纵向增强体土石坝设计理论在方田坝水库中的应用

基于工程实践,提出一种新坝型——纵向增强体土石坝。该坝型以常规土石坝为依托,在其内部建造集防渗与受力为一体的混凝土刚性结构体(纵向增强体),使其成为"刚柔相济"的坝工结构。在进行变形分析计算时,理论上将此纵向增强体作为竖向固端梁,考虑其承受上、下游水荷载与坝体堆石的作用力,特别是堆石沉降引起的纵向增强体表层的下拉荷载作用,同时考虑到纵向增强体在坝体中分割了上、下游坝壳料连续的应力应变关系,在各种工况下的力学表现更接近于挡土墙作用。根据提出的"纵向增强体土石坝"设计计算方法,结合工程实践,重点介绍纵向增强体土石坝在四川通江方田坝水库设计中的应用。

Application of the designing principle and method of longitudinal reinforced rockfill dam in Fangtianba Reservoir

Based on engineering practice, this paper proposed a new type of dam, longitudinal reinforced rockfill dam, which is built by a rigid structure(longitudinal reinforced body)with the functions of anti-seepage and bearing stress in the interior of conventional earth and rock dam. This rigid and flexible dam structure improves the operational safety of conventional earth and rock dam. In the analysis of deformation, it is theoretically deduced to consider it as a vertical fixed-end beam that bears the load of upstream and downstream water pressures as well as the force of rock-fill dam, especially the tensile load on the surface of the longitudinal reinforcement caused by the rock-fill settlement. At the same time, the longitudinal reinforcement split the continuous stress and strain of the dam shell material in the upstream and downstream of dam body, and the mechanical performance under various working conditions is closer to the behavior of retaining wall. According to the proposed designing and calculation method of the longitudinal reinforced earth and rockfill dam as well as the engineering practice, this paper mainly introduced the application of the proposed new type of dam in the design of the Fangtianba Reservoir in Tongjiang, Sichuan Province.