大漂石砂砾石层台阶式防渗墙分层分段快速成墙工艺探析

Analysis of the Rapid Wall Construction Technology of the Step-type Seepage-proof Wall with Large Drift Stone and Gravel Layer

摘要

在深厚覆盖层与强透水河床条件下，坝基防渗常被大漂石、粗砂与卵砾石的随机堆积所制约，成槽易偏斜、槽壁易失稳，并伴随泥浆漏失与接头成型困难等问题。工程上多采用台阶式布置，使防渗墙在不同埋深区段形成逐级过渡，兼顾嵌岩深度与施工可达性，再配合分层分段的快速成墙组织，把“先破碎后抓取、先稳壁后浇筑”的节奏固化到各道工序。本文结合中国水利水电工程常见装备与现场控制经验，从台阶式防渗墙内涵、分层分段成槽、护壁与浇筑协同等角度展开讨论。

Abstract

Under conditions of deep cover layers and highly permeable riverbeds, dam foundation seepage prevention is often constrained by the random accumulation of large boulders, coarse sand, and gravel. This leads to easy deviation of the slot formation, instability of the slot walls, and issues such as slurry leakage and difficulty in joint formation. In engineering practice, a stepped arrangement is commonly adopted to create a gradual transition of the seepage prevention wall at different burial depths, balancing the depth of rock embedding and construction accessibility. Combined with a rapid wall-forming organization in layers and sections, the rhythm of “first breaking, then grabbing; first stabilizing the wall, then pouring” is solidified into each process. This paper discusses the stepped seepage prevention wall from the perspectives of its connotation, layered and sectional slot formation, and the coordination of wall protection and pouring, based on the common equipment and field control experience of China’s water conservancy and hydropower projects.

关键词

水利水电工程 / 大漂石砂砾石层 / 台阶式防渗墙 / 分层分段 / 快速成墙工艺

Key words

Water Conservancy and Hydropower Engineering / Large Drift Stone and Gravel Layer / Step-type Seepage Retaining Wall / Layered and Segmented Construction / Rapid Wall-forming Technology

参考文献

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