全风化花岗岩富水地层注浆治理研究与应用

来源期刊:中南大学学报(自然科学版)2019年第3期

论文作者:李召峰 齐延海 李术才 张庆松 杨磊 张健 林荣峰 王凯

文章页码:694 - 704

关键词:疏水降压技术;注浆模型试验;全风化花岗岩;富水地层;工程应用

Key words:hydrophobic depressurization; grouting model test; completely weathered granite; water-rich stratum; engineering application

摘    要:研究不同水压条件下疏水降压对全风化花岗岩富水地层注浆模拟加固效果的影响,分析1 MPa水压条件下土体中浆脉分布及被注试样抗压、抗崩解特性规律,并将研究结果应用于广西岑水高速均昌隧道地下工程建设中,建立基于地层密度、含水率、颗粒级配、富水区水压等信息特征的理想疏水降压判据。研究结果表明:在不同水压条件下,随着疏水降压的增大,注浆量增多,浆脉呈现由局部细小构型过渡到复杂分支-网络构型再到单一粗大或平行构型的分布特点;土体压密区试样的抗压强度及水稳特性均随着疏水降压的增大而增高,与疏水降压呈正相关关系;当疏水降压为30%时,分支-网络型浆脉对土体起到压密和骨架支撑双重挤密作用,大幅度提高压密区试样抗压强度及水稳特性的增长速率。

Abstract: The influences of hydrophobic pressure drop on the simulation reinforcement effect of water-rich strata of fully weathered granite under different water pressure conditions were studied. The distribution of the slurry veins, the compressive and anti-disintegration characteristics of the grouted samples were analyzed under water pressure of 1 MPa. Furthermore, the results were applied to Junchang tunnel of Censhui expressway in Guangxi, and the criterion of ideal hydrophobic depressurization based on stratum density, water content, grain grading and water pressure in rich water areas was established. The results show that, under different water pressures, the amount of grouting increases with the increase of hydrophobic depressurization. The slurry veins transform from local small configuration to complex branch-network configuration to single bulky or parallel configuration. The compressive strength and the water stability characteristics of the sample in the compacted area of the soil increase with the increase of the hydrophobic depressurization, which is positively correlated with the hydrophobic depressurization. When the hydrophobic depressurization is 30%, branch-network slurry veins have soil pressure and skeleton support double compaction effect on soil, the compressive strength and water stability properties of pressure area sample improve greatly.

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