万州区典型堆积层滑坡滑带土抗剪强度参数间关系研究

Relationship between Shear Strength Parameters of Typical Accumulational Landslides Slip Soil in Wanzhou District

滑坡抗剪强度参数主要有天然峰值强度、饱和峰值强度、天然残余强度和饱和残余强度4种,这4种强度之间的关系目前还研究甚少。为此,提出了以收集的万州区20个典型堆积层滑坡147组抗剪强度参数为基础,采用数学分析软件SPSS筛选饱和残余强度的影响因素,然后利用Excel分析饱和残余强度与其影响因素的相关关系,以此判断影响因素的函数形式,在此基础上采用多元非线性回归模型研究饱和残余强度与其他3种抗剪强度参数之间的关系式。最后以万州区典型堆积层滑坡——螺丝冲滑坡为例,将多元非线性回归模型的计算结果与多元线性回归模型计算结果及试验值进行对比分析。研究表明,多元非线性回归模型计算的相对误差在8%以内,而多元线性回归模型计算的相对误差在6.85%~23.88%之间,多元非线性回归模型精度更高。

The shear strength parameters of landslide mainly include natural peak strength, saturated peak strength, natural residual strength, and saturated residual strength, however there are very few studies focused on the relationships between these parameters. In this paper, the mathematical analysis software SPSS is firstly adopted to screen the influence factors of residual strength, and then the relationship be- tween saturated residual strength and its influence factors is analyzed by using Excel to judge the function forms of influencing factors, and at last the multivariate nonlinear regression model is applied to study the relationship between the saturated residual strength and other three shear strength parameters based on the 147 groups of shear strength parameters collected from twenty typical debris landslides in Wanzhou Dis- trict. This paper also takes a typical debris landslide, Luosichong landslide in Wanzhou District as a case study research. The multivariate nonlinear regression model calculation results, the multivariate linear models calculation result, and the test value are compared and analyzed. It is observed that the multivari- ate nonlinear regression model calculation error is less than 85, and multiple linear regession model cal- culation error is 6.85 %- 23.88 %, therefore the multivariate nonlinear regression model ts more accurate.