边坡临界滑动场法改进与计算系统开发

发布时间：2018-05-01 17:25

本文选题：边坡稳定性 + 任意形状滑动面　；参考：《合肥工业大学》2016年博士论文

【摘要】：边坡临界滑动场法是目前确定任意形状临界滑动面最有效的方法之一。经过十余年的发展,边坡临界滑动场法已初步成为计算边坡稳定性的新方法,但其在水力、加固等复杂条件下的应用尚需进一步研究、完善。本文在已有研究成果的基础上,在不同水力条件及加固措施下对边坡临界滑动场计算方法进行改进,拓展其应用范围,使其成为理论严密、功能完善、通用性更强的边坡稳定分析新方法。同时,本文在课题组已有研究成果的基础上,开发了一款人机交互性能良好的边坡临界滑动场计算系统。本文完成的主要研究工作和成果总结如下:(1)水力条件下的边坡临界滑动场计算方法研究。针对邻水岸坡坡外水位变化及坡内非饱和-非稳定渗流的复杂情况,结合有限元渗流计算得到孔隙水压力场,并基于非饱和土的抗剪强度理论,对边坡临界滑动场进行改进,提出非饱和-非稳定渗流条件下的边坡临界滑动场计算方法;针对河岸崩塌问题的分析和研究,在考虑江河水位变化及坡内非稳定渗流基础上,同时考虑水流冲刷引起的河床冲深及河岸后退,提出了水流冲刷过程中的边坡临界滑动场计算方法,适用于天然江河崩岸的预测与模拟;针对具有较大张裂缝的边坡,在强降雨条件下雨水沿张裂缝入渗易积水形成静水压力而对边坡稳定不利的情况,结合降雨条件下饱和-非饱和渗流分析,考虑降雨过程中的瞬态孔隙水压力场与瞬态强度场,并同时考虑张裂缝充水时的静水压力,提出降雨条件下具有张裂缝的边坡临界滑动场计算方法,解决了张裂缝静水压力影响下的任意形状滑动面搜索问题。代表性算例及工程应用验证了水力条件下边坡临界滑动场计算方法的合理性及可靠性。(2)加固条件下的边坡临界滑动场计算方法研究。传统方法计算锚固力作用下边坡稳定性时,将锚固力作为集中力处理,针对锚固力传统处理方式下的边坡临界滑动场方法在搜索任意形状临界滑动面时会使得滑面发生突变,且得到的滑面正应力和条间力分布极不合理的问题,将半无限体受集中力作用的弹性力学近似解作为锚固力等效内力模型,提出了更为合理的锚固结构作用下的边坡临界滑动场计算方法;此外,针对确定加筋土边坡破裂面位置和形状这一难点,将加筋作用视为滑动面上的等效力,同时考虑力与力矩平衡,建立了基于严格法的加筋土边坡临界滑动场计算方法。通过典型算例及工程应用表明,加固措施会影响边坡临界滑动面的形状和位置,上述方法能够搜索到加固作用下更合理的临界滑动面,得到的安全系数也更合理、更可靠。(3)以面向对象的程序设计语言C#为开发工具,在Visual Studio 2013开发平台上,建立了边坡临界滑动场计算系统,并自带绘图功能,可通过绘图来建立边坡计算几何模型。通过4个典型算例与两个工程应用表明,本文边坡临界滑动场计算系统已具有较好的通用性,已具备分析工程实际中复杂边坡稳定性的能力,计算结果也合理可靠。
[Abstract]:The critical sliding field method of slope is one of the most effective methods to determine the critical sliding surface of arbitrary shape. After more than ten years of development, the slope critical sliding field method has already become a new method to calculate the stability of the slope. However, the application of the slope under the complex conditions such as hydraulic and reinforcement needs to be studied and perfected. On the basis of different hydraulic conditions and reinforcement measures, the slope critical sliding field calculation method is improved, and its application scope is expanded to make it a new method of slope stability analysis with strict theory, perfect function and more versatility. At the same time, on the basis of the existing research results of the project group, this paper has developed a good human-computer interaction. The main research work and achievements in this paper are summarized as follows: (1) study on the calculation method of critical sliding field of slope under hydraulic conditions. The pore water pressure field is obtained by combining the finite element seepage calculation for the complicated conditions of the water level outside the slope of the slope and the unsaturated seepage in the slope. In the theory of shear strength of unsaturated soil, the critical sliding field of slope is improved and the calculation method of critical sliding field of slope under unsaturated and unsteady seepage is put forward. The method of calculating the critical sliding field of the slope in the process of water erosion is put forward, which is suitable for the prediction and Simulation of the natural river bank. Considering the transient pore water pressure field and transient intensity field in the process of rainfall, and considering the hydrostatic pressure of the tensional crack at the same time, the calculation method of the critical sliding field with a crack under the rainfall condition is put forward to solve the search problem of the arbitrary shape sliding surface under the influence of the static water pressure under the influence of the tension crack. The rationality and reliability of the critical sliding field calculation method of slope under hydraulic conditions is verified by the example and engineering application. (2) study on the calculation method of critical sliding field of slope under reinforcement conditions. When the traditional method is used to calculate the stability of the slope under the anchor force, the anchoring force is treated as the concentrated force, and the edge of the traditional method of anchoring force is used. The slope critical sliding field method can make the slip surface abrupt when searching for the critical sliding surface of arbitrary shape, and the problem that the normal stress and the distribution of the force between the slider are extremely unreasonable. The elastic mechanics approximate solution of the semi infinite body under the action of the concentrated force is taken as the equivalent internal force model of the anchor force, and the more reasonable anchorage structure is proposed. In addition, in view of the difficulty of determining the position and shape of the fractured surface of the reinforced soil slope, the reinforcement effect is considered as the equal effect on the sliding surface, and the force and torque balance is considered, and the critical sliding field calculation method based on the strict method is established. The reinforcement of the critical sliding field based on the strict method is proved by the typical example and the engineering application. The measures will affect the shape and position of the critical sliding surface of the slope. The above method can search the more reasonable critical sliding surface under the reinforcement effect, and the safety factor is more reasonable and more reliable. (3) the calculation of the critical sliding field of the slope is established on the Visual Studio 2013 development platform with the object-oriented programming language C# as the development tool. The system, and with the drawing function, can establish the slope calculation geometric model by drawing. Through 4 typical examples and two engineering applications, it shows that the slope critical sliding field calculation system has good generality, and has the ability to analyze the stability of the complex slope in the engineering practice, and the calculation results are also reasonable and reliable.

【学位授予单位】：合肥工业大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TU43

【参考文献】