传递系数法在滑坡治理削坡方案设计中的应用

 削坡减载设计的关键在于何处削坡使得削坡方案最为经济而又达到预期稳定效果，在工程实践中，一般采用不平衡推力法计算滑坡条块的下滑力和剩余下滑力，依据剪出口剩余下滑力小于或等于0这一条件来搜索最优的削坡规模及位置，一般情况下计算工作量较大。针对此问题，利用传递系数法思想，引入剩余抗滑力概念，逆向计算各条块的剩余抗滑力，不需进行优化搜索即可根据剩余抗滑力得到最优条件下削坡规模及位置，概念简单，计算方便。计算过程概括如下：根据预期安全系数从最后一个条块出发，逆向计算各条块的剩余抗滑力，剩余抗滑力依次在条块间向上传递，当剩余抗滑力为负值时，下一轮计算取为0，直到算出所有条块的剩余抗滑力，剩余抗滑力为负值的条块即为应削坡的条块，条块剩余抗滑力的负值即为应消除的荷载。

APPLICATION OF TRANSFER COEFFICIENT METHOD TO SCHEME DESIGN OF LANDSLIDE TREATMENT WITH SLOPE CUTTING

Slope cutting is a traditional method in landslide treatment. The key issue of slope cutting project is to make it most economical and can maintain stability. In practical engineering，unbalanced thrust force method is used to calculate driving force and residual driving force of slope-sliding blocks，then the optimal dimension and location of slope cutting are searched under the condition that the quantity of the residual driving force of shear outlets of landslide is less than or equal to zero，but its computation is considerably tedious. In allusion to the problem，using the idea of transfer coefficient method，the concept of residual sliding resistance force is introduced and optimal dimension and location of slope cutting can be obtained only after residual sliding resistance force of slope-sliding blocks is calculated. This method doesn¢t need to carry out searching calculation. It is simple and convenient in calculation. The calculation process is as follows：based on the anticipated factor of safety，residual sliding resistance force is calculated inversely starting from the last slide block. The residual sliding resistance force is transferred upwards one by one between the blocks. When the residual sliding resistance force of a block is negative，let it be zero in the next calculation until residual sliding resistance forces of all blocks are achieved. If the residual sliding resistance force of some block is negative，the block is the one that needs to be removed and the quantity of the negative force is the load of the block which needs to be eliminated.