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(1 廣州市設(shè)計(jì)院集團(tuán)有限公司, 廣州 510620; 2 廣州建筑股份有限公司, 廣州 510030;3 廣州市建筑集團(tuán)有限公司, 廣州 510030; 4 廣州大學(xué)土木工程學(xué)院, 廣州 510006)

摘要: 降雨誘發(fā)滑坡是花崗巖殘積土地區(qū)主要地質(zhì)災(zāi)害之一。 為研究花崗巖殘積土邊坡在強(qiáng)降雨條件下的響應(yīng),在廣州市黃埔區(qū)選取了一典型非飽和花崗巖殘積土邊坡開展系列研究,包括現(xiàn)場(chǎng)雨量監(jiān)測(cè)、固結(jié)不排水三軸試驗(yàn)、濾紙法試驗(yàn)。 基于監(jiān)測(cè)數(shù)據(jù)與試驗(yàn)結(jié)果,研究風(fēng)化程度對(duì)抗剪強(qiáng)度及土-水特征曲線的影響規(guī)律,探究了當(dāng)?shù)夭煌涤旯r對(duì)現(xiàn)場(chǎng)邊坡穩(wěn)定的影響。 結(jié)果表明,隨著風(fēng)化程度加劇花崗巖殘積土有效抗剪強(qiáng)度指標(biāo)均有不同程度的減小,其中,風(fēng)化差異導(dǎo)致的有效內(nèi)摩擦角變化幅度小于有效黏聚力變化幅度;風(fēng)化程度差異也影響花崗巖殘積土的非飽和水力特性;降雨強(qiáng)度與邊坡安全系數(shù)的降幅呈正相關(guān)關(guān)系,而降雨歷時(shí)與邊坡安全系數(shù)的恢復(fù)速度呈負(fù)相關(guān)關(guān)系。 該研究可為典型花崗巖殘積土邊坡相關(guān)工程的科學(xué)設(shè)計(jì)與災(zāi)變防控提供一定借鑒。

關(guān)鍵詞: 花崗巖殘積土; 三軸試驗(yàn); 濾紙法; 強(qiáng)降雨; 邊坡穩(wěn)定性; 巖土風(fēng)化

中圖分類號(hào):TU398. 7 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)24-0138-06

DOI:10. 19701 / j. jzjg. ZJ220082

Study on unsaturated characteristics of granite residual soil and its slope stability

HUANG Junguang1,2,3, FAN Peiyan4, SHAN Yi4, LI Weike1,2,3, LI Lei1,2,3,4

(1 Guangzhou Design Institute Group Co. , Ltd. , Guangzhou 510620, China; 2 Guangzhou Construction Co. , Ltd. ,Guangzhou 510030, China; 3 Guangzhou Construction Group Co. , Ltd. , Guangzhou 510030, China; 4 School ofCivil Engineering, Guangzhou University, Guangzhou 510006, China)

Abstract: Rainfall-induced landslide is one of the significant geological hazards in granite residual soil areas. Toinvestigate the response of the granite residual soil slope to torrential rain, a series of studies which include in-situ rainfallmonitoring, consolidated undrained triaxial tests and filter paper method were conducted on a typical unsaturated graniteresidual soil slope located in Huangpu, Guangzhou. Based on the monitoring data and tests results, the influence law ofweathering degree on shear strength and soil-water characteristic curve was studied, and the effect of different local rainfallconditions on the site slope stability was gave insights into. The results show that as the weathering increases, the effectiveshear strength parameters of the granite residual soils decrease in different degrees, and the change range of effectiveinternal friction angle caused by weathering difference is smaller than that of effective cohesion. The unsaturated hydraulicproperties of granite residual soils are also affected by weathering difference. The decrease of slope safety factor is positivelycorrelated with the rainfall intensity, while the recovery rate of slope safety factor is negatively correlated with the rainfallduration. This study can provide some reference for scientific design and disaster prevention and control of typical graniteresidual soil slope related projects.

Keywords:granite residual soil; triaxial testing; filter paper method; torrential rain; slope stability; weathering of rock andsoil

∗國(guó)家自然科學(xué)基金(52008121),中國(guó)博士后科學(xué)基金(2020M682652),住房和城鄉(xiāng)建設(shè)部科學(xué)技術(shù)計(jì)劃項(xiàng)目(2022-K-039),廣東省住房和城鄉(xiāng)建設(shè)廳科技計(jì)劃項(xiàng)目( 2020-K5-144658),廣州市建筑集團(tuán)有限公司科技計(jì)劃項(xiàng)目( 2021-KJ013、2021-KJ039)。

第一作者:黃俊光,碩士,教授級(jí)高級(jí)工程師,注冊(cè)土木工程師(巖土),主要從事巖土工程設(shè)計(jì)工作,Email:hj020@ 126. com。

[引用本文] 黃俊光,范培彥,單毅,等. 花崗巖殘積土非飽和特性及其邊坡穩(wěn)定性研究[ J]. 建筑結(jié)構(gòu),2022,52(24):138-143. HUANG Junguang, FAN Peiyan, SHAN Yi,et al. Study on unsaturated characteristics of granite residualsoil and its slope stability[J]. Building Structure,2022,52(24):138-143.