瀑布沟大坝砾石土心墙施工期拱效应监测分析

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摘要施工期高堆石坝心墙内部出现过高的拱效应，容易使蓄水期大坝发生水力劈裂而引起集中渗漏，分析评价高心墙坝施工期拱效应特征，对后期蓄水进度以及后续的国内高心墙坝建设具有指导性意义。以瀑布沟大坝施工期砾石土心墙应力监测资料为基础，结合实际变形监测资料，从实际施工过程和现场填筑进度出发，分别分析时间和空间对砾石土心墙施工期拱效应特征，发现施工期拱效应是伴随填筑和固结的发展而逐渐表现出来的，随着填筑高程的增加和时间的推移，拱效应越明显；心墙拱效应最强烈的部位在1/3坝高上下；除了心墙和砂壳两种介质接触面附近，心墙坝轴线处也表现出较强的拱效应。为降低心墙施工期拱效应，填筑过程中上下游坝壳应常洒水，并尽量保持心墙填筑高程略高于坝壳，河谷部位填筑高程略高于岸坡附近。

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关键词 ：水电工程, 瀑布沟大坝, 砾石土心墙, 竖向土压力, 拱效应, 水力劈裂, 监测

Abstract：Excessive arching existing in the high rockfill dam corewall during construction period，is inclined to produce the hydraulic fracturing and concentrated leakage consequently during the storage period. Therefore，the analysis and evaluation of the arching characteristics of high corewall rockfill dam during construction period，is of high-guiding significance to the progress of following storage and the consequently construction of higher rockfill dam corewall in domestic. Based on the stress monitoring data of gravelly soil corewall in Pubugou dam during construction period，and combined with the practical deformation monitoring data，using the actual construction process and field building procedure，the arching in gravelly soil corewall have been analyzed during construction period in time and space scale respectively. Analysis found that：arching during construction period is gradually shown with the accompany of the construction and consolidation progress. With the increasing of dam height and the passing of time，the arching is more and move obvious. The strongest arching of corewall occurs in the 1/3 height of dam. Except the vicinity of contact surface between core and shell，the place near the dam axis also have strong arching. To reduce the arching during construction period，the upstream and downstream dam shell should always being watered，and the height of corewall should be kept slightly higher than the dam shell，and the valley higher than the slope.

Key words： hydropower engineering Pubugou dam gravelly soil corewall soil pressure arching effect hydraulic fracturing monitoring

收稿日期: 2010-12-17

引用本文:

陈向浩1，邓建辉1，李鹏2，柯虎3. 瀑布沟大坝砾石土心墙施工期拱效应监测分析[J]. 岩石力学与工程学报, 2011, 30(S2): 3763-3770.
CHEN Xianghao1，DENG Jianhui1，LI Peng2，KE Hu3. ARCHING MONITORING AND ANALYSIS OF GRAVELLY SOIL COREWALL IN PUBUGOU DAM DURING CONSTRUCTION PERIOD. , 2011, 30(S2): 3763-3770.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS2/3763

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