Dynamic responses of calcareous foundation reinforced by microbially induced calcite precipitation
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摘要: 微生物加固技术是一种有效提高土体强度、抑制土体发生液化破坏的绿色环保加固技术。采用温控微生物加固法对南海钙质砂地基模型进行微生物加固处理，并开展了一系列模型振动台试验研究，系统讨论了微生物加固程度和土体深度对微生物加固钙质砂地基的动应力应变关系、剪切模量、剪切波速以及动强度等动力特性的影响。试验研究表明微生物加固对钙质砂地基的动力学特性影响十分显著，具体表现在：随着微生物加固程度的提高，动剪应变显著降低，滞回圈骨干曲线的斜率逐渐增大，滞回圈面积和土体能量的耗散逐渐减小；动剪切模量随着加固程度的提高而增大，但增大幅度逐渐降低；深部土体的剪切模量衰减要高于上部土体；剪切波速值随着微生物加固程度的提高而显著提高，振动后的土体剪切波速值要高于振动前。动三轴试验获得的统一动强度方程，通过折减系数进行修正处理，可在一定程度上模拟振动台试验所获得的微生物加固钙质砂动强度发展规律。Abstract: The microbially induced calcite precipitation (MICP) is a green and ecofriendly technique to efficiently improve soil strength and mitigate liquefaction potential of soil. In this study, the temperature-controlled MICP method is used to reinforce the foundation model made with the calcareous sand from the South China Sea. A series of shaking table tests are performed to investigate the effects of biocementation level and soil depth on the dynamic stress-strain relationship, shear modulus, shear wave velocity and dynamic strength of the MICP-treated calcareous sand foundation. The test results show that the MICP can affect the dynamic response of the calcareous sand foundation significantly, indicating that with the increase of the biotreatment level, the dynamic shear strain decreases significantly; the area of stress-strain hysteresis ring and the energy dissipation decrease; the dynamic shear modulus increases with the decrease of increment amplitude; the shear modulus degradation at a larger depth is higher than that at a lower depth. The shear wave velocity increases with the biocementation level and becomes higher after shaking. The dynamic strength equation for the biotreated soil models from the triaxial cyclic loading tests, multiplying a reduction coefficient, can be used to simulate the dynamic soil strength of the MICP-treated calcareous sand foundation in the shaking table tests.
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Keywords:
- biotreatment /
- calcareous sand /
- dynamic response /
- dynamic strength /
- shaking table test
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全球性的气候问题与突发自然灾害使得岩土及地下工程灾变问题不断凸现，给岩土工程安全与运营构成巨大挑战。岩土体作为地球表面最为广泛存在的地质材料具有复杂的物理力学特性与显著的时空变异性。岩土工程物理模拟试验技术通过融合多学科知识模拟和再现岩土体在自然与工程状态下的物理力学行为，为复杂岩土工程问题的解决提供强力支撑。“交通强国”等重大国家战略的实施也给岩土工程带来了巨大的历史机遇。岩土工程防灾减灾问题由于其普遍性、迫切性和前沿性也成为岩土及地下工程领域研究的新热点。随着科技的进步，岩土工程物理模拟试验技术也正从传统的重力场模拟、离心试验，向数字与智能化转变，而世界级超大型试验设备的建设，更将极大驱动我国岩土工程物理模拟试验技术的未来发展。
为促进我国岩土工程物理模拟试验技术学术交流，由中国水利学会岩土力学专业委员会和中国土木工程学会土力学及岩土工程分会共同主办，交通运输部天津水运工程科学研究院、南京水利科学研究院、中交天津港湾工程研究院有限公司以及天津大学承办的第十届岩土工程物理模拟学术研讨会于2024年8月在天津市滨海新区举行。本届会议是继武汉(2011年)、杭州(2013)、北京(2017)、喀什(2023)会议后全国岩土工程物理模拟试验技术领域的又一次学术盛会。会议筹备期间共收到投稿论文113篇，经过审稿委员会的审议向《岩土工程学报》（增刊）推荐稿件51篇，并在学报2024年增刊1专刊出版。同时，本届研讨会举办了砂土场地桩基水平承载力平行试验，并以特邀报告、主题报告、青年学者报告等在内的形式开展广泛深入的交流，展现最新模拟技术和研究成果，探讨岩土工程物理模拟试验技术在交通强国基础设施建设与防灾减灾研究中的应用，以促进岩土工程物理模拟试验技术对我国重大战略和重大工程的技术支撑作用。
感谢对本届会议召开鼎力相助的交通运输部天津水运工程科学研究院及各有关单位，感谢向本届会议投稿的各位专家和同行，感谢审稿专家对本次会议审稿工作的辛勤付出。尤其是《岩土工程学报》编辑部，为使本届会议的论文集面世，做了大量工作，专门编辑出版了本期增刊，特此表示感谢。
第十届全国岩土工程物理模拟学术研讨会组委会 -
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图 1 滤波频率对应力应变关系曲线的影响
Figure 1. Effects of filter frequency on stress-strain hysteresis loops
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图 2 不同微生物加固程度对应力应变关系曲线的影响
Figure 2. Effects of biotreated level on dynamic stress-strain relation
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图 3 不同微生物加固程度模型地基在不同深度动剪应力-应变关系
Figure 3. Dynamic shear stress-strain relation of ground models with different biotreated levels at different depths
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图 4 不同微生物加固程度模型地基剪切模量衰减规律
Figure 4. Degradation of shear modulus for ground models with different biotreatments
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图 6 不同微生物加固程度模型地基在不同深度处剪切模量衰减规律
Figure 6. Degradation of shear modulus for ground models with different biotreated levels at different depths
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图 7 不同微生物加固程度模型地基剪切波速变化规律
Figure 7. Evolution of shear wave velocity for ground models with different biotreatment levels
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图 8 不同微生物加固程度模型地基CSR-Nf关系
Figure 8. Relationship between CSR and Nf for bio-ground models with different biotreated levels
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