If provided with high pressure pump and water gun , it can make up a hydraulic mechanized earth work unit , used for ground leveling , dredging in rivers and pools , digging , excavation and transportation in small hydraulic engineering , as well as the air defense and underground project in cities 若与高压水泵，水枪配合，组成水力机械化土方工程机组，就可用作于土地平整，河道与池塘的疏浚、凿开等小型水力工程的挖方与输方，以及城市的防空工程，地下工程。
Even if the proposed tunnel option is shown to be not causing any significant impacts to the long valley ecosystems , this is only a temporary relief to long valley which however is still unprotected and can be destroyed by legitimate land use changes e . g . , dry agriculture use under the existing agriculture use zone 纵使建议的隧道钻挖方案证实不会对?原生态系统造成严重的影响， ?原亦只是暂且逃过一劫，尚未得到正式的保护，随时会因?原属于农业用途用地，而遭合法的土地用途改变如乾耕农地破坏。
With synthesize slope ratio increasing , the stability of cutting slopes decreases , but the stability of sharpen slope affected by natural slopes ratio changes rarely , the stability of cutting slope that height is 30m is change notably due to slope type , whose single slope ratio with madao is inferior to the slope that upper ratio is less than lower ratio with platform in middle part . but the stability of cutting slope with 50m height is little change with the slope type change . with same stratum , slope height , slope type , the cutting slope is inferior to the sharpen slope in stability 结果表明，地层含水量在12 . 0 18 . 0变化范围内，各种挖方边坡稳定性均随湿度的增大而显著降低；路堑边坡的稳定性随综合坡比的增大而降低，但削坡受自然坡比影响，随综合坡比的增大其稳定性基本不变；坡高30m的路堑边坡稳定性因坡型改变而有明显变化，且单一坡比多级马道型边坡的稳定性较上缓下陡平台型边坡的稳定性差，但坡高50m的路堑边坡稳定性因坡型变化而基本不变；当坡高、坡型、地层条件相同时，路堑边坡的稳定性较削坡的稳定性差。
The paper points out the factor of safety by means of finite element method , the strength reduction method and limit equilibrium method decreases in turn . according to analysis of the strength reduction method , the stability of the cutting slope is less than the stability of nature slope . according to the results by the finite element method , the factor of safety calculated by axial loading stress - strain model is less than the factor of safety by lateral unloading stress - strain model 表明有限元法、强度折减法、极限平衡法得出的安全系数依次降低；依据强度折减法分析，相同条件下，挖方边坡的安全系数较自然边坡的安全系数小；依据有限元西安理工大学硕士学位论文法分析，轴向加荷应力路径模型确定的安全系数较围压卸荷应力路径模型确定的安全系数小。
The research findings solved the difficult problem of project , the test is first to study xigeda strata use to roadbed carrier , nearly millions xigeda strata can use in build , save investment and reduce occupation land , accelerate build speed , fill - up void that the xigeda strata use expressway filling material 仁述成果解决j一工程急需的问题，沿线近百力方的昔格达挖方可直接应用于西攀高速公路建设，同时也可以填补著名的易滑地层?昔格达地层用于高速公路路堤的空白，它可以节省投资，少占农业用地，加快工程建设，对于西攀高速公路的早日建成具有重要意义。
Secondly , on the basis of mechanic properties analysis , applying the stress - strain model of lateral unloading which can reflect the decrease change of principal stress state in the excavation progress of slope , dividing excavations slope into cutting slope and sharpen slope , numerical simulation is respectively carried through in order to analyze the impact of changing of slope type , slope height and stratum water content on the slope stability 其次，在试验研究的基础上，应用能够反映黄土挖方边坡大、小主应力减小变化的围压卸荷剪切应力应变模型，将挖方边坡区分为路堑边坡和削坡，通过数值模拟开挖过程分析了坡高、坡型、坡比及地层含水量变化对边坡稳定性的影响。
First , considering the change of stress conditions in excavation slopes by means of triaxial equipment , the triaxial tests of three kinds of stress paths of q3 and q2 loess , including lateral unloading , keeping mean normal stress changeless and conventional axial loading , is carried out under different water content and consolidation stress conditions 本文就黄土挖方高边坡工程问题，首先在三轴仪上考虑边坡开挖过程应力条件的变化，进行了q _ 3 、 q _ 2黄土不同含水量条件下围压卸荷、等p剪切及轴向加载三种应力路径的试验。
