万州区典型堆积层滑坡滑带土抗剪强度参数间关系研究

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。

圆形悬臂式抗滑桩结合明洞式框架桥综合处治滑坡

通过对湘耒高速公路炮石岭地段地质资料的研究,剖析了滑坡产生的原因及过程,介绍了采用圆形悬臂式抗滑桩结合明洞式框架桥的方法,达到了彻底根治的效果。

抗滑桩在岩质滑坡治理中的分析研究

随着经济的快速发展,我国在土木工程建设、交通基础设施建设等方面取得了一定成就。但是,在实际的施工过程中,山体地质环境的复杂性,使得山体滑坡现象经常出现,为人们的生产生活带来了严重威胁。基于此,做好抗滑桩技术的研究工作,对于岩质滑坡治理工作有着重要的现实参考意义。在实际的施工过程中,抗滑桩中设置桩体的位置一直比较灵活,对于周围的岩质滑坡影响较小,应用范围相对比较广泛。本文将从岩质滑坡的影响因素及抗滑桩技术的基本原理等方面进行深入地分析和探讨,为相关的研究工作带来一定的参考建议。

铰接式矩阵护坡施工技术

针对传统的护坡技术受水流长期冲刷、淘蚀作用,易产生塌坡崩岸险情,预拼装矩阵连块空间区域受限,大型设备无法布置,垂直运输装配就位困难等难点,本文研究了一种新型铰链式矩阵护坡来提高其抗冲刷和抗滑坡的能力。通过室内试验、工艺试验和应用实践,提出了采用坡面平整、铺设土工布、放样排版、铺设基准块、人工穿钢丝绳逐块拼装的铰链式矩阵护坡施工方法,有效解决长缓坡铰链式矩阵护坡施工难题,并将其运用到实践工程中。实践表明铰链式矩阵护坡施工技术具有广阔的应用前景。

Influence of rainfall on skid resistance performance and driving safety conditions of asphalt pavements

To study the influence of rainfall on pavement skid-resistance performance and driving safety,the water film thickness(WFT)concept considering the longitudinal and transverse slopes of the pavement was utilized based on the total discharge formulation and turbulence theory of slope flow.Using experimental data measured using the British pendulum test under varying WFT levels,a model for calculating the skid resistance,namely the British pendulum number(BPN),was formulated and used to quantitatively evaluate the effects of rainfall intensity,transverse,and longitudinal slopes on the computed BPN.The study results reveal that skid resistance is linearly proportional to the pavement transverse slope and inversely proportional to the rainfall intensity and the pavement longitudinal slope.In particular,rainfall intensity,along with pavement texture depth,exhibited a significant impact on the tire-pavement friction and skid-resistance performance.The results further indicate that driving safety under wet weather is predominantly governed by skid resistance and visibility.The BPN and sideway force coefficient(SFC60)values for new asphalt pavements under different rainfall intensities are provided along with some modification to the stopping sight distance(SSD)criteria.Safe driving speed limits are also determined using a safe-driving model to develop the appropriate speed limit strategies.The overall study results provide some insights,methodology approach,and reference data for the evaluation of pavement skid-resistance performance and driving safety conditions under different pavement slopes and rainfall intensities.

Numerical Analysis of the Stability of Embankment Slope Reinforced with Piles

The effects of stabilizing piles on the stability of an embankment slope are analyzed by numerical simulation. The shear strength reduction method is used for the analysis, and the soil - pile interaction is simulated with zero-thickness elasto-plastic interface elements. Effects of pile spacing and pile position on the safety factor of slope and the behavior of piles under these conditions are given. The numerical analysis indicates that the positions of the pile have significant influence on the stability of the slope, and the pile needs to be installed in the middle of the slope for maximum safety factors. In the end, the soil arching effect closely associated with the space between stabilizing piles is analyzed. The results are helpful for design and construction of stabilizing piles.