本文選題：浙江省 + 省道��； 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：山區(qū)和丘陵地區(qū)的公路、鐵路等交通工程建設(shè)常會遇到深埋高挖工程,從而形成人工高邊坡。其中,深挖邊坡的穩(wěn)定性是道路工程建設(shè)期間及其后期運營中的一個重要地質(zhì)安全問題。因此,對深挖路塹邊坡進(jìn)行穩(wěn)定性分析具有重要的實際意義。論文以浙江省74省道南延段工程中深挖路塹K68+580～K69+080與K70+960～K71+500兩段邊坡為對象,根據(jù)現(xiàn)場地質(zhì)測繪、勘探資料,通過室內(nèi)巖土力學(xué)基本參數(shù)試驗和邊坡穩(wěn)定性計算分析,從地質(zhì)條件、控制性結(jié)構(gòu)等方面分析了上述兩處高邊坡的穩(wěn)定性,并提出對應(yīng)的邊坡加固措施。本文主要工作有以下幾點:(1)根據(jù)查明的開挖路塹邊坡地形地貌、地層巖性,巖體風(fēng)化程度、結(jié)構(gòu)面發(fā)育狀況等情況,分析了工程中控制邊坡穩(wěn)定的結(jié)構(gòu)面不利組合及其潛在失穩(wěn)模式;(2)利用赤平投影方法對典型滑移式楔形體進(jìn)行邊坡穩(wěn)定性定性分析和評價,并通過有限元分析驗證其在深挖路塹中的適用性;(3)利用Mohr-Coulomb屈服準(zhǔn)則,對深挖路塹高邊坡進(jìn)行有限元分析。(4)根據(jù)赤平投影方法得出的邊坡穩(wěn)定性及有限元計算結(jié)果,有針對性地提出K68+580～K69+080與K70+960～K71+500段深挖路塹邊坡的支護(hù)處治方案,提出類似工程開挖坡率以及開挖深度選擇方案,為類似工程設(shè)計施工提供指導(dǎo)。根據(jù)上述研究工作,主要取得了以下幾方面的研究結(jié)論:(1)巖質(zhì)邊坡結(jié)構(gòu)面對邊坡失穩(wěn)破壞起控制作用,赤平投影方法在深挖路塹中具有適用性;(2)彈性模量E、泊松比v對邊坡安全系數(shù)的影響不大;剪脹角φ對計算結(jié)果影響較大,計算過程中應(yīng)考慮這個因素;深挖路塹邊坡的安全系數(shù)隨著坡高的增加而下降,而且安全系數(shù)的下降程度由快到慢,逐漸變緩、梯度逐漸減小,并且這條曲線非常近似于雙曲線;隨著坡角的增加,安全系數(shù)逐漸下降,且下降的梯度也是逐漸減小;(3)針對浙江區(qū)域類似邊坡案例,提出嚴(yán)格控制開挖臺階高度及邊坡坡率的建議,以控制邊坡穩(wěn)定。
[Abstract]:Highway, railway and other traffic projects in mountainous and hilly areas often encounter deep buried and high excavation projects, thus forming artificial high slopes. Among them, the stability of deep excavation slope is an important geological safety problem during the construction of road engineering and its later operation. Therefore, it is of great practical significance to analyze the stability of deep excavation cutting slope. This paper takes the slope of K68580K69080 and K70960K71,500 in the south extension of Provincial Highway 74 in Zhejiang Province as the object. According to the geological mapping and exploration data, the basic parameters test of rock and soil mechanics and the calculation and analysis of slope stability are carried out in the laboratory. The stability of the two high slopes mentioned above is analyzed from the aspects of geological conditions and controlling structures, and the corresponding reinforcement measures are put forward. The main work of this paper is as follows: (1) according to the topography and landform of excavated cutting slope, stratigraphic lithology, weathering degree of rock mass, development of structure plane, etc. This paper analyzes the unfavorable combination of structural plane and its potential instability mode for controlling slope stability in engineering. (2) the slope stability analysis and evaluation of typical sliding wedges are carried out by using the stereographic projection method. The applicability of the method in deep excavation cutting is verified by finite element analysis. (3) using Mohr-Coulomb yield criterion, the finite element analysis of deep excavation cutting high slope is carried out. (4) the slope stability and finite element calculation results are obtained according to the stereographic projection method. The support and treatment scheme of deep excavation cutting slope of K68580K69080 and K70960K71,500 section is put forward, and the selection scheme of excavation slope rate and excavation depth of similar engineering is put forward, which provides guidance for the design and construction of similar engineering. According to the above research work, the main conclusions are as follows: (1) the rock slope structure plays a controlling role in the failure of the slope. (2) the elastic modulus E and Poisson's ratio v have little influence on the slope safety factor, the shear expansion angle 蠁 has great influence on the calculation results, and this factor should be taken into account in the calculation. The safety factor of deep excavation cutting slope decreases with the increase of slope height, and the degree of safety factor decreases from fast to slow, and the gradient gradually decreases, and this curve is very similar to hyperbolic curve; with the increase of slope angle, The safety factor decreases gradually, and the gradient decreases gradually. (3) for similar slope cases in Zhejiang region, the suggestion of strictly controlling the excavation step height and slope ratio is put forward to control the slope stability.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U416.14

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