《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“采用硅胶稳定剂缓解离心模拟试验中的液化问题”

作者：Carolyn T. Conlee; Patricia M. Gallagher; Ross W. Boulanger; Ronnie Kamai
刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2012年11月，138卷第11期，1334–1345页
关键词：硅胶；液化；离心试验；桩基；剪应变
摘要：本文通过两个离心模型试验所得的试验结果评估了硅胶对缓解液化的有效性。由于硅胶本身的耐久性和具有随时间推移可增大土体强度能力而被选为一种土体稳定剂。为研究侧向扩展效应，选取一个斜向中央排水渠的粉质粘土斜坡，将其坐落在一个4.8m厚的可液化层上，即为离心模型。通过离心模型试验分别评估了未处理和分别用9%，5%，4%浓度（质量浓度）的硅胶稳定剂处理的松砂的响应。当离心加速度为15g时，模型基本加速度的水平峰值处于0.007到1.3g之间（原型）。结果表明：经过硅胶处理过的砂的侧向扩展和沉降都有所降低。对与硅胶处理或未处理的砂土，低应变下的剪切模量都是通过测量剪切波速度确定的。本文同时测定了不同振动水平时周期荷载作用下的滞后响应。离心试验结果表明：随着硅胶浓度的增加循环阻力比有所增加，然而循环剪应变却有所降低。

Centrifuge Modeling for Liquefaction Mitigation Using Colloidal Silica Stabilizer

Authors: Carolyn T. Conlee; Patricia M. Gallagher; Ross W. Boulanger; Ronnie Kamai
Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 138, Issue 11 (November 2012), 1334–1345
Key words: Colloidal silica; Liquefaction;Centrifuge testing;Shear strain
Abstract: This paper reports the results of two centrifuge tests that were conducted to evaluate the effectiveness of colloidal silica for liquefaction mitigation. Colloidal silica has been selected as a stabilizer material in soils because of its permanence and ability to increase the strength of soils over time. The centrifuge model geometry was selected to study the effects of lateral spreading in a 4.8-m-thick liquefiable layer overlain by a silty clay sloping toward a central channel. The centrifuge test evaluates the response of untreated loose sands versus loose sands treated with 9, 5, and 4% colloidal silica concentrations (by weight). The models were subjected to a series of peak horizontal base accelerations ranging from 0.007 up to 1.3g (prototype) with a testing centrifugal acceleration of 15g. The results show a reduction in both lateral spreading and settlement in colloidal silica–treated sands versus untreated sands. The shear modulus at low strains was determined from shear wave velocity measurements for the untreated and treated loose sands. The hysteretic response during cyclic loading was also determined for various levels of shaking. The results from the centrifuge tests show an increase in cyclic resistance ratios and a decrease in cyclic shear strains for increasing colloidal silica concentrations.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000703
翻译：孙庆雷；审核：安鹏