考虑滑床复合倾斜岩体综合地基系数的抗滑桩受力特征研究

发布时间：2019-01-27 07:55

【摘要】：在抗滑桩内力与变形计算中,当前理论分析多将滑床岩体等效成均质体或水平的非均质体,而三峡库区大部分滑床多为复合倾斜岩体。通过3DEC数值试验,研究了抗滑桩的有效影响范围与桩截面宽度、深度的关系,确定了抗滑桩有效影响范围的上、下限;利用面积等效,在桩的有效影响范围内提出了滑床复合倾斜岩体综合地基系数K_(Zi)的公式;推导了基于K_(Zi)的弹性抗滑桩嵌固段受力特征研究的计算公式并编写了MATLAB计算程序。以马家沟滑坡为例,采用等效法、水平层状地基系数法和基于K_(Zi)的计算方法分别进行了抗滑桩嵌固段内力、位移的计算。结果表明,基于K_(Zi)的计算方法与水平层状地基系数法相比,滑面处位移增大14.6%,内力相差较小;同时,基于K_(Zi)的计算方法根据滑动面处的位移反求桩顶的位移与现场监测位移较为接近,而利用传统方法计算位移偏小,设计偏于危险。该方法可为复合倾斜岩体地区的抗滑桩设计提供理论支撑。
[Abstract]:In the calculation of the internal force and deformation of the anti-slide pile, most of the sliding bed rock mass is equivalent to the homogeneous or horizontal heterogeneous body in the current theoretical analysis, while most of the sliding bed in the three Gorges Reservoir area is a composite inclined rock mass. Through the 3DEC numerical test, the relationship between the effective influence range of anti-slide pile and the width and depth of the pile section is studied, and the upper and lower limits of the effective influence range of the anti-slide pile are determined. Based on the area equivalence, the formula of comprehensive foundation coefficient K _ (Zi) of sliding bed composite inclined rock mass is put forward in the effective range of pile. The calculation formula of stress characteristics of elastic anti-slide pile fixed segment based on K _ (Zi) is deduced and the MATLAB calculation program is written. Taking Majiagou landslide as an example, the internal force and displacement of the fixed segment of the anti-slide pile are calculated by using the equivalent method, the horizontal layered foundation coefficient method and the calculation method based on K _ (Zi), respectively. The results show that the displacement of sliding surface increases 14.6 and the difference of internal force is smaller than that of horizontal layered foundation coefficient method based on K _ (Zi). At the same time, the calculation method based on K _ (Zi) is closer to the displacement of the pile top based on the displacement at the sliding surface, but the traditional method is used to calculate the displacement is smaller and the design is more dangerous. This method can provide theoretical support for the design of anti-slide pile in the area of composite inclined rock mass.
【作者单位】：中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金资助项目(No.41372310) 中国博士后科学基金项目(No.2015M570671)~~
【分类号】：TU473.1

【相似文献】