浙江省74省道南延段工程深挖路堑高边坡稳定性分析

发布时间：2018-06-23 02:03

本文选题：浙江省 + 省道　；参考：《浙江大学》2017年硕士论文

【摘要】：山区和丘陵地区的公路、铁路等交通工程建设常会遇到深埋高挖工程,从而形成人工高边坡。其中,深挖边坡的稳定性是道路工程建设期间及其后期运营中的一个重要地质安全问题。因此,对深挖路堑边坡进行稳定性分析具有重要的实际意义。论文以浙江省74省道南延段工程中深挖路堑K68+580～K69+080与K70+960～K71+500两段边坡为对象,根据现场地质测绘、勘探资料,通过室内岩土力学基本参数试验和边坡稳定性计算分析,从地质条件、控制性结构等方面分析了上述两处高边坡的稳定性,并提出对应的边坡加固措施。本文主要工作有以下几点:(1)根据查明的开挖路堑边坡地形地貌、地层岩性,岩体风化程度、结构面发育状况等情况,分析了工程中控制边坡稳定的结构面不利组合及其潜在失稳模式;(2)利用赤平投影方法对典型滑移式楔形体进行边坡稳定性定性分析和评价,并通过有限元分析验证其在深挖路堑中的适用性;(3)利用Mohr-Coulomb屈服准则,对深挖路堑高边坡进行有限元分析。(4)根据赤平投影方法得出的边坡稳定性及有限元计算结果,有针对性地提出K68+580～K69+080与K70+960～K71+500段深挖路堑边坡的支护处治方案,提出类似工程开挖坡率以及开挖深度选择方案,为类似工程设计施工提供指导。根据上述研究工作,主要取得了以下几方面的研究结论:(1)岩质边坡结构面对边坡失稳破坏起控制作用,赤平投影方法在深挖路堑中具有适用性;(2)弹性模量E、泊松比v对边坡安全系数的影响不大;剪胀角φ对计算结果影响较大,计算过程中应考虑这个因素;深挖路堑边坡的安全系数随着坡高的增加而下降,而且安全系数的下降程度由快到慢,逐渐变缓、梯度逐渐减小,并且这条曲线非常近似于双曲线;随着坡角的增加,安全系数逐渐下降,且下降的梯度也是逐渐减小;(3)针对浙江区域类似边坡案例,提出严格控制开挖台阶高度及边坡坡率的建议,以控制边坡稳定。
[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.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.14

【参考文献】