Tangent modulus method based on in-situ pressuremeter tests and its preliminary validation
WEN Yong1, 2, 3, YANG Guang-hua2, 3, 4, TANG Lian-sheng1, LI Zhi-yun4, HUANG Zhi-xing4, ZHANG Yu-cheng2, 3
1. School of Earth Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; 2. Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, China; 3. Geotechnical Engineering Technology Center of Guangdong Province, Guangzhou 510610, China; 4. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China
Abstract：The tangent modulus method is a method which is based on the plate loading tests to obtain the tangent modulus of the soil under different load levels, and uses the tangent modulus into the layer-wise summation method for calculating foundation settlement. It is one of the best methods for settlement calculations at present, which can overcome the adverse effects of sampling disturbance and reflect the nonlinearity of foundation settlement. However, the deficiency of the tangent modulus method based on the plate loading tests is that the plate loading tests need a heavy workload and cannot reflect the characteristics of soil in deep layers. While, compared with the plate loading tests, the pressuremeter tests take the advantages of simple operation and can test the soil with different depths, which can be said as simple and practical in-situ tests. Therefore, in order to further develop the tangent modulus method, one method in which the pressuremeter tests are used to obtain the parameters of the tangent modulus method is studied, and its feasibility is verified by the results of four plate loading tests with different sizes, which are tested in one fines sand foundation of Texas A&M University riverside campus. The results show that the calculated results of settlement curve of four plate loading tests with different sizes agree with the experimental ones, which preliminarily verifies the feasibility of the tangent modulus method based on the in-situ pressuremeter tests.
温勇,杨光华,汤连生,李志云,黄致兴,张玉成. 基于原位旁压试验的切线模量法及其初步验证[J]. 岩土工程学报, 2017, 39(s1): 121-125.
WEN Yong, YANG Guang-hua, TANG Lian-sheng, LI Zhi-yun, HUANG Zhi-xing, ZHANG Yu-cheng. Tangent modulus method based on in-situ pressuremeter tests and its preliminary validation. Chinese J. Geot. Eng., 2017, 39(s1): 121-125.
[1] 杨光华. 基础非线性沉降的双曲线模型法[J]. 地基处理, 1997(1): 50-53. (YANG Guang-hua. The hyperbolic model for estimating nonlinear settlement of foundation[J]. Ground Improvement, 1997(1): 50-53. (in Chinese)) [2] 杨光华. 残积土上基础非线性沉降的双曲线模型的研究[C]// 第七届全国岩土力学数值分析与解析方法讨论会论文集. 大连, 2001: 168-171. (YANG Guang-hua. A study on hyperbolic model for estimating nonlinear settlement of foundation on residual soil[C]// Proceeding of the Seventh National Conference on Numerical Analytical Methods in Geomechanics, Dalian, P.R. China. Dalian, 2001: 168-171. (in Chinese)) [3] 杨光华. 软土地基非线性沉降计算的简化法[J]. 广东水利水电, 2001(1): 3-5. (YANG Guang-hua. The simplified nonlinear settlement computation method for soft foundation[J]. Guangdong Water Resources and Hydropower, 2001(1): 3-5. (in Chinese)) [4] 杨光华. 地基非线性沉降计算的原状土切线模量法[J]. 岩土工程学报, 2006, 28(1): 1927-1931. (YANG Guang-hua. Nonlinear settlement computation of the soil foundation with the undisturbed soil tangentmodulus method[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(11): 1927-1931. (in Chinese)) [5] 杨光华, 王鹏华, 乔有梁. 地基非线性沉降计算的原状土割线模量法[J]. 土木工程学报, 2007, 40(5): 49-52. (YANG Guang-hua, WANG Peng-hua, QIAO You-liang. An undisturbed-soil secant modulus method for calculation of nonlinear settlement of soil foundations[J]. China Civil Engineering Journal, 2007, 40(5): 49-52. (in Chinese)) [6] 杨光华. 地基沉降计算的新方法[J]. 岩石力学与工程学报, 2008(4): 679-686. (YANG Guang-hua. New computation method for soil foundation settlements[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2008(4): 679-686. (in Chinese)) [7] 彭长学, 杨光华. 软土e-p曲线确定的简易方法及在非线性沉降计算中的应用[J]. 岩土力学, 2008, 29(6): 1706-1710. (PENG Chang-xue, YANG Guang-hua. A simplified method for determining e-p curve of soft soil and its application to analyzing nonlinear settlement of foundation[J]. Rock and Soil Mechanics, 2008, 29(6): 1706-1710. (in Chinese)) [8] 杨光华, 王俊辉. 地基非线性沉降计算原状土切线模量法的推广和应用[J]. 岩土力学, 2011, 32(增刊1): 33-37. (YANG Guang-hua, WANG Jun-hui, Application of undisturbed soil tangent modulus method for computing nonlinear settlement of soil foundation[J]. Rock and Soil Mechanics, 2011, 32(S1): 33-37. (in Chinese)) [9] 杨光华. 地基沉降计算的新方法及其应用[M]. 北京: 科学出版社, 2013. (YANG Guang-hua. The new method to calculate the settlement of the foundation and its applications[M]. Beijing: Science Press, 2013. (in Chinese)) [10] BAGUELIN F, JEZEQUEL J F, SHIELDS D H. The pressuremeter and foundation engineering[M]. Clausthal: Trans-portaion Technical Publications, 1978. [11] HOULSBY G T, WITHERS N J. Analysis of the cone pressuremeter test in clay[J]. Géotechnique, 1988(38): 575-587. [12] 黄熙龄, 张世浩, 等. 旁压试验及黏性土变形模量的测定[C]// 第一届土力学及基础工程学术会议论文选集. 北京, 1964. (HUANG Xi-ning, ZHANG Shi-hao. The pressuremeter test and the test the deformation modulus of clayey soil[C]// The Selected papers of the first soil mechanics and foundation engineering academic meeting of China. Beijing, 1964. (in Chinese)) [13] 赵善锐. 旁压试验及其工程应用[M]. 成都: 西南交通大学出版社, 1987. (ZHAO San-rui. The pressuremeter test and its engineering application[M]. Chengdu: Southwest Jiaotong University Press, 1987. (in Chinese)) [14] 沈国荣. 旁压结果预估基础沉降和承载力[D]. 成都: 西南交通大学, 1987. (SHEN Guo-rong. Using the result of pressuremeter test to predict the settlement and bearing capacity[D]. Chengdu: Southwest Jiaotong University, 1987. (in Chinese)) [15] 王长科. 用旁压试验原位测定土的强度参数[J]. 勘察科学技术, 1992: 1-3. (WANG Chang-ke. The method of in-situ determination of the strength parameters of soil by using pressuremeter[J]. Site Investigation Science and Technology, 1992: 1-3. (in Chinese)) [16] 郝冬雪. 孔扩张理论研究及自钻式旁压试验数值分析[D]. 大连: 大连理工大学, 2008. (HAO Dong-xue. Study on cavity expansion theory and numerical analysis of self-boring pressuremeter test[D]. Dalian: Dalian University of Technology, 2008. (in Chinese)) [17] GB 50007—2011 建筑地基基础设计规范[S]. 2011. (GB 50007—2011 Code for design of building foundation[S]. 2011. (in Chinese)) [18] BRIAUD Jean-Louis. Predicted and measured behavior of five spread footings on sand[M]. USA: Jean-Louis Briaud, 1994. [19] ASTM_D_4719-00 Standard test method for prebored pressuremeter testing in soils[S]. 2000.
