陇南碎石土边坡上输电线路铁塔合理位置的确定

结合甘肃省陇南市某输电线路工程实例，分析了铁塔合理位置的影响因素，运用理正岩土计算软件，采用极限平衡分析法，计算碎石土坡在不同坡度和铁塔荷载下的安全系数。结果表明:在满足安全系数1.25时，天然状态下边坡的稳定坡度是39.3°；坡高从9 m增至11 m时，安全坡度从31.1°减至29.2°；坡高从11 m增至18 m时，安全坡度从29.2°增至39.2°；当坡高达到19 m时，铁塔对边坡的稳定性不产生影响，安全坡度达到天然状态的39.3°；当坡高

Determination of Reasonable Position of Transmission Line Iron Tower on Gravel Soil Slope in South Gansu

Based on the example of a power transmission line project in South Gansu, influencing factors of reasonable position of iron tower were analyzed. The Lizheng geotechnical calculation software and limit equilibrium analysis method were adopted to calculate the safety coefficient of gravel slope under different gradients and tower loads. The calculation results show that under the condition of safety coefficient of 1.25, the slope stable gradient is 39.3° in natural condition. When the height of slope was increased from 9 m to 11 m, the safe slope gradient was decreased from 31.1° to 29.2°. When the height of slope was increased from 11 m to 18 m, the safe slope gradient was increased from 29.2° to 39.2°. When the height of slope reached 19 m, the iron tower has no effect on slope stability, and the safe slope gradient reaches 39.3° in natural condition. When the slope is higher than 20 m, the influence of iron tower on the slope stability can be neglected. Under 200 kPa load, from the foot to top of the slope, the shear stress in the slope was increased 35.27%~93.10%, and on the top, the shear stress ratio can be increased to 122.20% maximally comparing with natural condition.