foundation slope were stretched at the beginning of the quaternary period because in the period yakouhoushan mountain quaquaversal dome was blowups quickly . at the same time , the valley trenching of lancang river reach to 800 - 1000 meter in altitude at the right bank in nuozadu dam site 導(dǎo)致右岸巖體復(fù)雜化的成因是,右岸巖體在早期遭受了多期構(gòu)造作用和巖體蝕變的基礎(chǔ)上,第四紀(jì)早期丫口后山穹隆的快速隆起與當(dāng)時(shí)河谷下切至800m 1000m高程這一特殊因素組合引起了右岸巖體沿原有的斷裂(裂隙)張開(kāi),使地下水等風(fēng)化營(yíng)力能夠到達(dá)坡體較深部位,經(jīng)過(guò)長(zhǎng)期的風(fēng)化卸荷作用,形成了右岸復(fù)雜巖體。
Based on the simplified structure of rock mass , flac ( superscript 3d ) numerical modeling technique is used to systematically analyze the distribution features of the secondary stress field , strain field and plastic zones in the surrounding rock mass of the underground cavities after the excavation 摘要在巖體結(jié)構(gòu)模型概化的基礎(chǔ)上,采用flac (上標(biāo)3d )數(shù)值分析方法,系統(tǒng)研究了瀾滄江某大型水電站大跨度、高邊墻地下洞室群開(kāi)挖完成后圍巖的二次應(yīng)力場(chǎng)、變形場(chǎng)和塑性破壞區(qū)的變化特征。
Stability of rock slopes is generally controlled by the structure of rock masses , especially the soft structure surfaces . analysis of rock mass structures is a key to establish geological models and numerical simulation and a foundation to assess the stability of rock slopes . the weak structure surfaces are mainly bedding planes , faults , joints , schistosity plane and contact zones of intrusive bodies . since they are different in genesis and scale , the rock masses are different in features and mechanical intensities . based on the combination of rock structure bodies , 15 basic modes of deformation and failure of rock slope are systematically summarized . the deformation and failure of rock masses actually result from the recombination and rearrangement of these rock bodies . there are 11 types of rock mass structures and various deformation and failure of bank slopes are present in the reservoir area of the three gorge project 巖體結(jié)構(gòu),特別是軟弱結(jié)構(gòu)面對(duì)基巖斜坡變形與破壞具有顯著的控制作用,巖體結(jié)構(gòu)模式分析是建立斜坡地質(zhì)模型和數(shù)學(xué)模型的關(guān)鍵和評(píng)價(jià)斜坡穩(wěn)定性的基礎(chǔ)。巖層層面斷裂構(gòu)造節(jié)理裂隙片理與劈理以及侵入體和圍巖的接觸帶等是控制基巖斜坡穩(wěn)定的軟弱結(jié)構(gòu)面,這些成因不同大小不一的結(jié)構(gòu)面將巖體分割成性質(zhì)各異力學(xué)強(qiáng)度不均的各種巖體結(jié)構(gòu)體,構(gòu)成了15種基巖斜坡變形破壞的巖體結(jié)構(gòu)基本模式。不同結(jié)構(gòu)體的重新組合與排列是斜坡失穩(wěn)的內(nèi)在原因。
According to the research results of the rock quality calculation , the columnar section digitlizing , the rock mass structure diagnosis and other methods this paper used engineering limited parameters , basic structure and evolutionary structure of rock mass as the first grade indexes , proposed the technique of dynamic engineering classification of stability of mine road surrounding rock mass ? dec ? , pointed out the method of using dec results 基于圍巖質(zhì)量計(jì)算、柱狀圖數(shù)字化與重組、圍巖結(jié)構(gòu)診斷、采動(dòng)應(yīng)力作用后圍巖結(jié)構(gòu)演化等研究成果,采用工程要求、基本結(jié)構(gòu)、演化結(jié)構(gòu)”為一級(jí)指標(biāo),提出了巷道圍巖穩(wěn)定性動(dòng)態(tài)工程分類(lèi)技術(shù)、分類(lèi)結(jié)構(gòu)的表達(dá)技術(shù)及分類(lèi)結(jié)果的應(yīng)用方法