| 基于岩体抗压强度折减的边坡稳定性分析方法 |
| |
| 引用本文： | 张文莲,孙晓云,陈勇,金申熠.基于岩体抗压强度折减的边坡稳定性分析方法[J].岩土力学,2022,43(Z2):607-615. |
| |
| 作者姓名： | 张文莲 孙晓云 陈勇 金申熠 |
| |
| 作者单位： | 1. 石家庄铁道大学 土木工程学院，河北 石家庄 050043；2. 石家庄铁道大学 电气与电子工程学院，河北 石家庄 050043；
3. 石家庄铁道大学 交通工程结构力学行为与系统安全国家重点实验室，河北 石家庄 050043 |
| |
| 基金项目： | 河北省自然科学基金（No.F2019210243） |
| |
| 摘 要： | 在岩体边坡稳定性分析方法中，基于非线性Hoek-Brown准则的强度折减法，存在折减方案不统一或计算太复杂等问题。针对这一问题，提出了一种基于岩体抗压强度的广义Hoek-Brown准则强度折减法，比直接折减材料参数，更能体现强度衰减的物理意义。方案以岩体单轴抗压强度作为折减依据，对岩石单轴抗压强度sci和反映岩体结构特征的参数组合sa（s、a 均为模型参数）进行同比折减，分析该方案下抗剪切强度和抗拉强度的折减比例，并基于平均抗剪强度定义安全系数。应用该方案，对两个经典边坡算例进行稳定性分析，将所得安全系数、临界滑动面与局部线性化强度折减法、极限平衡法进行对比。结果表明，对于两算例，本方法所得安全系数与其他两种方法结果接近，相对误差低于2%；在算例1中，本方法得到的临界滑动面位置与其他两种方法结果一致性很高；在算例2中，本方案滑动面位置更接近于局部线性化法，且能同时反映剪切和拉伸破坏。以上结果验证了本强度折减方案和安全系数定义法的可靠性和合理性。
|
| 关 键 词： | 强度折减法 边坡稳定性分析 广义Hoek-Brown准则 安全系数 临界滑动面 |
| 收稿时间： | 2021-01-29 |
| 修稿时间： | 2021-06-11 |
Slope stability analysis method based on compressive
strength reduction of rock mass |
| |
| ZHANG Wen-lian,SUN Xiao-yun,CHEN Yong,JIN Shen-yi.Slope stability analysis method based on compressive
strength reduction of rock mass[J].Rock and Soil Mechanics,2022,43(Z2):607-615. |
| |
| Authors: | ZHANG Wen-lian SUN Xiao-yun CHEN Yong JIN Shen-yi |
| |
| Institution: | 1. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; 2. School of Electrical and Electronic Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; 3. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China |
| |
| Abstract: | In the rock
slope stability analysis methods, the strength reduction method based on
nonlinear Hoek-Brown criterion has some problems, such as the disunity of
reduction schemes or the complexity of calculation. To solve this problem, a
generalized Hoek-Brown criterion strength reduction method based on the
compressive strength of rock mass is developed, which can better reflect the
physical significance of strength attenuation than the direct reduction of
material parameters. Based on the uniaxial compressive strength of rock mass,
the uniaxial compressive strength of intact rock sci and the parameters’ combination sa (s and a are empirical parameters of
rock mass) are reduced by the
same ratio, the reduction ratios of shear strength and the tensile strength are
analyzed, and the factor of safety is defined based on the average shear
strength. The proposed method is applied to the stability analysis of two
classical slope examples, and the factor of safety and critical sliding surface
obtained are compared with the local linearized strength reduction method and
the limit equilibrium method. The results show that the factor of safety obtained
by the proposed method is close to that obtained by the other two methods for
two examples, and the relative error is less than 2%. In example 1, the
location of the critical sliding surface obtained by the proposed method is in
good agreement with the results of the other two methods. In example 2, the
critical sliding surface of the proposed method is closer to that of the local
linearization method, and can reflect both shear and tensile failures. The
above results verify the reliability and rationality of the proposed strength
reduction scheme and the definition method for factor of safety. |
| |
| Keywords: | strength reduction method slope stability analysis generalized Hoek-Brown criterion factor of safety critical sliding surface |
|
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
