吉沙水电站工程施工区渣土抗剪强度试验研究  

Research on the Shearing Strength Test for the Residue Soil at the Engineering Construction Area of Jisha Hydropower Scheme

作　　者：和树华 和浩 柳小强[2] 陈奇伯[2] 

机构地区：[1]国电香格里拉发电有限公司,云南香格里拉674400 [2]西南林学院,云南昆明650224

出　　处：《亚热带水土保持》2010年第2期1-4,共4页Subtropical Soil and Water Conservation

基　　金：云南省应用基础研究计划面上项目(20070065M);西南林学院重点科研基金项目(200509Z)

摘　　要：在分析施工区渣土容重的基础上,用微型剪力仪对其抗剪强度进行了测定分析,结果显示:①弃渣堆积平台和运渣道路的渣土容重>开挖边坡>弃渣堆积边坡,其均值分别为1.85g/cm3、1.45g/cm3和1.05g/cm3,说明运渣道路经不断碾压,渣土密实,弃渣边坡的自然堆积渣土,疏松多孔。②随着堆积年限的不同,弃渣边坡抗剪强度的大小有显著差异,堆积3年的弃渣其抗剪强度>2年弃渣>1年弃渣;同一坡面不同堆积部位的弃渣,其渣土抗剪强度呈坡上<坡中<坡下的趋势。③渣土堆放时间越长,植被恢复程度越好,渣土抗剪强度就越大。④施工区不同类型植被覆盖下原生土壤的抗剪强度大小依次为:高山松林>灌木丛和草地>乔灌木混交林,分别为当年堆渣坡面的9.25、8.75、8.75和6.50倍,也是弃渣平均抗剪强度的1.68倍。On the basis of analysis on the bulk weight of the residue soil at the construction area, the analysis was conducted to the shearing strength by using the micro - shearing machine. The result shows that ： （ 1 ） the bulk weight of the residue soil at the residue stacking platform and residue transport access road 〉 excavation slope 〉 residue stacking side slope, with the mean value of 1.85g/cm^3, 1.45g/cm^3 and 1.05g/cm^3, respectively. It means that after the continuously rolling, residue soil on the access road for transporting the residue soil is dense, while the naturally stacked residue soil on the side slope is loose and porous; （2） followed with the different stacked years, the sheafing strength for different residue side slope has the great differences. The shearing strength for the residue stacked for three years 〉 that of two years 〉 that of one year. The shearing strengths for the residues at the different stacked positions on the same side slope appear the trend of upslope 〉 slope 〉 down - slope ; （ 3 ） The more time for the residue soil stack, the better recovery of vegetation with the better sheafing strength; （4） The sheafing strength of the primary soil ranked in as alpine pine forest 〉 shrub ＆ grassland 〉 mixed forest of trees and shrubs, that are 9.25, 8.75, 8.75 and 6.50 times of that of the residue stacking slope ; that is the 1.78 times of the average sheafing strength of the residue soil.

关 键 词：吉沙水电站 施工区 渣土容重 渣土抗剪强度 

分 类 号：TU432[建筑科学—岩土工程]